arthas-master

core/src/main/java/com/taobao/arthas/core/command/klass100/GetStaticCommand.java

+package com.taobao.arthas.core.command.klass100;
+
+import com.alibaba.arthas.deps.org.slf4j.Logger;
+import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
+import com.taobao.arthas.core.command.Constants;
+import com.taobao.arthas.core.command.express.ExpressException;
+import com.taobao.arthas.core.command.express.ExpressFactory;
+import com.taobao.arthas.core.command.model.ClassVO;
+import com.taobao.arthas.core.command.model.ClassLoaderVO;
+import com.taobao.arthas.core.command.model.GetStaticModel;
+import com.taobao.arthas.core.command.model.MessageModel;
+import com.taobao.arthas.core.command.model.RowAffectModel;
+import com.taobao.arthas.core.shell.command.AnnotatedCommand;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+import com.taobao.arthas.core.shell.command.ExitStatus;
+import com.taobao.arthas.core.util.ClassUtils;
+import com.taobao.arthas.core.util.ClassLoaderUtils;
+import com.taobao.arthas.core.util.CommandUtils;
+import com.taobao.arthas.core.util.SearchUtils;
+import com.taobao.arthas.core.util.StringUtils;
+import com.taobao.arthas.core.util.affect.RowAffect;
+import com.taobao.arthas.core.util.matcher.Matcher;
+import com.taobao.arthas.core.util.matcher.RegexMatcher;
+import com.taobao.arthas.core.util.matcher.WildcardMatcher;
+import com.taobao.middleware.cli.annotations.Argument;
+import com.taobao.middleware.cli.annotations.Description;
+import com.taobao.middleware.cli.annotations.Name;
+import com.taobao.middleware.cli.annotations.Option;
+import com.taobao.middleware.cli.annotations.Summary;
+
+import java.lang.instrument.Instrumentation;
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+import java.util.List;
+import java.util.Set;
+import java.util.Collection;
+
+/**
+ * @author diecui1202 on 2017/9/27.
+ */
+
+@Name("getstatic")
+@Summary("Show the static field of a class")
+@Description(Constants.EXAMPLE +
+             "  getstatic demo.MathGame random\n" +
+             "  getstatic -c 39eb305e org.apache.log4j.LogManager DEFAULT_CONFIGURATION_FILE\n" +
+             Constants.WIKI + Constants.WIKI_HOME + "getstatic")
+public class GetStaticCommand extends AnnotatedCommand {
+
+    private static final Logger logger = LoggerFactory.getLogger(GetStaticCommand.class);
+
+    private String classPattern;
+    private String fieldPattern;
+    private String express;
+    private String hashCode = null;
+    private String classLoaderClass;
+    private boolean isRegEx = false;
+    private int expand = 1;
+
+    @Argument(argName = "class-pattern", index = 0)
+    @Description("Class name pattern, use either '.' or '/' as separator")
+    public void setClassPattern(String classPattern) {
+        this.classPattern = classPattern;
+    }
+
+    @Argument(argName = "field-pattern", index = 1)
+    @Description("Field name pattern")
+    public void setFieldPattern(String fieldPattern) {
+        this.fieldPattern = fieldPattern;
+    }
+
+    @Argument(argName = "express", index = 2, required = false)
+    @Description("the content you want to watch, written by ognl")
+    public void setExpress(String express) {
+        this.express = express;
+    }
+
+    @Option(shortName = "c", longName = "classloader")
+    @Description("The hash code of the special class's classLoader")
+    public void setHashCode(String hashCode) {
+        this.hashCode = hashCode;
+    }
+
+    @Option(longName = "classLoaderClass")
+    @Description("The class name of the special class's classLoader.")
+    public void setClassLoaderClass(String classLoaderClass) {
+        this.classLoaderClass = classLoaderClass;
+    }
+
+    @Option(shortName = "E", longName = "regex", flag = true)
+    @Description("Enable regular expression to match (wildcard matching by default)")
+    public void setRegEx(boolean regEx) {
+        isRegEx = regEx;
+    }
+
+    @Option(shortName = "x", longName = "expand")
+    @Description("Expand level of object (1 by default)")
+    public void setExpand(Integer expand) {
+        this.expand = expand;
+    }
+
+    @Override
+    public void process(CommandProcess process) {
+        RowAffect affect = new RowAffect();
+        Instrumentation inst = process.session().getInstrumentation();
+
+        if (hashCode == null && classLoaderClass != null) {
+            List<ClassLoader> matchedClassLoaders = ClassLoaderUtils.getClassLoaderByClassName(inst, classLoaderClass);
+            if (matchedClassLoaders.size() == 1) {
+                hashCode = Integer.toHexString(matchedClassLoaders.get(0).hashCode());
+            } else if (matchedClassLoaders.size() > 1) {
+                Collection<ClassLoaderVO> classLoaderVOList = ClassUtils.createClassLoaderVOList(matchedClassLoaders);
+                GetStaticModel getStaticModel = new GetStaticModel()
+                        .setClassLoaderClass(classLoaderClass)
+                        .setMatchedClassLoaders(classLoaderVOList);
+                process.appendResult(getStaticModel);
+                process.end(-1, "Found more than one classloader by class name, please specify classloader with '-c <classloader hash>'");
+                return;
+            } else {
+                process.end(-1, "Can not find classloader by class name: " + classLoaderClass + ".");
+                return;
+            }
+        }
+
+        Set<Class<?>> matchedClasses = SearchUtils.searchClassOnly(inst, classPattern, isRegEx, hashCode);
+        try {
+            if (matchedClasses == null || matchedClasses.isEmpty()) {
+                process.end(-1, "No class found for: " + classPattern);
+                return;
+            }
+            ExitStatus status = null;
+            if (matchedClasses.size() > 1) {
+                status = processMatches(process, matchedClasses);
+            } else {
+                status = processExactMatch(process, affect, inst, matchedClasses);
+            }
+            process.appendResult(new RowAffectModel(affect));
+            CommandUtils.end(process, status);
+        } catch (Throwable e){
+            logger.error("processing error", e);
+            process.appendResult(new RowAffectModel(affect));
+            process.end(-1, "processing error");
+        }
+    }
+
+    private ExitStatus processExactMatch(CommandProcess process, RowAffect affect, Instrumentation inst,
+                                   Set<Class<?>> matchedClasses) {
+        Matcher<String> fieldNameMatcher = fieldNameMatcher();
+
+        Class<?> clazz = matchedClasses.iterator().next();
+
+        boolean found = false;
+
+        for (Field field : clazz.getDeclaredFields()) {
+            if (!Modifier.isStatic(field.getModifiers()) || !fieldNameMatcher.matching(field.getName())) {
+                continue;
+            }
+            if (!field.isAccessible()) {
+                field.setAccessible(true);
+            }
+            try {
+                Object value = field.get(null);
+
+                if (!StringUtils.isEmpty(express)) {
+                    value = ExpressFactory.threadLocalExpress(value).get(express);
+                }
+
+                process.appendResult(new GetStaticModel(field.getName(), value, expand));
+
+                affect.rCnt(1);
+            } catch (IllegalAccessException e) {
+                logger.warn("getstatic: failed to get static value, class: {}, field: {} ", clazz, field.getName(), e);
+                process.appendResult(new MessageModel("Failed to get static, exception message: " + e.getMessage()
+                              + ", please check $HOME/logs/arthas/arthas.log for more details. "));
+            } catch (ExpressException e) {
+                logger.warn("getstatic: failed to get express value, class: {}, field: {}, express: {}", clazz, field.getName(), express, e);
+                process.appendResult(new MessageModel("Failed to get static, exception message: " + e.getMessage()
+                              + ", please check $HOME/logs/arthas/arthas.log for more details. "));
+            } finally {
+                found = true;
+            }
+        }
+
+        if (!found) {
+            return ExitStatus.failure(-1, "getstatic: no matched static field was found");
+        } else {
+            return ExitStatus.success();
+        }
+    }
+
+    private ExitStatus processMatches(CommandProcess process, Set<Class<?>> matchedClasses) {
+
+//        Element usage = new LabelElement("getstatic -c <hashcode> " + classPattern + " " + fieldPattern).style(
+//                Decoration.bold.fg(Color.blue));
+//        process.write("\n Found more than one class for: " + classPattern + ", Please use " + RenderUtil.render(usage, process.width()));
+        //TODO support message style
+        String usage = "getstatic -c <hashcode> " + classPattern + " " + fieldPattern;
+        process.appendResult(new MessageModel("Found more than one class for: " + classPattern + ", Please use: "+usage));
+
+        List<ClassVO> matchedClassVOs = ClassUtils.createClassVOList(matchedClasses);
+        process.appendResult(new GetStaticModel(matchedClassVOs));
+        return ExitStatus.failure(-1, "Found more than one class for: " + classPattern + ", Please use: "+usage);
+    }
+
+    private Matcher<String> fieldNameMatcher() {
+        return isRegEx ? new RegexMatcher(fieldPattern) : new WildcardMatcher(fieldPattern);
+    }
+}

core/src/main/java/com/taobao/arthas/core/command/klass100/JadCommand.java

+package com.taobao.arthas.core.command.klass100;
+
+import com.alibaba.arthas.deps.org.slf4j.Logger;
+import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
+import com.taobao.arthas.common.Pair;
+import com.taobao.arthas.core.command.Constants;
+import com.taobao.arthas.core.command.model.ClassVO;
+import com.taobao.arthas.core.command.model.ClassLoaderVO;
+import com.taobao.arthas.core.command.model.JadModel;
+import com.taobao.arthas.core.command.model.MessageModel;
+import com.taobao.arthas.core.command.model.RowAffectModel;
+import com.taobao.arthas.core.shell.cli.Completion;
+import com.taobao.arthas.core.shell.cli.CompletionUtils;
+import com.taobao.arthas.core.shell.command.AnnotatedCommand;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+import com.taobao.arthas.core.shell.command.ExitStatus;
+import com.taobao.arthas.core.util.ClassUtils;
+import com.taobao.arthas.core.util.ClassLoaderUtils;
+import com.taobao.arthas.core.util.CommandUtils;
+import com.taobao.arthas.core.util.Decompiler;
+import com.taobao.arthas.core.util.InstrumentationUtils;
+import com.taobao.arthas.core.util.SearchUtils;
+import com.taobao.arthas.core.util.affect.RowAffect;
+import com.taobao.middleware.cli.annotations.Argument;
+import com.taobao.middleware.cli.annotations.DefaultValue;
+import com.taobao.middleware.cli.annotations.Description;
+import com.taobao.middleware.cli.annotations.Name;
+import com.taobao.middleware.cli.annotations.Option;
+import com.taobao.middleware.cli.annotations.Summary;
+
+import java.io.File;
+import java.lang.instrument.Instrumentation;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.NavigableMap;
+import java.util.Set;
+import java.util.Collection;
+import java.util.regex.Pattern;
+
+/**
+ * @author diecui1202 on 15/11/24.
+ * @author hengyunabc 2018-11-16
+ */
+@Name("jad")
+@Summary("Decompile class")
+@Description(Constants.EXAMPLE +
+        "  jad java.lang.String\n" +
+        "  jad java.lang.String toString\n" +
+        "  jad --source-only java.lang.String\n" +
+        "  jad -c 39eb305e org/apache/log4j/Logger\n" +
+        "  jad -c 39eb305e -E org\\\\.apache\\\\.*\\\\.StringUtils\n" +
+        Constants.WIKI + Constants.WIKI_HOME + "jad")
+public class JadCommand extends AnnotatedCommand {
+    private static final Logger logger = LoggerFactory.getLogger(JadCommand.class);
+    private static Pattern pattern = Pattern.compile("(?m)^/\\*\\s*\\*/\\s*$" + System.getProperty("line.separator"));
+
+    private String classPattern;
+    private String methodName;
+    private String code = null;
+    private String classLoaderClass;
+    private boolean isRegEx = false;
+    private boolean hideUnicode = false;
+    private boolean lineNumber;
+
+    /**
+     * jad output source code only
+     */
+    private boolean sourceOnly = false;
+
+    @Argument(argName = "class-pattern", index = 0)
+    @Description("Class name pattern, use either '.' or '/' as separator")
+    public void setClassPattern(String classPattern) {
+        this.classPattern = classPattern;
+    }
+
+    @Argument(argName = "method-name", index = 1, required = false)
+    @Description("method name pattern, decompile a specific method instead of the whole class")
+    public void setMethodName(String methodName) {
+        this.methodName = methodName;
+    }
+
+
+    @Option(shortName = "c", longName = "code")
+    @Description("The hash code of the special class's classLoader")
+    public void setCode(String code) {
+        this.code = code;
+    }
+
+    @Option(longName = "classLoaderClass")
+    @Description("The class name of the special class's classLoader.")
+    public void setClassLoaderClass(String classLoaderClass) {
+        this.classLoaderClass = classLoaderClass;
+    }
+
+    @Option(shortName = "E", longName = "regex", flag = true)
+    @Description("Enable regular expression to match (wildcard matching by default)")
+    public void setRegEx(boolean regEx) {
+        isRegEx = regEx;
+    }
+
+    @Option(longName = "hideUnicode", flag = true)
+    @Description("hide unicode, default value false")
+    public void setHideUnicode(boolean hideUnicode) {
+        this.hideUnicode = hideUnicode;
+    }
+
+    @Option(longName = "source-only", flag = true)
+    @Description("Output source code only")
+    public void setSourceOnly(boolean sourceOnly) {
+        this.sourceOnly = sourceOnly;
+    }
+
+    @Option(longName = "lineNumber")
+    @DefaultValue("true")
+    @Description("Output source code contins line number, default value true")
+    public void setLineNumber(boolean lineNumber) {
+        this.lineNumber = lineNumber;
+    }
+
+    @Override
+    public void process(CommandProcess process) {
+        RowAffect affect = new RowAffect();
+        Instrumentation inst = process.session().getInstrumentation();
+
+        if (code == null && classLoaderClass != null) {
+            List<ClassLoader> matchedClassLoaders = ClassLoaderUtils.getClassLoaderByClassName(inst, classLoaderClass);
+            if (matchedClassLoaders.size() == 1) {
+                code = Integer.toHexString(matchedClassLoaders.get(0).hashCode());
+            } else if (matchedClassLoaders.size() > 1) {
+                Collection<ClassLoaderVO> classLoaderVOList = ClassUtils.createClassLoaderVOList(matchedClassLoaders);
+                JadModel jadModel = new JadModel()
+                        .setClassLoaderClass(classLoaderClass)
+                        .setMatchedClassLoaders(classLoaderVOList);
+                process.appendResult(jadModel);
+                process.end(-1, "Found more than one classloader by class name, please specify classloader with '-c <classloader hash>'");
+                return;
+            } else {
+                process.end(-1, "Can not find classloader by class name: " + classLoaderClass + ".");
+                return;
+            }
+        }
+        
+        Set<Class<?>> matchedClasses = SearchUtils.searchClassOnly(inst, classPattern, isRegEx, code);
+
+        try {
+            ExitStatus status = null;
+            if (matchedClasses == null || matchedClasses.isEmpty()) {
+                status = processNoMatch(process);
+            } else if (matchedClasses.size() > 1) {
+                status = processMatches(process, matchedClasses);
+            } else { // matchedClasses size is 1
+                // find inner classes.
+                Set<Class<?>> withInnerClasses = SearchUtils.searchClassOnly(inst,  matchedClasses.iterator().next().getName() + "$*", false, code);
+                if(withInnerClasses.isEmpty()) {
+                    withInnerClasses = matchedClasses;
+                }
+                status = processExactMatch(process, affect, inst, matchedClasses, withInnerClasses);
+            }
+            if (!this.sourceOnly) {
+                process.appendResult(new RowAffectModel(affect));
+            }
+            CommandUtils.end(process, status);
+        } catch (Throwable e){
+            logger.error("processing error", e);
+            process.end(-1, "processing error");
+        }
+    }
+
+    private ExitStatus processExactMatch(CommandProcess process, RowAffect affect, Instrumentation inst, Set<Class<?>> matchedClasses, Set<Class<?>> withInnerClasses) {
+        Class<?> c = matchedClasses.iterator().next();
+        Set<Class<?>> allClasses = new HashSet<Class<?>>(withInnerClasses);
+        allClasses.add(c);
+
+        try {
+            ClassDumpTransformer transformer = new ClassDumpTransformer(allClasses);
+            InstrumentationUtils.retransformClasses(inst, transformer, allClasses);
+
+            Map<Class<?>, File> classFiles = transformer.getDumpResult();
+            File classFile = classFiles.get(c);
+
+            Pair<String,NavigableMap<Integer,Integer>> decompileResult = Decompiler.decompileWithMappings(classFile.getAbsolutePath(), methodName, hideUnicode, lineNumber);
+            String source = decompileResult.getFirst();
+            if (source != null) {
+                source = pattern.matcher(source).replaceAll("");
+            } else {
+                source = "unknown";
+            }
+
+            JadModel jadModel = new JadModel();
+            jadModel.setSource(source);
+            jadModel.setMappings(decompileResult.getSecond());
+            if (!this.sourceOnly) {
+                jadModel.setClassInfo(ClassUtils.createSimpleClassInfo(c));
+                jadModel.setLocation(ClassUtils.getCodeSource(c.getProtectionDomain().getCodeSource()));
+            }
+            process.appendResult(jadModel);
+
+            affect.rCnt(classFiles.keySet().size());
+            return ExitStatus.success();
+        } catch (Throwable t) {
+            logger.error("jad: fail to decompile class: " + c.getName(), t);
+            return ExitStatus.failure(-1, "jad: fail to decompile class: " + c.getName() + ", please check $HOME/logs/arthas/arthas.log for more details.");
+        }
+    }
+
+    private ExitStatus processMatches(CommandProcess process, Set<Class<?>> matchedClasses) {
+
+        String usage = "jad -c <hashcode> " + classPattern;
+        String msg = " Found more than one class for: " + classPattern + ", Please use " + usage;
+        process.appendResult(new MessageModel(msg));
+
+        List<ClassVO> classVOs = ClassUtils.createClassVOList(matchedClasses);
+        JadModel jadModel = new JadModel();
+        jadModel.setMatchedClasses(classVOs);
+        process.appendResult(jadModel);
+
+        return ExitStatus.failure(-1, msg);
+    }
+
+    private ExitStatus processNoMatch(CommandProcess process) {
+        return ExitStatus.failure(-1, "No class found for: " + classPattern);
+    }
+
+    @Override
+    public void complete(Completion completion) {
+        int argumentIndex = CompletionUtils.detectArgumentIndex(completion);
+
+        if (argumentIndex == 1) {
+            if (!CompletionUtils.completeClassName(completion)) {
+                super.complete(completion);
+            }
+            return;
+        } else if (argumentIndex == 2) {
+            if (!CompletionUtils.completeMethodName(completion)) {
+                super.complete(completion);
+            }
+            return;
+        }
+
+        super.complete(completion);
+    }
+}

core/src/main/java/com/taobao/arthas/core/command/klass100/MemoryCompilerCommand.java

+package com.taobao.arthas.core.command.klass100;
+
+import java.io.File;
+import java.lang.instrument.Instrumentation;
+import java.nio.charset.Charset;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Collection;
+
+import com.alibaba.arthas.deps.org.slf4j.Logger;
+import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
+import com.taobao.arthas.compiler.DynamicCompiler;
+import com.taobao.arthas.core.command.Constants;
+import com.taobao.arthas.core.command.model.MemoryCompilerModel;
+import com.taobao.arthas.core.command.model.RowAffectModel;
+import com.taobao.arthas.core.command.model.ClassLoaderVO;
+import com.taobao.arthas.core.shell.cli.Completion;
+import com.taobao.arthas.core.shell.cli.CompletionUtils;
+import com.taobao.arthas.core.shell.command.AnnotatedCommand;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+import com.taobao.arthas.core.util.FileUtils;
+import com.taobao.arthas.core.util.ClassUtils;
+import com.taobao.arthas.core.util.ClassLoaderUtils;
+import com.taobao.arthas.core.util.affect.RowAffect;
+import com.taobao.middleware.cli.annotations.Argument;
+import com.taobao.middleware.cli.annotations.Description;
+import com.taobao.middleware.cli.annotations.Name;
+import com.taobao.middleware.cli.annotations.Option;
+import com.taobao.middleware.cli.annotations.Summary;
+
+/**
+ *
+ * @author hengyunabc 2019-02-05
+ *
+ */
+@Name("mc")
+@Summary("Memory compiler, compiles java files into bytecode and class files in memory.")
+@Description(Constants.EXAMPLE + "  mc /tmp/Test.java\n" + "  mc -c 327a647b /tmp/Test.java\n"
+                + "  mc -d /tmp/output /tmp/ClassA.java /tmp/ClassB.java\n" + Constants.WIKI + Constants.WIKI_HOME
+                + "mc")
+public class MemoryCompilerCommand extends AnnotatedCommand {
+
+    private static final Logger logger = LoggerFactory.getLogger(MemoryCompilerCommand.class);
+
+    private String directory;
+    private String hashCode;
+    private String classLoaderClass;
+    private String encoding;
+
+    private List<String> sourcefiles;
+
+    @Argument(argName = "sourcefiles", index = 0)
+    @Description("source files")
+    public void setClassPattern(List<String> sourcefiles) {
+        this.sourcefiles = sourcefiles;
+    }
+
+    @Option(shortName = "c", longName = "classloader")
+    @Description("The hash code of the special ClassLoader")
+    public void setHashCode(String hashCode) {
+        this.hashCode = hashCode;
+    }
+
+    @Option(longName = "classLoaderClass")
+    @Description("The class name of the special class's classLoader.")
+    public void setClassLoaderClass(String classLoaderClass) {
+        this.classLoaderClass = classLoaderClass;
+    }
+
+    @Option(longName = "encoding")
+    @Description("Source file encoding")
+    public void setEncoding(String encoding) {
+        this.encoding = encoding;
+    }
+
+    @Option(shortName = "d", longName = "directory")
+    @Description("Sets the destination directory for class files")
+    public void setDirectory(String directory) {
+        this.directory = directory;
+    }
+
+    @Override
+    public void process(final CommandProcess process) {
+        RowAffect affect = new RowAffect();
+
+        try {
+            Instrumentation inst = process.session().getInstrumentation();
+
+            if (hashCode == null && classLoaderClass != null) {
+                List<ClassLoader> matchedClassLoaders = ClassLoaderUtils.getClassLoaderByClassName(inst, classLoaderClass);
+                if (matchedClassLoaders.size() == 1) {
+                    hashCode = Integer.toHexString(matchedClassLoaders.get(0).hashCode());
+                } else if (matchedClassLoaders.size() > 1) {
+                    Collection<ClassLoaderVO> classLoaderVOList = ClassUtils.createClassLoaderVOList(matchedClassLoaders);
+                    MemoryCompilerModel memoryCompilerModel = new MemoryCompilerModel()
+                            .setClassLoaderClass(classLoaderClass)
+                            .setMatchedClassLoaders(classLoaderVOList);
+                    process.appendResult(memoryCompilerModel);
+                    process.end(-1, "Found more than one classloader by class name, please specify classloader with '-c <classloader hash>'");
+                    return;
+                } else {
+                    process.end(-1, "Can not find classloader by class name: " + classLoaderClass + ".");
+                    return;
+                }
+            }
+            
+            ClassLoader classloader = null;
+            if (hashCode == null) {
+                classloader = ClassLoader.getSystemClassLoader();
+            } else {
+                classloader = ClassLoaderUtils.getClassLoader(inst, hashCode);
+                if (classloader == null) {
+                    process.end(-1, "Can not find classloader with hashCode: " + hashCode + ".");
+                    return;
+                }
+            }
+
+            DynamicCompiler dynamicCompiler = new DynamicCompiler(classloader);
+
+            Charset charset = Charset.defaultCharset();
+            if (encoding != null) {
+                charset = Charset.forName(encoding);
+            }
+
+            for (String sourceFile : sourcefiles) {
+                String sourceCode = FileUtils.readFileToString(new File(sourceFile), charset);
+                String name = new File(sourceFile).getName();
+                if (name.endsWith(".java")) {
+                    name = name.substring(0, name.length() - ".java".length());
+                }
+                dynamicCompiler.addSource(name, sourceCode);
+            }
+
+            Map<String, byte[]> byteCodes = dynamicCompiler.buildByteCodes();
+
+            File outputDir = null;
+            if (this.directory != null) {
+                outputDir = new File(this.directory);
+            } else {
+                outputDir = new File("").getAbsoluteFile();
+            }
+
+            List<String> files = new ArrayList<String>();
+            for (Entry<String, byte[]> entry : byteCodes.entrySet()) {
+                File byteCodeFile = new File(outputDir, entry.getKey().replace('.', '/') + ".class");
+                FileUtils.writeByteArrayToFile(byteCodeFile, entry.getValue());
+                files.add(byteCodeFile.getAbsolutePath());
+                affect.rCnt(1);
+            }
+            process.appendResult(new MemoryCompilerModel(files));
+            process.appendResult(new RowAffectModel(affect));
+            process.end();
+        } catch (Throwable e) {
+            logger.warn("Memory compiler error", e);
+            process.end(-1, "Memory compiler error, exception message: " + e.getMessage()
+                            + ", please check $HOME/logs/arthas/arthas.log for more details.");
+        }
+    }
+
+    @Override
+    public void complete(Completion completion) {
+        if (!CompletionUtils.completeFilePath(completion)) {
+            super.complete(completion);
+        }
+    }
+}

core/src/main/java/com/taobao/arthas/core/command/klass100/OgnlCommand.java

+package com.taobao.arthas.core.command.klass100;
+
+import java.lang.instrument.Instrumentation;
+import java.util.Collection;
+import java.util.List;
+
+import com.alibaba.arthas.deps.org.slf4j.Logger;
+import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
+import com.taobao.arthas.core.command.Constants;
+import com.taobao.arthas.core.command.express.Express;
+import com.taobao.arthas.core.command.express.ExpressException;
+import com.taobao.arthas.core.command.express.ExpressFactory;
+import com.taobao.arthas.core.command.model.ClassLoaderVO;
+import com.taobao.arthas.core.command.model.ObjectVO;
+import com.taobao.arthas.core.command.model.OgnlModel;
+import com.taobao.arthas.core.shell.command.AnnotatedCommand;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+import com.taobao.arthas.core.util.ClassLoaderUtils;
+import com.taobao.arthas.core.util.ClassUtils;
+import com.taobao.middleware.cli.annotations.Argument;
+import com.taobao.middleware.cli.annotations.Description;
+import com.taobao.middleware.cli.annotations.Name;
+import com.taobao.middleware.cli.annotations.Option;
+import com.taobao.middleware.cli.annotations.Summary;
+
+/**
+ *
+ * @author hengyunabc 2018-10-18
+ *
+ */
+@Name("ognl")
+@Summary("Execute ognl expression.")
+@Description(Constants.EXAMPLE
+                + "  ognl '@java.lang.System@out.println(\"hello \\u4e2d\\u6587\")' \n"
+                + "  ognl -x 2 '@Singleton@getInstance()' \n"
+                + "  ognl '@Demo@staticFiled' \n"
+                + "  ognl '#value1=@System@getProperty(\"java.home\"), #value2=@System@getProperty(\"java.runtime.name\"), {#value1, #value2}'\n"
+                + "  ognl -c 5d113a51 '@com.taobao.arthas.core.GlobalOptions@isDump' \n"
+                + Constants.WIKI + Constants.WIKI_HOME + "ognl\n"
+                + "  https://commons.apache.org/proper/commons-ognl/language-guide.html")
+public class OgnlCommand extends AnnotatedCommand {
+    private static final Logger logger = LoggerFactory.getLogger(OgnlCommand.class);
+
+    private String express;
+    private String hashCode;
+    private String classLoaderClass;
+    private int expand = 1;
+
+    @Argument(argName = "express", index = 0, required = true)
+    @Description("The ognl expression.")
+    public void setExpress(String express) {
+        this.express = express;
+    }
+
+    @Option(shortName = "c", longName = "classLoader")
+    @Description("The hash code of the special class's classLoader, default classLoader is SystemClassLoader.")
+    public void setHashCode(String hashCode) {
+        this.hashCode = hashCode;
+    }
+
+    @Option(longName = "classLoaderClass")
+    @Description("The class name of the special class's classLoader.")
+    public void setClassLoaderClass(String classLoaderClass) {
+        this.classLoaderClass = classLoaderClass;
+    }
+
+    @Option(shortName = "x", longName = "expand")
+    @Description("Expand level of object (1 by default).")
+    public void setExpand(Integer expand) {
+        this.expand = expand;
+    }
+
+    @Override
+    public void process(CommandProcess process) {
+        Instrumentation inst = process.session().getInstrumentation();
+        ClassLoader classLoader = null;
+        if (hashCode != null) {
+            classLoader = ClassLoaderUtils.getClassLoader(inst, hashCode);
+            if (classLoader == null) {
+                process.end(-1, "Can not find classloader with hashCode: " + hashCode + ".");
+                return;
+            }
+        } else if (classLoaderClass != null) {
+            List<ClassLoader> matchedClassLoaders = ClassLoaderUtils.getClassLoaderByClassName(inst, classLoaderClass);
+            if (matchedClassLoaders.size() == 1) {
+                classLoader = matchedClassLoaders.get(0);
+            } else if (matchedClassLoaders.size() > 1) {
+                Collection<ClassLoaderVO> classLoaderVOList = ClassUtils.createClassLoaderVOList(matchedClassLoaders);
+                OgnlModel ognlModel = new OgnlModel()
+                        .setClassLoaderClass(classLoaderClass)
+                        .setMatchedClassLoaders(classLoaderVOList);
+                process.appendResult(ognlModel);
+                process.end(-1, "Found more than one classloader by class name, please specify classloader with '-c <classloader hash>'");
+                return;
+            } else {
+                process.end(-1, "Can not find classloader by class name: " + classLoaderClass + ".");
+                return;
+            }
+        } else {
+            classLoader = ClassLoader.getSystemClassLoader();
+        }
+
+        Express unpooledExpress = ExpressFactory.unpooledExpress(classLoader);
+        try {
+            Object value = unpooledExpress.get(express);
+            OgnlModel ognlModel = new OgnlModel()
+                    .setValue(new ObjectVO(value, expand));
+            process.appendResult(ognlModel);
+            process.end();
+        } catch (ExpressException e) {
+            logger.warn("ognl: failed execute express: " + express, e);
+            process.end(-1, "Failed to execute ognl, exception message: " + e.getMessage()
+                    + ", please check $HOME/logs/arthas/arthas.log for more details. ");
+        }
+    }
+}

core/src/main/java/com/taobao/arthas/core/command/klass100/RedefineCommand.java

+package com.taobao.arthas.core.command.klass100;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.lang.instrument.ClassDefinition;
+import java.lang.instrument.Instrumentation;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Collection;
+
+import com.alibaba.deps.org.objectweb.asm.ClassReader;
+import com.alibaba.arthas.deps.org.slf4j.Logger;
+import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
+import com.taobao.arthas.core.command.Constants;
+import com.taobao.arthas.core.command.model.RedefineModel;
+import com.taobao.arthas.core.command.model.ClassLoaderVO;
+import com.taobao.arthas.core.shell.cli.Completion;
+import com.taobao.arthas.core.shell.cli.CompletionUtils;
+import com.taobao.arthas.core.shell.command.AnnotatedCommand;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+import com.taobao.arthas.core.util.ClassUtils;
+import com.taobao.arthas.core.util.ClassLoaderUtils;
+import com.taobao.middleware.cli.annotations.Argument;
+import com.taobao.middleware.cli.annotations.Description;
+import com.taobao.middleware.cli.annotations.Name;
+import com.taobao.middleware.cli.annotations.Option;
+import com.taobao.middleware.cli.annotations.Summary;
+
+/**
+ * Redefine Classes.
+ *
+ * @author hengyunabc 2018-07-13
+ * @see java.lang.instrument.Instrumentation#redefineClasses(ClassDefinition...)
+ */
+@Name("redefine")
+@Summary("Redefine classes. @see Instrumentation#redefineClasses(ClassDefinition...)")
+@Description(Constants.EXAMPLE +
+                "  redefine /tmp/Test.class\n" +
+                "  redefine -c 327a647b /tmp/Test.class /tmp/Test\\$Inner.class \n" +
+                "  redefine --classLoaderClass 'sun.misc.Launcher$AppClassLoader' /tmp/Test.class \n" +
+                Constants.WIKI + Constants.WIKI_HOME + "redefine")
+public class RedefineCommand extends AnnotatedCommand {
+    private static final Logger logger = LoggerFactory.getLogger(RedefineCommand.class);
+    private static final int MAX_FILE_SIZE = 10 * 1024 * 1024;
+
+    private String hashCode;
+    private String classLoaderClass;
+
+    private List<String> paths;
+
+    @Option(shortName = "c", longName = "classloader")
+    @Description("classLoader hashcode")
+    public void setHashCode(String hashCode) {
+        this.hashCode = hashCode;
+    }
+
+    @Option(longName = "classLoaderClass")
+    @Description("The class name of the special class's classLoader.")
+    public void setClassLoaderClass(String classLoaderClass) {
+        this.classLoaderClass = classLoaderClass;
+    }
+
+    @Argument(argName = "classfilePaths", index = 0)
+    @Description(".class file paths")
+    public void setPaths(List<String> paths) {
+        this.paths = paths;
+    }
+
+    @Override
+    public void process(CommandProcess process) {
+        RedefineModel redefineModel = new RedefineModel();
+        Instrumentation inst = process.session().getInstrumentation();
+        for (String path : paths) {
+            File file = new File(path);
+            if (!file.exists()) {
+                process.end(-1, "file does not exist, path:" + path);
+                return;
+            }
+            if (!file.isFile()) {
+                process.end(-1, "not a normal file, path:" + path);
+                return;
+            }
+            if (file.length() >= MAX_FILE_SIZE) {
+                process.end(-1, "file size: " + file.length() + " >= " + MAX_FILE_SIZE + ", path: " + path);
+                return;
+            }
+        }
+
+        Map<String, byte[]> bytesMap = new HashMap<String, byte[]>();
+        for (String path : paths) {
+            RandomAccessFile f = null;
+            try {
+                f = new RandomAccessFile(path, "r");
+                final byte[] bytes = new byte[(int) f.length()];
+                f.readFully(bytes);
+
+                final String clazzName = readClassName(bytes);
+
+                bytesMap.put(clazzName, bytes);
+
+            } catch (Exception e) {
+                logger.warn("load class file failed: "+path, e);
+                process.end(-1, "load class file failed: " +path+", error: " + e);
+                return;
+            } finally {
+                if (f != null) {
+                    try {
+                        f.close();
+                    } catch (IOException e) {
+                        // ignore
+                    }
+                }
+            }
+        }
+
+        if (bytesMap.size() != paths.size()) {
+            process.end(-1, "paths may contains same class name!");
+            return;
+        }
+
+        List<ClassDefinition> definitions = new ArrayList<ClassDefinition>();
+        for (Class<?> clazz : inst.getAllLoadedClasses()) {
+            if (bytesMap.containsKey(clazz.getName())) {
+
+                if (hashCode == null && classLoaderClass != null) {
+                    List<ClassLoader> matchedClassLoaders = ClassLoaderUtils.getClassLoaderByClassName(inst, classLoaderClass);
+                    if (matchedClassLoaders.size() == 1) {
+                        hashCode = Integer.toHexString(matchedClassLoaders.get(0).hashCode());
+                    } else if (matchedClassLoaders.size() > 1) {
+                        Collection<ClassLoaderVO> classLoaderVOList = ClassUtils.createClassLoaderVOList(matchedClassLoaders);
+                        RedefineModel classredefineModel = new RedefineModel()
+                                .setClassLoaderClass(classLoaderClass)
+                                .setMatchedClassLoaders(classLoaderVOList);
+                        process.appendResult(classredefineModel);
+                        process.end(-1, "Found more than one classloader by class name, please specify classloader with '-c <classloader hash>'");
+                        return;
+                    } else {
+                        process.end(-1, "Can not find classloader by class name: " + classLoaderClass + ".");
+                        return;
+                    }
+                }
+                
+                ClassLoader classLoader = clazz.getClassLoader();
+                if (classLoader != null && hashCode != null && !Integer.toHexString(classLoader.hashCode()).equals(hashCode)) {
+                    continue;
+                }
+                definitions.add(new ClassDefinition(clazz, bytesMap.get(clazz.getName())));
+                redefineModel.addRedefineClass(clazz.getName());
+                logger.info("Try redefine class name: {}, ClassLoader: {}", clazz.getName(), clazz.getClassLoader());
+            }
+        }
+
+        try {
+            if (definitions.isEmpty()) {
+                process.end(-1, "These classes are not found in the JVM and may not be loaded: " + bytesMap.keySet());
+                return;
+            }
+            inst.redefineClasses(definitions.toArray(new ClassDefinition[0]));
+            process.appendResult(redefineModel);
+            process.end();
+        } catch (Throwable e) {
+            String message = "redefine error! " + e.toString();
+            logger.error(message, e);
+            process.end(-1, message);
+        }
+
+    }
+
+    private static String readClassName(final byte[] bytes) {
+        return new ClassReader(bytes).getClassName().replace("/", ".");
+    }
+
+    @Override
+    public void complete(Completion completion) {
+        if (!CompletionUtils.completeFilePath(completion)) {
+            super.complete(completion);
+        }
+    }
+}

core/src/main/java/com/taobao/arthas/core/command/klass100/RetransformCommand.java

+package com.taobao.arthas.core.command.klass100;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.lang.instrument.ClassFileTransformer;
+import java.lang.instrument.IllegalClassFormatException;
+import java.lang.instrument.Instrumentation;
+import java.security.ProtectionDomain;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.ListIterator;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import com.alibaba.arthas.deps.org.slf4j.Logger;
+import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
+import com.alibaba.deps.org.objectweb.asm.ClassReader;
+import com.taobao.arthas.core.advisor.TransformerManager;
+import com.taobao.arthas.core.command.Constants;
+import com.taobao.arthas.core.command.model.ClassLoaderVO;
+import com.taobao.arthas.core.command.model.RetransformModel;
+import com.taobao.arthas.core.server.ArthasBootstrap;
+import com.taobao.arthas.core.shell.cli.CliToken;
+import com.taobao.arthas.core.shell.cli.Completion;
+import com.taobao.arthas.core.shell.cli.CompletionUtils;
+import com.taobao.arthas.core.shell.command.AnnotatedCommand;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+import com.taobao.arthas.core.util.ClassLoaderUtils;
+import com.taobao.arthas.core.util.ClassUtils;
+import com.taobao.arthas.core.util.SearchUtils;
+import com.taobao.middleware.cli.annotations.Argument;
+import com.taobao.middleware.cli.annotations.DefaultValue;
+import com.taobao.middleware.cli.annotations.Description;
+import com.taobao.middleware.cli.annotations.Name;
+import com.taobao.middleware.cli.annotations.Option;
+import com.taobao.middleware.cli.annotations.Summary;
+
+/**
+ * 
+ * Retransform Classes.
+ *
+ * @author hengyunabc 2021-01-05
+ * @see java.lang.instrument.Instrumentation#retransformClasses(Class...)
+ */
+@Name("retransform")
+@Summary("Retransform classes. @see Instrumentation#retransformClasses(Class...)")
+@Description(Constants.EXAMPLE + "  retransform /tmp/Test.class\n"
+        + "  retransform -l \n"
+        + "  retransform -d 1                    # delete retransform entry\n"
+        + "  retransform --deleteAll             # delete all retransform entries\n"
+        + "  retransform --classPattern demo.*   # triger retransform classes\n"
+        + "  retransform -c 327a647b /tmp/Test.class /tmp/Test\\$Inner.class \n"
+        + "  retransform --classLoaderClass 'sun.misc.Launcher$AppClassLoader' /tmp/Test.class\n"
+        + Constants.WIKI + Constants.WIKI_HOME
+        + "retransform")
+public class RetransformCommand extends AnnotatedCommand {
+    private static final Logger logger = LoggerFactory.getLogger(RetransformCommand.class);
+    private static final int MAX_FILE_SIZE = 10 * 1024 * 1024;
+
+    private static volatile List<RetransformEntry> retransformEntries = new ArrayList<RetransformEntry>();
+    private static volatile ClassFileTransformer transformer = null;
+    
+    private String hashCode;
+    private String classLoaderClass;
+
+    private List<String> paths;
+
+    private boolean list;
+
+    private int delete = -1;
+
+    private boolean deleteAll;
+
+    private String classPattern;
+
+    private int limit;
+
+    @Option(shortName = "l", longName = "list", flag = true)
+    @Description("list all retransform entry.")
+    public void setList(boolean list) {
+        this.list = list;
+    }
+
+    @Option(shortName = "d", longName = "delete")
+    @Description("delete retransform entry by id.")
+    public void setDelete(int delete) {
+        this.delete = delete;
+    }
+
+    @Option(longName = "deleteAll", flag = true)
+    @Description("delete all retransform entries.")
+    public void setDeleteAll(boolean deleteAll) {
+        this.deleteAll = deleteAll;
+    }
+
+    @Option(longName = "classPattern")
+    @Description("trigger retransform matched classes by class pattern.")
+    public void setClassPattern(String classPattern) {
+        this.classPattern = classPattern;
+    }
+
+    @Option(shortName = "c", longName = "classloader")
+    @Description("classLoader hashcode")
+    public void setHashCode(String hashCode) {
+        this.hashCode = hashCode;
+    }
+
+    @Option(longName = "classLoaderClass")
+    @Description("The class name of the special class's classLoader.")
+    public void setClassLoaderClass(String classLoaderClass) {
+        this.classLoaderClass = classLoaderClass;
+    }
+
+    @Argument(argName = "classfilePaths", index = 0, required = false)
+    @Description(".class file paths")
+    public void setPaths(List<String> paths) {
+        this.paths = paths;
+    }
+
+    @Option(longName = "limit")
+    @Description("The limit of dump classes size, default value is 50")
+    @DefaultValue("50")
+    public void setLimit(int limit) {
+        this.limit = limit;
+    }
+
+    private static void initTransformer() {
+        if (transformer != null) {
+            return;
+        } else {
+            synchronized (RetransformCommand.class) {
+                if (transformer == null) {
+                    transformer = new RetransformClassFileTransformer();
+                    TransformerManager transformerManager = ArthasBootstrap.getInstance().getTransformerManager();
+                    transformerManager.addRetransformer(transformer);
+                }
+            }
+        }
+    }
+
+    @Override
+    public void process(CommandProcess process) {
+        initTransformer();
+
+        RetransformModel retransformModel = new RetransformModel();
+        Instrumentation inst = process.session().getInstrumentation();
+
+        if (this.list) {
+            List<RetransformEntry> retransformEntryList = allRetransformEntries();
+            retransformModel.setRetransformEntries(retransformEntryList);
+            process.appendResult(retransformModel);
+            process.end();
+            return;
+        } else if (this.deleteAll) {
+            deleteAllRetransformEntry();
+            process.appendResult(retransformModel);
+            process.end();
+            return;
+        } else if (this.delete > 0) {
+            deleteRetransformEntry(this.delete);
+            process.end();
+            return;
+        } else if (this.classPattern != null) {
+            Set<Class<?>> searchClass = SearchUtils.searchClass(inst, classPattern, false, this.hashCode);
+            if (searchClass.isEmpty()) {
+                process.end(-1, "These classes are not found in the JVM and may not be loaded: " + classPattern);
+                return;
+            }
+
+            if (searchClass.size() > limit) {
+                process.end(-1, "match classes size: " + searchClass.size() + ", more than limit: " + limit
+                        + ", It is recommended to use a more precise class pattern.");
+            }
+            try {
+                inst.retransformClasses(searchClass.toArray(new Class[0]));
+                for (Class<?> clazz : searchClass) {
+                    retransformModel.addRetransformClass(clazz.getName());
+                }
+                process.appendResult(retransformModel);
+                process.end();
+                return;
+            } catch (Throwable e) {
+                String message = "retransform error! " + e.toString();
+                logger.error(message, e);
+                process.end(-1, message);
+                return;
+            }
+        }
+
+        for (String path : paths) {
+            File file = new File(path);
+            if (!file.exists()) {
+                process.end(-1, "file does not exist, path:" + path);
+                return;
+            }
+            if (!file.isFile()) {
+                process.end(-1, "not a normal file, path:" + path);
+                return;
+            }
+            if (file.length() >= MAX_FILE_SIZE) {
+                process.end(-1, "file size: " + file.length() + " >= " + MAX_FILE_SIZE + ", path: " + path);
+                return;
+            }
+        }
+
+        Map<String, byte[]> bytesMap = new HashMap<String, byte[]>();
+        for (String path : paths) {
+            RandomAccessFile f = null;
+            try {
+                f = new RandomAccessFile(path, "r");
+                final byte[] bytes = new byte[(int) f.length()];
+                f.readFully(bytes);
+
+                final String clazzName = readClassName(bytes);
+
+                bytesMap.put(clazzName, bytes);
+
+            } catch (Exception e) {
+                logger.warn("load class file failed: " + path, e);
+                process.end(-1, "load class file failed: " + path + ", error: " + e);
+                return;
+            } finally {
+                if (f != null) {
+                    try {
+                        f.close();
+                    } catch (IOException e) {
+                        // ignore
+                    }
+                }
+            }
+        }
+
+        if (bytesMap.size() != paths.size()) {
+            process.end(-1, "paths may contains same class name!");
+            return;
+        }
+
+        List<RetransformEntry> retransformEntryList = new ArrayList<RetransformEntry>();
+
+        List<Class<?>> classList = new ArrayList<Class<?>>();
+
+        for (Class<?> clazz : inst.getAllLoadedClasses()) {
+            if (bytesMap.containsKey(clazz.getName())) {
+
+                if (hashCode == null && classLoaderClass != null) {
+                    List<ClassLoader> matchedClassLoaders = ClassLoaderUtils.getClassLoaderByClassName(inst,
+                            classLoaderClass);
+                    if (matchedClassLoaders.size() == 1) {
+                        hashCode = Integer.toHexString(matchedClassLoaders.get(0).hashCode());
+                    } else if (matchedClassLoaders.size() > 1) {
+                        Collection<ClassLoaderVO> classLoaderVOList = ClassUtils
+                                .createClassLoaderVOList(matchedClassLoaders);
+                        retransformModel.setClassLoaderClass(classLoaderClass)
+                                .setMatchedClassLoaders(classLoaderVOList);
+                        process.appendResult(retransformModel);
+                        process.end(-1,
+                                "Found more than one classloader by class name, please specify classloader with '-c <classloader hash>'");
+                        return;
+                    } else {
+                        process.end(-1, "Can not find classloader by class name: " + classLoaderClass + ".");
+                        return;
+                    }
+                }
+
+                ClassLoader classLoader = clazz.getClassLoader();
+                if (classLoader != null && hashCode != null
+                        && !Integer.toHexString(classLoader.hashCode()).equals(hashCode)) {
+                    continue;
+                }
+
+                RetransformEntry retransformEntry = new RetransformEntry(clazz.getName(), bytesMap.get(clazz.getName()),
+                        hashCode, classLoaderClass);
+                retransformEntryList.add(retransformEntry);
+                classList.add(clazz);
+                retransformModel.addRetransformClass(clazz.getName());
+
+                logger.info("Try retransform class name: {}, ClassLoader: {}", clazz.getName(), clazz.getClassLoader());
+            }
+        }
+
+        try {
+            if (retransformEntryList.isEmpty()) {
+                process.end(-1, "These classes are not found in the JVM and may not be loaded: " + bytesMap.keySet());
+                return;
+            }
+            addRetransformEntry(retransformEntryList);
+
+            inst.retransformClasses(classList.toArray(new Class[0]));
+
+            process.appendResult(retransformModel);
+            process.end();
+        } catch (Throwable e) {
+            String message = "retransform error! " + e.toString();
+            logger.error(message, e);
+            process.end(-1, message);
+        }
+
+    }
+
+    private static String readClassName(final byte[] bytes) {
+        return new ClassReader(bytes).getClassName().replace('/', '.');
+    }
+
+    @Override
+    public void complete(Completion completion) {
+        List<CliToken> tokens = completion.lineTokens();
+
+        if (CompletionUtils.shouldCompleteOption(completion, "--classPattern")) {
+            CompletionUtils.completeClassName(completion);
+            return;
+        }
+
+        for (CliToken token : tokens) {
+            String tokenStr = token.value();
+            if (tokenStr != null && tokenStr.startsWith("-")) {
+                super.complete(completion);
+                return;
+            }
+        }
+
+        // 最后，没有有 - 开头的，才尝试补全 file path
+        if (!CompletionUtils.completeFilePath(completion)) {
+            super.complete(completion);
+        }
+    }
+
+    public static class RetransformEntry {
+        private static final AtomicInteger counter = new AtomicInteger(0);
+        private int id;
+        private String className;
+        private byte[] bytes;
+        private String hashCode;
+        private String classLoaderClass;
+
+        /**
+         * 被 transform 触发次数
+         */
+        private int transformCount = 0;
+
+        public RetransformEntry(String className, byte[] bytes, String hashCode, String classLoaderClass) {
+            id = counter.incrementAndGet();
+            this.className = className;
+            this.bytes = bytes;
+            this.hashCode = hashCode;
+            this.classLoaderClass = classLoaderClass;
+        }
+
+        public void incTransformCount() {
+            transformCount++;
+        }
+
+        public int getId() {
+            return id;
+        }
+
+        public void setId(int id) {
+            this.id = id;
+        }
+
+        public int getTransformCount() {
+            return transformCount;
+        }
+
+        public void setTransformCount(int transformCount) {
+            this.transformCount = transformCount;
+        }
+
+        public String getClassName() {
+            return className;
+        }
+
+        public void setClassName(String className) {
+            this.className = className;
+        }
+
+        public byte[] getBytes() {
+            return bytes;
+        }
+
+        public void setBytes(byte[] bytes) {
+            this.bytes = bytes;
+        }
+
+        public String getHashCode() {
+            return hashCode;
+        }
+
+        public void setHashCode(String hashCode) {
+            this.hashCode = hashCode;
+        }
+
+        public String getClassLoaderClass() {
+            return classLoaderClass;
+        }
+
+        public void setClassLoaderClass(String classLoaderClass) {
+            this.classLoaderClass = classLoaderClass;
+        }
+    }
+
+    public static synchronized void addRetransformEntry(List<RetransformEntry> retransformEntryList) {
+        List<RetransformEntry> tmp = new ArrayList<RetransformEntry>();
+        tmp.addAll(retransformEntries);
+        tmp.addAll(retransformEntryList);
+        Collections.sort(tmp, new Comparator<RetransformEntry>() {
+            @Override
+            public int compare(RetransformEntry entry1, RetransformEntry entry2) {
+                return entry1.getId() - entry2.getId();
+            }
+        });
+        retransformEntries = tmp;
+    }
+
+    public static synchronized RetransformEntry deleteRetransformEntry(int id) {
+        RetransformEntry result = null;
+        List<RetransformEntry> tmp = new ArrayList<RetransformEntry>();
+        for (RetransformEntry entry : retransformEntries) {
+            if (entry.getId() != id) {
+                tmp.add(entry);
+            } else {
+                result = entry;
+            }
+        }
+        retransformEntries = tmp;
+        return result;
+    }
+
+    public static List<RetransformEntry> allRetransformEntries() {
+        return retransformEntries;
+    }
+
+    public static synchronized void deleteAllRetransformEntry() {
+        retransformEntries = new ArrayList<RetransformEntry>();
+    }
+
+    static class RetransformClassFileTransformer implements ClassFileTransformer {
+        @Override
+        public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,
+                ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
+
+            if (className == null) {
+                return null;
+            }
+
+            className = className.replace('/', '.');
+
+            List<RetransformEntry> allRetransformEntries = allRetransformEntries();
+            // 倒序，因为要执行的配置生效
+            ListIterator<RetransformEntry> listIterator = allRetransformEntries
+                    .listIterator(allRetransformEntries.size());
+            while (listIterator.hasPrevious()) {
+                RetransformEntry retransformEntry = listIterator.previous();
+                int id = retransformEntry.getId();
+                // 判断类名是否一致
+                boolean updateFlag = false;
+                // 类名一致，则看是否要比较 loader，如果不需要比较 loader，则认为成功
+                if (className.equals(retransformEntry.getClassName())) {
+                    if (retransformEntry.getClassLoaderClass() != null || retransformEntry.getHashCode() != null) {
+                        updateFlag = isLoaderMatch(retransformEntry, loader);
+                    } else {
+                        updateFlag = true;
+                    }
+                }
+
+                if (updateFlag) {
+                    logger.info("RetransformCommand match class: {}, id: {}, classLoaderClass: {}, hashCode: {}",
+                            className, id, retransformEntry.getClassLoaderClass(), retransformEntry.getHashCode());
+                    retransformEntry.incTransformCount();
+                    return retransformEntry.getBytes();
+                }
+
+            }
+
+            return null;
+        }
+
+        private boolean isLoaderMatch(RetransformEntry retransformEntry, ClassLoader loader) {
+            if (loader == null) {
+                return false;
+            }
+            if (retransformEntry.getClassLoaderClass() != null) {
+                if (loader.getClass().getName().equals(retransformEntry.getClassLoaderClass())) {
+                    return true;
+                }
+            }
+            if (retransformEntry.getHashCode() != null) {
+                String hashCode = Integer.toHexString(loader.hashCode());
+                if (hashCode.equals(retransformEntry.getHashCode())) {
+                    return true;
+                }
+            }
+            return false;
+        }
+
+    }
+}

core/src/main/java/com/taobao/arthas/core/command/klass100/SearchClassCommand.java

+package com.taobao.arthas.core.command.klass100;
+
+
+import java.lang.instrument.Instrumentation;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+import com.taobao.arthas.core.command.Constants;
+import com.taobao.arthas.core.command.model.ClassDetailVO;
+import com.taobao.arthas.core.command.model.SearchClassModel;
+import com.taobao.arthas.core.command.model.RowAffectModel;
+import com.taobao.arthas.core.command.model.ClassLoaderVO;
+import com.taobao.arthas.core.shell.cli.Completion;
+import com.taobao.arthas.core.shell.cli.CompletionUtils;
+import com.taobao.arthas.core.shell.command.AnnotatedCommand;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+import com.taobao.arthas.core.util.ClassUtils;
+import com.taobao.arthas.core.util.ClassLoaderUtils;
+import com.taobao.arthas.core.util.ResultUtils;
+import com.taobao.arthas.core.util.SearchUtils;
+import com.taobao.arthas.core.util.StringUtils;
+import com.taobao.arthas.core.util.affect.RowAffect;
+import com.taobao.middleware.cli.annotations.Argument;
+import com.taobao.middleware.cli.annotations.Description;
+import com.taobao.middleware.cli.annotations.Name;
+import com.taobao.middleware.cli.annotations.Option;
+import com.taobao.middleware.cli.annotations.Summary;
+
+/**
+ * 展示类信息
+ *
+ * @author vlinux
+ */
+@Name("sc")
+@Summary("Search all the classes loaded by JVM")
+@Description(Constants.EXAMPLE +
+        "  sc -d org.apache.commons.lang.StringUtils\n" +
+        "  sc -d org/apache/commons/lang/StringUtils\n" +
+        "  sc -d *StringUtils\n" +
+        "  sc -d -f org.apache.commons.lang.StringUtils\n" +
+        "  sc -E org\\\\.apache\\\\.commons\\\\.lang\\\\.StringUtils\n" +
+        Constants.WIKI + Constants.WIKI_HOME + "sc")
+public class SearchClassCommand extends AnnotatedCommand {
+    private String classPattern;
+    private boolean isDetail = false;
+    private boolean isField = false;
+    private boolean isRegEx = false;
+    private String hashCode = null;
+    private String classLoaderClass;
+    private Integer expand;
+    private int numberOfLimit = 100;
+
+    @Argument(argName = "class-pattern", index = 0)
+    @Description("Class name pattern, use either '.' or '/' as separator")
+    public void setClassPattern(String classPattern) {
+        this.classPattern = classPattern;
+    }
+
+    @Option(shortName = "d", longName = "details", flag = true)
+    @Description("Display the details of class")
+    public void setDetail(boolean detail) {
+        isDetail = detail;
+    }
+
+    @Option(shortName = "f", longName = "field", flag = true)
+    @Description("Display all the member variables")
+    public void setField(boolean field) {
+        isField = field;
+    }
+
+    @Option(shortName = "E", longName = "regex", flag = true)
+    @Description("Enable regular expression to match (wildcard matching by default)")
+    public void setRegEx(boolean regEx) {
+        isRegEx = regEx;
+    }
+
+    @Option(shortName = "x", longName = "expand")
+    @Description("Expand level of object (0 by default)")
+    public void setExpand(Integer expand) {
+        this.expand = expand;
+    }
+
+    @Option(shortName = "c", longName = "classloader")
+    @Description("The hash code of the special class's classLoader")
+    public void setHashCode(String hashCode) {
+        this.hashCode = hashCode;
+    }
+
+    @Option(longName = "classLoaderClass")
+    @Description("The class name of the special class's classLoader.")
+    public void setClassLoaderClass(String classLoaderClass) {
+        this.classLoaderClass = classLoaderClass;
+    }
+
+    @Option(shortName = "n", longName = "limits")
+    @Description("Maximum number of matching classes with details (100 by default)")
+    public void setNumberOfLimit(int numberOfLimit) {
+        this.numberOfLimit = numberOfLimit;
+    }
+
+    @Override
+    public void process(final CommandProcess process) {
+        // TODO: null check
+        RowAffect affect = new RowAffect();
+        Instrumentation inst = process.session().getInstrumentation();
+
+        if (hashCode == null && classLoaderClass != null) {
+            List<ClassLoader> matchedClassLoaders = ClassLoaderUtils.getClassLoaderByClassName(inst, classLoaderClass);
+            if (matchedClassLoaders.size() == 1) {
+                hashCode = Integer.toHexString(matchedClassLoaders.get(0).hashCode());
+            } else if (matchedClassLoaders.size() > 1) {
+                Collection<ClassLoaderVO> classLoaderVOList = ClassUtils.createClassLoaderVOList(matchedClassLoaders);
+                SearchClassModel searchclassModel = new SearchClassModel()
+                        .setClassLoaderClass(classLoaderClass)
+                        .setMatchedClassLoaders(classLoaderVOList);
+                process.appendResult(searchclassModel);
+                process.end(-1, "Found more than one classloader by class name, please specify classloader with '-c <classloader hash>'");
+                return;
+            } else {
+                process.end(-1, "Can not find classloader by class name: " + classLoaderClass + ".");
+                return;
+            }
+        }
+
+        List<Class<?>> matchedClasses = new ArrayList<Class<?>>(SearchUtils.searchClass(inst, classPattern, isRegEx, hashCode));
+        Collections.sort(matchedClasses, new Comparator<Class<?>>() {
+            @Override
+            public int compare(Class<?> c1, Class<?> c2) {
+                return StringUtils.classname(c1).compareTo(StringUtils.classname(c2));
+            }
+        });
+
+        if (isDetail) {
+            if (numberOfLimit > 0 && matchedClasses.size() > numberOfLimit) {
+                process.end(-1, "The number of matching classes is greater than : " + numberOfLimit+". \n" +
+                        "Please specify a more accurate 'class-patten' or use the parameter '-n' to change the maximum number of matching classes.");
+                return;
+            }
+            for (Class<?> clazz : matchedClasses) {
+                ClassDetailVO classInfo = ClassUtils.createClassInfo(clazz, isField, expand);
+                process.appendResult(new SearchClassModel(classInfo, isDetail, isField));
+            }
+        } else {
+            int pageSize = 256;
+            ResultUtils.processClassNames(matchedClasses, pageSize, new ResultUtils.PaginationHandler<List<String>>() {
+                @Override
+                public boolean handle(List<String> classNames, int segment) {
+                    process.appendResult(new SearchClassModel(classNames, segment));
+                    return true;
+                }
+            });
+        }
+
+        affect.rCnt(matchedClasses.size());
+        process.appendResult(new RowAffectModel(affect));
+        process.end();
+    }
+
+    @Override
+    public void complete(Completion completion) {
+        if (!CompletionUtils.completeClassName(completion)) {
+            super.complete(completion);
+        }
+    }
+}

core/src/main/java/com/taobao/arthas/core/command/klass100/SearchMethodCommand.java

+package com.taobao.arthas.core.command.klass100;
+
+
+import java.lang.instrument.Instrumentation;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Method;
+import java.util.Set;
+import java.util.Collection;
+import java.util.List;
+
+import com.alibaba.arthas.deps.org.slf4j.Logger;
+import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
+import com.taobao.arthas.core.command.Constants;
+import com.taobao.arthas.core.command.model.SearchMethodModel;
+import com.taobao.arthas.core.command.model.MethodVO;
+import com.taobao.arthas.core.command.model.RowAffectModel;
+import com.taobao.arthas.core.command.model.ClassLoaderVO;
+import com.taobao.arthas.core.shell.cli.Completion;
+import com.taobao.arthas.core.shell.cli.CompletionUtils;
+import com.taobao.arthas.core.shell.command.AnnotatedCommand;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+import com.taobao.arthas.core.util.ClassUtils;
+import com.taobao.arthas.core.util.ClassLoaderUtils;
+import com.taobao.arthas.core.util.SearchUtils;
+import com.taobao.arthas.core.util.StringUtils;
+import com.taobao.arthas.core.util.affect.RowAffect;
+import com.taobao.arthas.core.util.matcher.Matcher;
+import com.taobao.arthas.core.util.matcher.RegexMatcher;
+import com.taobao.arthas.core.util.matcher.WildcardMatcher;
+import com.taobao.middleware.cli.annotations.Argument;
+import com.taobao.middleware.cli.annotations.Description;
+import com.taobao.middleware.cli.annotations.Name;
+import com.taobao.middleware.cli.annotations.Option;
+import com.taobao.middleware.cli.annotations.Summary;
+
+/**
+ * 展示方法信息
+ *
+ * @author vlinux
+ * @author hengyunabc 2019-02-13
+ */
+@Name("sm")
+@Summary("Search the method of classes loaded by JVM")
+@Description(Constants.EXAMPLE +
+        "  sm java.lang.String\n" +
+        "  sm -d org.apache.commons.lang.StringUtils\n" +
+        "  sm -d org/apache/commons/lang/StringUtils\n" +
+        "  sm *StringUtils *\n" +
+        "  sm -Ed org\\\\.apache\\\\.commons\\\\.lang\\.StringUtils .*\n" +
+        Constants.WIKI + Constants.WIKI_HOME + "sm")
+public class SearchMethodCommand extends AnnotatedCommand {
+    private static final Logger logger = LoggerFactory.getLogger(SearchMethodCommand.class);
+
+    private String classPattern;
+    private String methodPattern;
+    private String hashCode = null;
+    private String classLoaderClass;
+    private boolean isDetail = false;
+    private boolean isRegEx = false;
+    private int numberOfLimit = 100;
+
+    @Argument(argName = "class-pattern", index = 0)
+    @Description("Class name pattern, use either '.' or '/' as separator")
+    public void setClassPattern(String classPattern) {
+        this.classPattern = classPattern;
+    }
+
+    @Argument(argName = "method-pattern", index = 1, required = false)
+    @Description("Method name pattern")
+    public void setMethodPattern(String methodPattern) {
+        this.methodPattern = methodPattern;
+    }
+
+    @Option(shortName = "d", longName = "details", flag = true)
+    @Description("Display the details of method")
+    public void setDetail(boolean detail) {
+        isDetail = detail;
+    }
+
+    @Option(shortName = "E", longName = "regex", flag = true)
+    @Description("Enable regular expression to match (wildcard matching by default)")
+    public void setRegEx(boolean regEx) {
+        isRegEx = regEx;
+    }
+
+    @Option(shortName = "c", longName = "classloader")
+    @Description("The hash code of the special class's classLoader")
+    public void setHashCode(String hashCode) {
+        this.hashCode = hashCode;
+    }
+
+    @Option(longName = "classLoaderClass")
+    @Description("The class name of the special class's classLoader.")
+    public void setClassLoaderClass(String classLoaderClass) {
+        this.classLoaderClass = classLoaderClass;
+    }
+
+    @Option(shortName = "n", longName = "limits")
+    @Description("Maximum number of matching classes (100 by default)")
+    public void setNumberOfLimit(int numberOfLimit) {
+        this.numberOfLimit = numberOfLimit;
+    }
+
+    @Override
+    public void process(CommandProcess process) {
+        RowAffect affect = new RowAffect();
+
+        Instrumentation inst = process.session().getInstrumentation();
+        Matcher<String> methodNameMatcher = methodNameMatcher();
+        
+        if (hashCode == null && classLoaderClass != null) {
+            List<ClassLoader> matchedClassLoaders = ClassLoaderUtils.getClassLoaderByClassName(inst, classLoaderClass);
+            if (matchedClassLoaders.size() == 1) {
+                hashCode = Integer.toHexString(matchedClassLoaders.get(0).hashCode());
+            } else if (matchedClassLoaders.size() > 1) {
+                Collection<ClassLoaderVO> classLoaderVOList = ClassUtils.createClassLoaderVOList(matchedClassLoaders);
+                SearchMethodModel searchmethodModel = new SearchMethodModel()
+                        .setClassLoaderClass(classLoaderClass)
+                        .setMatchedClassLoaders(classLoaderVOList);
+                process.appendResult(searchmethodModel);
+                process.end(-1, "Found more than one classloader by class name, please specify classloader with '-c <classloader hash>'");
+                return;
+            } else {
+                process.end(-1, "Can not find classloader by class name: " + classLoaderClass + ".");
+                return;
+            }
+        }
+
+        Set<Class<?>> matchedClasses = SearchUtils.searchClass(inst, classPattern, isRegEx, hashCode);
+
+        if (numberOfLimit > 0 && matchedClasses.size() > numberOfLimit) {
+            process.end(-1, "The number of matching classes is greater than : " + numberOfLimit+". \n" +
+                    "Please specify a more accurate 'class-patten' or use the parameter '-n' to change the maximum number of matching classes.");
+            return;
+        }
+        for (Class<?> clazz : matchedClasses) {
+            try {
+                for (Constructor<?> constructor : clazz.getDeclaredConstructors()) {
+                    if (!methodNameMatcher.matching("<init>")) {
+                        continue;
+                    }
+
+                    MethodVO methodInfo = ClassUtils.createMethodInfo(constructor, clazz, isDetail);
+                    process.appendResult(new SearchMethodModel(methodInfo, isDetail));
+                    affect.rCnt(1);
+                }
+
+                for (Method method : clazz.getDeclaredMethods()) {
+                    if (!methodNameMatcher.matching(method.getName())) {
+                        continue;
+                    }
+                    MethodVO methodInfo = ClassUtils.createMethodInfo(method, clazz, isDetail);
+                    process.appendResult(new SearchMethodModel(methodInfo, isDetail));
+                    affect.rCnt(1);
+                }
+            } catch (Error e) {
+                //print failed className
+                String msg = String.format("process class failed: %s, error: %s", clazz.getName(), e.toString());
+                logger.error(msg, e);
+                process.end(1, msg);
+                return;
+            }
+        }
+
+        process.appendResult(new RowAffectModel(affect));
+        process.end();
+    }
+
+    private Matcher<String> methodNameMatcher() {
+        // auto fix default methodPattern
+        if (StringUtils.isBlank(methodPattern)) {
+            methodPattern = isRegEx ? ".*" : "*";
+        }
+        return isRegEx ? new RegexMatcher(methodPattern) : new WildcardMatcher(methodPattern);
+    }
+
+    @Override
+    public void complete(Completion completion) {
+        int argumentIndex = CompletionUtils.detectArgumentIndex(completion);
+
+        if (argumentIndex == 1) {
+            if (!CompletionUtils.completeClassName(completion)) {
+                super.complete(completion);
+            }
+            return;
+        } else if (argumentIndex == 2) {
+            if (!CompletionUtils.completeMethodName(completion)) {
+                super.complete(completion);
+            }
+            return;
+        }
+
+        super.complete(completion);
+    }
+}

core/src/main/java/com/taobao/arthas/core/command/logger/AsmRenameUtil.java

+package com.taobao.arthas.core.command.logger;
+
+import com.alibaba.deps.org.objectweb.asm.ClassReader;
+import com.alibaba.deps.org.objectweb.asm.ClassVisitor;
+import com.alibaba.deps.org.objectweb.asm.ClassWriter;
+import com.alibaba.deps.org.objectweb.asm.commons.ClassRemapper;
+import com.alibaba.deps.org.objectweb.asm.commons.SimpleRemapper;
+
+/**
+ * 
+ * @author hengyunabc 2019-09-23
+ *
+ */
+public class AsmRenameUtil {
+
+    public static byte[] renameClass(byte[] bytes, final String oldName, final String newName) {
+        ClassReader reader = new ClassReader(bytes);
+        ClassWriter writer = new ClassWriter(reader, 0);
+
+        final String internalOldName = oldName.replace('.', '/');
+        final String internalNewName = newName.replace('.', '/');
+//        ClassVisitor visitor = new ClassRemapper(writer, new Remapper() {
+//
+//            @Override
+//            public String mapType(String internalName) {
+//                if (internalName.equals(internalOldName)) {
+//                    return internalNewName;
+//                } else {
+//                    return super.mapType(internalName);
+//                }
+//            }
+//
+//        });
+        
+        ClassVisitor visitor = new ClassRemapper(writer, new SimpleRemapper(internalOldName, internalNewName));
+        
+        
+        reader.accept(visitor, 0);
+        return writer.toByteArray();
+    }
+
+}

core/src/main/java/com/taobao/arthas/core/command/logger/Log4j2Helper.java

+package com.taobao.arthas.core.command.logger;
+
+import java.lang.reflect.Field;
+import java.security.CodeSource;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import org.apache.logging.log4j.Level;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.core.Appender;
+import org.apache.logging.log4j.core.LoggerContext;
+import org.apache.logging.log4j.core.appender.AsyncAppender;
+import org.apache.logging.log4j.core.appender.ConsoleAppender;
+import org.apache.logging.log4j.core.appender.FileAppender;
+import org.apache.logging.log4j.core.config.Configuration;
+import org.apache.logging.log4j.core.config.LoggerConfig;
+
+/**
+ * 
+ * @author hengyunabc 2019-09-20
+ *
+ */
+public class Log4j2Helper {
+    private static boolean Log4j2 = false;
+    private static Field configField = null;
+
+    static {
+        try {
+            Class<?> loggerClass = Log4j2Helper.class.getClassLoader().loadClass("org.apache.logging.log4j.Logger");
+            // 这里可能会加载到其它上游ClassLoader的log4j2，因此需要判断是否当前classloader
+            if (loggerClass.getClassLoader().equals(Log4j2Helper.class.getClassLoader())) {
+                Log4j2 = true;
+            }
+
+            try {
+                configField = LoggerConfig.class.getDeclaredField("config");
+                configField.setAccessible(true);
+            } catch (Throwable e) {
+                // ignore
+            }
+        } catch (Throwable t) {
+        }
+    }
+
+    public static boolean hasLength(String str) {
+        return (str != null && !str.isEmpty());
+    }
+
+    private static LoggerConfig getLoggerConfig(String name) {
+        if (!hasLength(name) || LoggerConfig.ROOT.equalsIgnoreCase(name)) {
+            name = LogManager.ROOT_LOGGER_NAME;
+        }
+        return getLoggerContext().getConfiguration().getLoggers().get(name);
+    }
+
+    private static LoggerContext getLoggerContext() {
+        return (LoggerContext) LogManager.getContext(false);
+    }
+
+    public static Boolean updateLevel(String loggerName, String logLevel) {
+        if (Log4j2) {
+            Level level = Level.getLevel(logLevel.toUpperCase());
+            if (level == null) {
+                return null;
+            }
+            LoggerConfig loggerConfig = getLoggerConfig(loggerName);
+            if (loggerConfig == null) {
+                loggerConfig = new LoggerConfig(loggerName, level, true);
+                getLoggerContext().getConfiguration().addLogger(loggerName, loggerConfig);
+            } else {
+                loggerConfig.setLevel(level);
+            }
+            getLoggerContext().updateLoggers();
+            return Boolean.TRUE;
+        }
+        return null;
+    }
+
+    public static Map<String, Map<String, Object>> getLoggers(String name, boolean includeNoAppender) {
+        Map<String, Map<String, Object>> loggerInfoMap = new HashMap<String, Map<String, Object>>();
+        if (!Log4j2) {
+            return loggerInfoMap;
+        }
+
+        Configuration configuration = getLoggerContext().getConfiguration();
+
+        if (name != null && !name.trim().isEmpty()) {
+            LoggerConfig loggerConfig = configuration.getLoggerConfig(name);
+            if (loggerConfig == null) {
+                return loggerInfoMap;
+            }
+            // 排掉非root时，获取到root的logger config
+            if (!name.equalsIgnoreCase(LoggerConfig.ROOT) && isEmpty(loggerConfig.getName())) {
+                return loggerInfoMap;
+            }
+            loggerInfoMap.put(name, doGetLoggerInfo(loggerConfig));
+        } else {
+            // 获取所有logger时，如果没有appender则忽略
+            Map<String, LoggerConfig> loggers = configuration.getLoggers();
+            if (loggers != null) {
+                for (Entry<String, LoggerConfig> entry : loggers.entrySet()) {
+                    LoggerConfig loggerConfig = entry.getValue();
+                    if (!includeNoAppender) {
+                        if (!loggerConfig.getAppenders().isEmpty()) {
+                            loggerInfoMap.put(entry.getKey(), doGetLoggerInfo(entry.getValue()));
+                        }
+                    } else {
+                        loggerInfoMap.put(entry.getKey(), doGetLoggerInfo(entry.getValue()));
+                    }
+                }
+            }
+        }
+
+        return loggerInfoMap;
+    }
+
+    private static Object getConfigField(LoggerConfig loggerConfig) {
+        try {
+            if (configField != null) {
+                return configField.get(loggerConfig);
+            }
+        } catch (Throwable e) {
+            // ignore
+        }
+        return null;
+    }
+
+    private static Map<String, Object> doGetLoggerInfo(LoggerConfig loggerConfig) {
+        Map<String, Object> info = new HashMap<String, Object>();
+
+        String name = loggerConfig.getName();
+        if (name == null || name.trim().isEmpty()) {
+            name = LoggerConfig.ROOT;
+        }
+
+        info.put(LoggerHelper.name, name);
+        info.put(LoggerHelper.clazz, loggerConfig.getClass());
+        CodeSource codeSource = loggerConfig.getClass().getProtectionDomain().getCodeSource();
+        if (codeSource != null) {
+            info.put(LoggerHelper.codeSource, codeSource.getLocation());
+        }
+        Object config = getConfigField(loggerConfig);
+        if (config != null) {
+            info.put(LoggerHelper.config, config);
+        }
+
+        info.put(LoggerHelper.additivity, loggerConfig.isAdditive());
+
+        Level level = loggerConfig.getLevel();
+        if (level != null) {
+            info.put(LoggerHelper.level, level.toString());
+        }
+
+        List<Map<String, Object>> result = doGetLoggerAppenders(loggerConfig);
+        info.put(LoggerHelper.appenders, result);
+        return info;
+    }
+
+    private static List<Map<String, Object>> doGetLoggerAppenders(LoggerConfig loggerConfig) {
+        List<Map<String, Object>> result = new ArrayList<Map<String, Object>>();
+
+        Map<String, Appender> appenders = loggerConfig.getAppenders();
+
+        for (Entry<String, Appender> entry : appenders.entrySet()) {
+            Map<String, Object> info = new HashMap<String, Object>();
+            Appender appender = entry.getValue();
+            info.put(LoggerHelper.name, appender.getName());
+            info.put(LoggerHelper.clazz, appender.getClass());
+
+            result.add(info);
+            if (appender instanceof FileAppender) {
+                info.put(LoggerHelper.file, ((FileAppender) appender).getFileName());
+            } else if (appender instanceof ConsoleAppender) {
+                info.put(LoggerHelper.target, ((ConsoleAppender) appender).getTarget());
+            } else if (appender instanceof AsyncAppender) {
+
+                AsyncAppender asyncAppender = ((AsyncAppender) appender);
+                String[] appenderRefStrings = asyncAppender.getAppenderRefStrings();
+
+                info.put(LoggerHelper.blocking, asyncAppender.isBlocking());
+                info.put(LoggerHelper.appenderRef, Arrays.asList(appenderRefStrings));
+            }
+        }
+        return result;
+    }
+
+    private static boolean isEmpty(Object str) {
+        return str == null || "".equals(str);
+    }
+}

core/src/main/java/com/taobao/arthas/core/command/logger/Log4jHelper.java

+package com.taobao.arthas.core.command.logger;
+
+import java.security.CodeSource;
+import java.util.ArrayList;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.log4j.Appender;
+import org.apache.log4j.AsyncAppender;
+import org.apache.log4j.ConsoleAppender;
+import org.apache.log4j.FileAppender;
+import org.apache.log4j.Level;
+import org.apache.log4j.LogManager;
+import org.apache.log4j.Logger;
+
+/**
+ * 
+ * @author hengyunabc 2019-09-06
+ *
+ */
+public class Log4jHelper {
+
+    private static boolean Log4j = false;
+
+    static {
+        try {
+            Class<?> loggerClass = Log4jHelper.class.getClassLoader().loadClass("org.apache.log4j.Logger");
+            // 这里可能会加载到其它上游ClassLoader的log4j，因此需要判断是否当前classloader
+            if (loggerClass.getClassLoader().equals(Log4jHelper.class.getClassLoader())) {
+                Log4j = true;
+            }
+        } catch (Throwable t) {
+        }
+    }
+
+    public static Boolean updateLevel(String name, String level) {
+        if (Log4j) {
+            Level l = Level.toLevel(level, Level.ERROR);
+            Logger logger = LogManager.getLoggerRepository().exists(name);
+            if (logger != null) {
+                logger.setLevel(l);
+                return true;
+            } else {
+                Logger root = LogManager.getLoggerRepository().getRootLogger();
+                if (root.getName().equals(name)) {
+                    root.setLevel(l);
+                    return true;
+                }
+            }
+            return false;
+        }
+        return null;
+    }
+
+    public static Map<String, Map<String, Object>> getLoggers(String name, boolean includeNoAppender) {
+        Map<String, Map<String, Object>> loggerInfoMap = new HashMap<String, Map<String, Object>>();
+        if (!Log4j) {
+            return loggerInfoMap;
+        }
+
+        if (name != null && !name.trim().isEmpty()) {
+            Logger logger = LogManager.getLoggerRepository().exists(name);
+            if (logger != null) {
+                loggerInfoMap.put(name, doGetLoggerInfo(logger));
+            }
+        } else {
+            // 获取所有logger时，如果没有appender则忽略
+            @SuppressWarnings("unchecked")
+            Enumeration<Logger> loggers = LogManager.getLoggerRepository().getCurrentLoggers();
+
+            if (loggers != null) {
+                while (loggers.hasMoreElements()) {
+                    Logger logger = loggers.nextElement();
+                    Map<String, Object> info = doGetLoggerInfo(logger);
+                    if (!includeNoAppender) {
+                        List<?> appenders = (List<?>) info.get(LoggerHelper.appenders);
+                        if (appenders != null && !appenders.isEmpty()) {
+                            loggerInfoMap.put(logger.getName(), info);
+                        }
+                    } else {
+                        loggerInfoMap.put(logger.getName(), info);
+                    }
+                }
+            }
+
+            Logger root = LogManager.getLoggerRepository().getRootLogger();
+            if (root != null) {
+                Map<String, Object> info = doGetLoggerInfo(root);
+                if (!includeNoAppender) {
+                    List<?> appenders = (List<?>) info.get(LoggerHelper.appenders);
+                    if (appenders != null && !appenders.isEmpty()) {
+                        loggerInfoMap.put(root.getName(), info);
+                    }
+                } else {
+                    loggerInfoMap.put(root.getName(), info);
+                }
+            }
+        }
+
+        return loggerInfoMap;
+    }
+
+    private static Map<String, Object> doGetLoggerInfo(Logger logger) {
+        Map<String, Object> info = new HashMap<String, Object>();
+        info.put(LoggerHelper.name, logger.getName());
+        info.put(LoggerHelper.clazz, logger.getClass());
+        CodeSource codeSource = logger.getClass().getProtectionDomain().getCodeSource();
+        if (codeSource != null) {
+            info.put(LoggerHelper.codeSource, codeSource.getLocation());
+        }
+        info.put(LoggerHelper.additivity, logger.getAdditivity());
+
+        Level level = logger.getLevel(), effectiveLevel = logger.getEffectiveLevel();
+        if (level != null) {
+            info.put(LoggerHelper.level, level.toString());
+        }
+        if (effectiveLevel != null) {
+            info.put(LoggerHelper.effectiveLevel, effectiveLevel.toString());
+        }
+
+        @SuppressWarnings("unchecked")
+        List<Map<String, Object>> result = doGetLoggerAppenders(logger.getAllAppenders());
+        info.put(LoggerHelper.appenders, result);
+        return info;
+    }
+
+    private static List<Map<String, Object>> doGetLoggerAppenders(Enumeration<Appender> appenders) {
+        List<Map<String, Object>> result = new ArrayList<Map<String, Object>>();
+
+        if (appenders == null) {
+            return result;
+        }
+
+        while (appenders.hasMoreElements()) {
+            Map<String, Object> info = new HashMap<String, Object>();
+            Appender appender = appenders.nextElement();
+
+            info.put(LoggerHelper.name, appender.getName());
+            info.put(LoggerHelper.clazz, appender.getClass());
+
+            result.add(info);
+            if (appender instanceof FileAppender) {
+                info.put(LoggerHelper.file, ((FileAppender) appender).getFile());
+            } else if (appender instanceof ConsoleAppender) {
+                info.put(LoggerHelper.target, ((ConsoleAppender) appender).getTarget());
+            } else if (appender instanceof AsyncAppender) {
+                @SuppressWarnings("unchecked")
+                Enumeration<Appender> appendersOfAsync = ((AsyncAppender) appender).getAllAppenders();
+                if (appendersOfAsync != null) {
+                    List<Map<String, Object>> asyncs = doGetLoggerAppenders(appendersOfAsync);
+                    // 标明异步appender
+                    List<String> appenderRef = new ArrayList<String>();
+                    for (Map<String, Object> a : asyncs) {
+                        appenderRef.add((String) a.get(LoggerHelper.name));
+                        result.add(a);
+                    }
+                    info.put(LoggerHelper.blocking, ((AsyncAppender) appender).getBlocking());
+                    info.put(LoggerHelper.appenderRef, appenderRef);
+                }
+            }
+        }
+
+        return result;
+    }
+
+}

core/src/main/java/com/taobao/arthas/core/command/logger/LogbackHelper.java

+package com.taobao.arthas.core.command.logger;
+
+import java.lang.reflect.Field;
+import java.security.CodeSource;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.slf4j.ILoggerFactory;
+
+import ch.qos.logback.classic.AsyncAppender;
+import ch.qos.logback.classic.Level;
+import ch.qos.logback.classic.Logger;
+import ch.qos.logback.classic.LoggerContext;
+import ch.qos.logback.classic.pattern.ThrowableProxyConverter;
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import ch.qos.logback.core.Appender;
+import ch.qos.logback.core.ConsoleAppender;
+import ch.qos.logback.core.FileAppender;
+import ch.qos.logback.core.pattern.PatternLayoutBase;
+
+/**
+ * 
+ * @author hengyunabc 2019-09-06
+ *
+ */
+public class LogbackHelper {
+
+    private static boolean Logback = false;
+    private static Field headField, lengthOptionField;
+    private static ILoggerFactory loggerFactoryInstance;
+
+    static {
+        try {
+            Class<?> loggerClass = LogbackHelper.class.getClassLoader().loadClass("ch.qos.logback.classic.Logger");
+            // 这里可能会加载到应用中依赖的logback，因此需要判断classloader
+            if (loggerClass.getClassLoader().equals(LogbackHelper.class.getClassLoader())) {
+                ILoggerFactory loggerFactory = org.slf4j.LoggerFactory.getILoggerFactory();
+
+                if (loggerFactory instanceof LoggerContext) {
+                    loggerFactoryInstance = loggerFactory;
+
+                    headField = PatternLayoutBase.class.getDeclaredField("head");
+                    headField.setAccessible(true);
+
+                    lengthOptionField = ThrowableProxyConverter.class.getDeclaredField("lengthOption");
+                    lengthOptionField.setAccessible(true);
+
+                    Logback = true;
+                }
+            }
+        } catch (Throwable t) {
+            // ignore
+        }
+    }
+
+    public static Boolean updateLevel(String name, String level) {
+        if (Logback) {
+            try {
+                Level l = Level.toLevel(level, Level.ERROR);
+                LoggerContext loggerContext = (LoggerContext) loggerFactoryInstance;
+
+                Logger logger = loggerContext.exists(name);
+                if (logger != null) {
+                    logger.setLevel(l);
+                    return true;
+                }
+            } catch (Throwable t) {
+                // ignore
+            }
+            return false;
+        }
+        return null;
+    }
+
+    public static Map<String, Map<String, Object>> getLoggers(String name, boolean includeNoAppender) {
+        Map<String, Map<String, Object>> loggerInfoMap = new LinkedHashMap<String, Map<String, Object>>();
+
+        if (Logback) {
+            LoggerContext loggerContext = (LoggerContext) loggerFactoryInstance;
+            if (name != null && !name.trim().isEmpty()) {
+                Logger logger = loggerContext.exists(name);
+                if (logger != null) {
+                    loggerInfoMap.put(name, doGetLoggerInfo(logger));
+                }
+            } else {
+                // 获取所有logger时，如果没有appender则忽略
+                List<Logger> loggers = loggerContext.getLoggerList();
+                for (Logger logger : loggers) {
+                    Map<String, Object> info = doGetLoggerInfo(logger);
+
+                    if (!includeNoAppender) {
+                        List<?> appenders = (List<?>) info.get(LoggerHelper.appenders);
+                        if (appenders != null && !appenders.isEmpty()) {
+                            loggerInfoMap.put(logger.getName(), info);
+                        }
+                    } else {
+                        loggerInfoMap.put(logger.getName(), info);
+                    }
+
+                }
+            }
+        }
+
+        return loggerInfoMap;
+    }
+
+    private static Map<String, Object> doGetLoggerInfo(Logger logger) {
+        Map<String, Object> info = new LinkedHashMap<String, Object>();
+        info.put(LoggerHelper.name, logger.getName());
+        info.put(LoggerHelper.clazz, logger.getClass());
+        CodeSource codeSource = logger.getClass().getProtectionDomain().getCodeSource();
+        if (codeSource != null) {
+            info.put(LoggerHelper.codeSource, codeSource.getLocation());
+        }
+        info.put(LoggerHelper.additivity, logger.isAdditive());
+
+        Level level = logger.getLevel(), effectiveLevel = logger.getEffectiveLevel();
+        if (level != null) {
+            info.put(LoggerHelper.level, level.toString());
+        }
+        if (effectiveLevel != null) {
+            info.put(LoggerHelper.effectiveLevel, effectiveLevel.toString());
+        }
+
+        List<Map<String, Object>> result = doGetLoggerAppenders(logger.iteratorForAppenders());
+        info.put(LoggerHelper.appenders, result);
+        return info;
+    }
+
+    @SuppressWarnings("rawtypes")
+    private static List<Map<String, Object>> doGetLoggerAppenders(Iterator<Appender<ILoggingEvent>> appenders) {
+        List<Map<String, Object>> result = new ArrayList<Map<String, Object>>();
+
+        while (appenders.hasNext()) {
+            Map<String, Object> info = new LinkedHashMap<String, Object>();
+            Appender<ILoggingEvent> appender = appenders.next();
+            info.put(LoggerHelper.name, appender.getName());
+            info.put(LoggerHelper.clazz, appender.getClass());
+            if (appender instanceof FileAppender) {
+                info.put(LoggerHelper.file, ((FileAppender) appender).getFile());
+            } else if (appender instanceof AsyncAppender) {
+                AsyncAppender aa = (AsyncAppender) appender;
+                Iterator<Appender<ILoggingEvent>> iter = aa.iteratorForAppenders();
+                List<Map<String, Object>> asyncs = doGetLoggerAppenders(iter);
+
+                // 异步appender所 ref的 appender，参考： https://logback.qos.ch/manual/appenders.html
+                List<String> appenderRef = new ArrayList<String>();
+                for (Map<String, Object> a : asyncs) {
+                    appenderRef.add((String) a.get(LoggerHelper.name));
+                    result.add(a);
+                }
+                info.put(LoggerHelper.appenderRef, appenderRef);
+                info.put(LoggerHelper.blocking, !aa.isNeverBlock());
+            } else if (appender instanceof ConsoleAppender) {
+                info.put(LoggerHelper.target, ((ConsoleAppender) appender).getTarget());
+            }
+            result.add(info);
+        }
+
+        return result;
+    }
+}

core/src/main/java/com/taobao/arthas/core/command/logger/LoggerCommand.java

+package com.taobao.arthas.core.command.logger;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.lang.instrument.Instrumentation;
+import java.lang.reflect.Method;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Set;
+
+import com.alibaba.arthas.deps.org.slf4j.Logger;
+import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
+import com.taobao.arthas.common.IOUtils;
+import com.taobao.arthas.common.ReflectUtils;
+import com.taobao.arthas.core.command.Constants;
+import com.taobao.arthas.core.command.model.LoggerModel;
+import com.taobao.arthas.core.command.model.ClassLoaderVO;
+import com.taobao.arthas.core.shell.command.AnnotatedCommand;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+import com.taobao.arthas.core.util.ClassUtils;
+import com.taobao.arthas.core.util.ClassLoaderUtils;
+import com.taobao.arthas.core.util.StringUtils;
+import com.taobao.middleware.cli.annotations.Description;
+import com.taobao.middleware.cli.annotations.Name;
+import com.taobao.middleware.cli.annotations.Option;
+import com.taobao.middleware.cli.annotations.Summary;
+
+/**
+ * logger command
+ *
+ * @author hengyunabc 2019-09-04
+ */
+//@formatter:off
+@Name("logger")
+@Summary("Print logger info, and update the logger level")
+@Description("\nExamples:\n"
+                + "  logger\n"
+                + "  logger -c 327a647b\n"
+                + "  logger -c 327a647b --name ROOT --level debug\n"
+                + "  logger --include-no-appender\n"
+                + Constants.WIKI + Constants.WIKI_HOME + "logger")
+//@formatter:on
+public class LoggerCommand extends AnnotatedCommand {
+    private static final Logger logger = LoggerFactory.getLogger(LoggerCommand.class);
+
+    private static byte[] LoggerHelperBytes;
+    private static byte[] Log4jHelperBytes;
+    private static byte[] LogbackHelperBytes;
+    private static byte[] Log4j2HelperBytes;
+
+    private static Map<Class<?>, byte[]> classToBytesMap = new HashMap<Class<?>, byte[]>();
+
+    private static String arthasClassLoaderHash = ClassLoaderUtils
+            .classLoaderHash(LoggerCommand.class.getClassLoader());
+
+    static {
+        LoggerHelperBytes = loadClassBytes(LoggerHelper.class);
+        Log4jHelperBytes = loadClassBytes(Log4jHelper.class);
+        LogbackHelperBytes = loadClassBytes(LogbackHelper.class);
+        Log4j2HelperBytes = loadClassBytes(Log4j2Helper.class);
+
+        classToBytesMap.put(LoggerHelper.class, LoggerHelperBytes);
+        classToBytesMap.put(Log4jHelper.class, Log4jHelperBytes);
+        classToBytesMap.put(LogbackHelper.class, LogbackHelperBytes);
+        classToBytesMap.put(Log4j2Helper.class, Log4j2HelperBytes);
+    }
+
+    private String name;
+
+    private String hashCode;
+    private String classLoaderClass;
+
+    private String level;
+
+    /**
+     * include the loggers which don't have appenders, default false.
+     */
+    private boolean includeNoAppender;
+
+    @Option(shortName = "n", longName = "name")
+    @Description("logger name")
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Option(shortName = "c", longName = "classloader")
+    @Description("classLoader hashcode, if no value is set, default value is SystemClassLoader")
+    public void setHashCode(String hashCode) {
+        this.hashCode = hashCode;
+    }
+
+    @Option(longName = "classLoaderClass")
+    @Description("The class name of the special class's classLoader.")
+    public void setClassLoaderClass(String classLoaderClass) {
+        this.classLoaderClass = classLoaderClass;
+    }
+
+    @Option(shortName = "l", longName = "level")
+    @Description("set logger level")
+    public void setLevel(String level) {
+        this.level = level;
+    }
+
+    @Option(longName = "include-no-appender", flag = true)
+    @Description("include the loggers which don't have appenders, default value false")
+    public void setHaveAppender(boolean includeNoAppender) {
+        this.includeNoAppender = includeNoAppender;
+    }
+
+    @Override
+    public void process(CommandProcess process) {
+        // 每个分支中调用process.end()结束执行
+        if (this.name != null && this.level != null) {
+            level(process);
+        } else {
+            loggers(process);
+        }
+    }
+
+    public void level(CommandProcess process) {
+        Instrumentation inst = process.session().getInstrumentation();
+        boolean result = false;
+        try {
+            Boolean updateResult = this.updateLevel(inst, Log4jHelper.class);
+            if (Boolean.TRUE.equals(updateResult)) {
+                result = true;
+            }
+        } catch (Throwable e) {
+            logger.error("logger command update log4j level error", e);
+        }
+
+        try {
+            Boolean updateResult = this.updateLevel(inst, LogbackHelper.class);
+            if (Boolean.TRUE.equals(updateResult)) {
+                result = true;
+            }
+        } catch (Throwable e) {
+            logger.error("logger command update logback level error", e);
+        }
+
+        try {
+            Boolean updateResult = this.updateLevel(inst, Log4j2Helper.class);
+            if (Boolean.TRUE.equals(updateResult)) {
+                result = true;
+            }
+        } catch (Throwable e) {
+            logger.error("logger command update log4j2 level error", e);
+        }
+
+        if (result) {
+            process.end(0, "Update logger level success.");
+        } else {
+            process.end(-1, "Update logger level fail. Try to specify the classloader with the -c option. Use `sc -d CLASSNAME` to find out the classloader hashcode.");
+        }
+    }
+
+    public void loggers(CommandProcess process) {
+        Map<ClassLoader, LoggerTypes> classLoaderLoggerMap = new LinkedHashMap<ClassLoader, LoggerTypes>();
+
+        for (Class<?> clazz : process.session().getInstrumentation().getAllLoadedClasses()) {
+            String className = clazz.getName();
+            ClassLoader classLoader = clazz.getClassLoader();
+
+        if (hashCode == null && classLoaderClass != null) {
+            Instrumentation inst = process.session().getInstrumentation();
+            List<ClassLoader> matchedClassLoaders = ClassLoaderUtils.getClassLoaderByClassName(inst, classLoaderClass);
+            if (matchedClassLoaders.size() == 1) {
+                hashCode = Integer.toHexString(matchedClassLoaders.get(0).hashCode());
+            } else if (matchedClassLoaders.size() > 1) {
+                Collection<ClassLoaderVO> classLoaderVOList = ClassUtils.createClassLoaderVOList(matchedClassLoaders);
+                LoggerModel loggerModel = new LoggerModel()
+                        .setClassLoaderClass(classLoaderClass)
+                        .setMatchedClassLoaders(classLoaderVOList);
+                process.appendResult(loggerModel);
+                process.end(-1, "Found more than one classloader by class name, please specify classloader with '-c <classloader hash>'");
+                return;
+            } else {
+                process.end(-1, "Can not find classloader by class name: " + classLoaderClass + ".");
+                return;
+            }
+        }
+
+            // if special classloader
+            if (this.hashCode != null && !this.hashCode.equals(StringUtils.classLoaderHash(clazz))) {
+                continue;
+            }
+
+            if (classLoader != null) {
+                LoggerTypes loggerTypes = classLoaderLoggerMap.get(classLoader);
+                if (loggerTypes == null) {
+                    loggerTypes = new LoggerTypes();
+                    classLoaderLoggerMap.put(classLoader, loggerTypes);
+                }
+                if ("org.apache.log4j.Logger".equals(className)) {
+                    loggerTypes.addType(LoggerType.LOG4J);
+                } else if ("ch.qos.logback.classic.Logger".equals(className)) {
+                    loggerTypes.addType(LoggerType.LOGBACK);
+                } else if ("org.apache.logging.log4j.Logger".equals(className)) {
+                    loggerTypes.addType(LoggerType.LOG4J2);
+                }
+            }
+        }
+
+        for (Entry<ClassLoader, LoggerTypes> entry : classLoaderLoggerMap.entrySet()) {
+            ClassLoader classLoader = entry.getKey();
+            LoggerTypes loggerTypes = entry.getValue();
+
+            if (loggerTypes.contains(LoggerType.LOG4J)) {
+                Map<String, Map<String, Object>> loggerInfoMap = loggerInfo(classLoader, Log4jHelper.class);
+                process.appendResult(new LoggerModel(loggerInfoMap));
+            }
+
+            if (loggerTypes.contains(LoggerType.LOGBACK)) {
+                Map<String, Map<String, Object>> loggerInfoMap = loggerInfo(classLoader, LogbackHelper.class);
+                process.appendResult(new LoggerModel(loggerInfoMap));
+            }
+
+            if (loggerTypes.contains(LoggerType.LOG4J2)) {
+                Map<String, Map<String, Object>> loggerInfoMap = loggerInfo(classLoader, Log4j2Helper.class);
+                process.appendResult(new LoggerModel(loggerInfoMap));
+            }
+        }
+
+        process.end();
+    }
+
+    private static String helperClassNameWithClassLoader(ClassLoader classLoader, Class<?> helperClass) {
+        String classLoaderHash = ClassLoaderUtils.classLoaderHash(classLoader);
+        String className = helperClass.getName();
+        // if want to debug, change to return className
+        return className + arthasClassLoaderHash + classLoaderHash;
+    }
+
+    @SuppressWarnings("unchecked")
+    private Map<String, Map<String, Object>> loggerInfo(ClassLoader classLoader, Class<?> helperClass) {
+        Map<String, Map<String, Object>> loggers = Collections.emptyMap();
+
+        String helperClassName = helperClassNameWithClassLoader(classLoader, helperClass);
+        try {
+            classLoader.loadClass(helperClassName);
+        } catch (ClassNotFoundException e) {
+            try {
+                byte[] helperClassBytes = AsmRenameUtil.renameClass(classToBytesMap.get(helperClass),
+                        helperClass.getName(), helperClassName);
+                ReflectUtils.defineClass(helperClassName, helperClassBytes, classLoader);
+            } catch (Throwable e1) {
+                logger.error("arthas loggger command try to define helper class error: " + helperClassName,
+                        e1);
+            }
+        }
+
+        try {
+            Class<?> clazz = classLoader.loadClass(helperClassName);
+            Method getLoggersMethod = clazz.getMethod("getLoggers", new Class<?>[]{String.class, boolean.class});
+            loggers = (Map<String, Map<String, Object>>) getLoggersMethod.invoke(null,
+                    new Object[]{name, includeNoAppender});
+        } catch (Throwable e) {
+            // ignore
+        }
+
+        //expose attributes to json: classloader, classloaderHash
+        for (Map<String, Object> loggerInfo : loggers.values()) {
+            Class clazz = (Class) loggerInfo.get(LoggerHelper.clazz);
+            loggerInfo.put(LoggerHelper.classLoader, getClassLoaderName(clazz.getClassLoader()));
+            loggerInfo.put(LoggerHelper.classLoaderHash, StringUtils.classLoaderHash(clazz));
+
+            List<Map<String, Object>> appenders = (List<Map<String, Object>>) loggerInfo.get(LoggerHelper.appenders);
+            for (Map<String, Object> appenderInfo : appenders) {
+                Class appenderClass = (Class) appenderInfo.get(LoggerHelper.clazz);
+                if (appenderClass != null) {
+                    appenderInfo.put(LoggerHelper.classLoader, getClassLoaderName(appenderClass.getClassLoader()));
+                    appenderInfo.put(LoggerHelper.classLoaderHash, StringUtils.classLoaderHash(appenderClass));
+                }
+            }
+        }
+
+        return loggers;
+    }
+
+    private String getClassLoaderName(ClassLoader classLoader) {
+        return classLoader == null ? null : classLoader.toString();
+    }
+
+    private Boolean updateLevel(Instrumentation inst, Class<?> helperClass) throws Exception {
+        ClassLoader classLoader = null;
+        if (hashCode == null) {
+            classLoader = ClassLoader.getSystemClassLoader();
+        } else {
+            classLoader = ClassLoaderUtils.getClassLoader(inst, hashCode);
+        }
+
+        Class<?> clazz = classLoader.loadClass(helperClassNameWithClassLoader(classLoader, helperClass));
+        Method updateLevelMethod = clazz.getMethod("updateLevel", new Class<?>[]{String.class, String.class});
+        return (Boolean) updateLevelMethod.invoke(null, new Object[]{this.name, this.level});
+
+    }
+
+    static enum LoggerType {
+        LOG4J, LOGBACK, LOG4J2
+    }
+
+    static class LoggerTypes {
+        Set<LoggerType> types = new HashSet<LoggerType>();
+
+        public Collection<LoggerType> types() {
+            return types;
+        }
+
+        public void addType(LoggerType type) {
+            types.add(type);
+        }
+
+        public boolean contains(LoggerType type) {
+            return types.contains(type);
+        }
+    }
+
+    private static byte[] loadClassBytes(Class<?> clazz) {
+        try {
+            InputStream stream = LoggerCommand.class.getClassLoader()
+                    .getResourceAsStream(clazz.getName().replace('.', '/') + ".class");
+
+            return IOUtils.getBytes(stream);
+        } catch (IOException e) {
+            // ignore
+            return null;
+        }
+    }
+}

core/src/main/java/com/taobao/arthas/core/command/logger/LoggerHelper.java

+package com.taobao.arthas.core.command.logger;
+
+/**
+ * 
+ * @author hengyunabc 2019-09-06
+ *
+ */
+public interface LoggerHelper {
+    public static final String clazz = "class";
+    public static final String classLoader = "classLoader";
+    public static final String classLoaderHash = "classLoaderHash";
+    public static final String codeSource = "codeSource";
+
+    // logger info
+    public static final String level = "level";
+    public static final String effectiveLevel = "effectiveLevel";
+
+    // log4j2 only
+    public static final String config = "config";
+
+    // type boolean
+    public static final String additivity = "additivity";
+    public static final String appenders = "appenders";
+
+    // appender info
+    public static final String name = "name";
+    public static final String file = "file";
+    public static final String blocking = "blocking";
+    // type List<String>
+    public static final String appenderRef = "appenderRef";
+    public static final String target = "target";
+
+}

core/src/main/java/com/taobao/arthas/core/command/model/ArgumentVO.java

+package com.taobao.arthas.core.command.model;
+
+/**
+ * @author gongdewei 2020/4/3
+ */
+public class ArgumentVO {
+    private String argName;
+    private boolean required;
+    private boolean multiValued;
+
+    public ArgumentVO() {
+    }
+
+    public ArgumentVO(String argName, boolean required, boolean multiValued) {
+        this.argName = argName;
+        this.required = required;
+        this.multiValued = multiValued;
+    }
+
+    public String getArgName() {
+        return argName;
+    }
+
+    public void setArgName(String argName) {
+        this.argName = argName;
+    }
+
+    public boolean isRequired() {
+        return required;
+    }
+
+    public void setRequired(boolean required) {
+        this.required = required;
+    }
+
+    public boolean isMultiValued() {
+        return multiValued;
+    }
+
+    public void setMultiValued(boolean multiValued) {
+        this.multiValued = multiValued;
+    }
+}

core/src/main/java/com/taobao/arthas/core/command/model/Base64Model.java

+package com.taobao.arthas.core.command.model;
+
+/**
+ * 
+ * @author hengyunabc 2021-01-05
+ *
+ */
+public class Base64Model extends ResultModel {
+
+    private String content;
+
+    public Base64Model() {
+    }
+
+    public Base64Model(String content) {
+        this.content = content;
+    }
+
+    @Override
+    public String getType() {
+        return "base64";
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
+}

core/src/main/java/com/taobao/arthas/core/command/model/BlockingLockInfo.java

+package com.taobao.arthas.core.command.model;
+
+import java.lang.management.ThreadInfo;
+
+/**
+ * Thread blocking lock info, extract from ThreadUtil.
+ *
+ * @author gongdewei 2020/7/14
+ */
+public class BlockingLockInfo {
+
+    // the thread info that is holing this lock.
+    private ThreadInfo threadInfo = null;
+    // the associated LockInfo object
+    private int lockIdentityHashCode = 0;
+    // the number of thread that is blocked on this lock
+    private int blockingThreadCount = 0;
+
+    public BlockingLockInfo() {
+    }
+
+    public ThreadInfo getThreadInfo() {
+        return threadInfo;
+    }
+
+    public void setThreadInfo(ThreadInfo threadInfo) {
+        this.threadInfo = threadInfo;
+    }
+
+    public int getLockIdentityHashCode() {
+        return lockIdentityHashCode;
+    }
+
+    public void setLockIdentityHashCode(int lockIdentityHashCode) {
+        this.lockIdentityHashCode = lockIdentityHashCode;
+    }
+
+    public int getBlockingThreadCount() {
+        return blockingThreadCount;
+    }
+
+    public void setBlockingThreadCount(int blockingThreadCount) {
+        this.blockingThreadCount = blockingThreadCount;
+    }
+}

core/src/main/java/com/taobao/arthas/core/command/model/BusyThreadInfo.java

+package com.taobao.arthas.core.command.model;
+
+import java.lang.management.LockInfo;
+import java.lang.management.MonitorInfo;
+import java.lang.management.ThreadInfo;
+
+/**
+ * Busy thread info, include ThreadInfo fields
+ *
+ * @author gongdewei 2020/4/26
+ */
+public class BusyThreadInfo extends ThreadVO {
+
+    private long         blockedTime;
+    private long         blockedCount;
+    private long         waitedTime;
+    private long         waitedCount;
+    private LockInfo lockInfo;
+    private String       lockName;
+    private long         lockOwnerId;
+    private String       lockOwnerName;
+    private boolean      inNative;
+    private boolean      suspended;
+    private StackTraceElement[] stackTrace;
+    private MonitorInfo[]       lockedMonitors;
+    private LockInfo[]          lockedSynchronizers;
+
+
+    public BusyThreadInfo(ThreadVO thread, ThreadInfo threadInfo) {
+        this.setId(thread.getId());
+        this.setName(thread.getName());
+        this.setDaemon(thread.isDaemon());
+        this.setInterrupted(thread.isInterrupted());
+        this.setPriority(thread.getPriority());
+        this.setGroup(thread.getGroup());
+        this.setState(thread.getState());
+        this.setCpu(thread.getCpu());
+        this.setDeltaTime(thread.getDeltaTime());
+        this.setTime(thread.getTime());
+
+        //thread info
+        if (threadInfo != null) {
+            this.setLockInfo(threadInfo.getLockInfo());
+            this.setLockedMonitors(threadInfo.getLockedMonitors());
+            this.setLockedSynchronizers(threadInfo.getLockedSynchronizers());
+            this.setLockName(threadInfo.getLockName());
+            this.setLockOwnerId(threadInfo.getLockOwnerId());
+            this.setLockOwnerName(threadInfo.getLockOwnerName());
+            this.setStackTrace(threadInfo.getStackTrace());
+            this.setBlockedCount(threadInfo.getBlockedCount());
+            this.setBlockedTime(threadInfo.getBlockedTime());
+            this.setInNative(threadInfo.isInNative());
+            this.setSuspended(threadInfo.isSuspended());
+            this.setWaitedCount(threadInfo.getWaitedCount());
+            this.setWaitedTime(threadInfo.getWaitedTime());
+        }
+
+    }
+
+    public long getBlockedTime() {
+        return blockedTime;
+    }
+
+    public void setBlockedTime(long blockedTime) {
+        this.blockedTime = blockedTime;
+    }
+
+    public long getBlockedCount() {
+        return blockedCount;
+    }
+
+    public void setBlockedCount(long blockedCount) {
+        this.blockedCount = blockedCount;
+    }
+
+    public long getWaitedTime() {
+        return waitedTime;
+    }
+
+    public void setWaitedTime(long waitedTime) {
+        this.waitedTime = waitedTime;
+    }
+
+    public long getWaitedCount() {
+        return waitedCount;
+    }
+
+    public void setWaitedCount(long waitedCount) {
+        this.waitedCount = waitedCount;
+    }
+
+    public LockInfo getLockInfo() {
+        return lockInfo;
+    }
+
+    public void setLockInfo(LockInfo lockInfo) {
+        this.lockInfo = lockInfo;
+    }
+
+    public String getLockName() {
+        return lockName;
+    }
+
+    public void setLockName(String lockName) {
+        this.lockName = lockName;
+    }
+
+    public long getLockOwnerId() {
+        return lockOwnerId;
+    }
+
+    public void setLockOwnerId(long lockOwnerId) {
+        this.lockOwnerId = lockOwnerId;
+    }
+
+    public String getLockOwnerName() {
+        return lockOwnerName;
+    }
+
+    public void setLockOwnerName(String lockOwnerName) {
+        this.lockOwnerName = lockOwnerName;
+    }
+
+    public boolean isInNative() {
+        return inNative;
+    }
+
+    public void setInNative(boolean inNative) {
+        this.inNative = inNative;
+    }
+
+    public boolean isSuspended() {
+        return suspended;
+    }
+
+    public void setSuspended(boolean suspended) {
+        this.suspended = suspended;
+    }
+
+    public StackTraceElement[] getStackTrace() {
+        return stackTrace;
+    }
+
+    public void setStackTrace(StackTraceElement[] stackTrace) {
+        this.stackTrace = stackTrace;
+    }
+
+    public MonitorInfo[] getLockedMonitors() {
+        return lockedMonitors;
+    }
+
+    public void setLockedMonitors(MonitorInfo[] lockedMonitors) {
+        this.lockedMonitors = lockedMonitors;
+    }
+
+    public LockInfo[] getLockedSynchronizers() {
+        return lockedSynchronizers;
+    }
+
+    public void setLockedSynchronizers(LockInfo[] lockedSynchronizers) {
+        this.lockedSynchronizers = lockedSynchronizers;
+    }
+}

core/src/main/java/com/taobao/arthas/core/command/model/CatModel.java

+package com.taobao.arthas.core.command.model;
+
+/**
+ * Result model for CatCommand
+ * @author gongdewei 2020/5/11
+ */
+public class CatModel extends ResultModel implements Countable {
+
+    private String file;
+    private String content;
+
+    public CatModel() {
+    }
+
+    public CatModel(String file, String content) {
+        this.file = file;
+        this.content = content;
+    }
+
+    @Override
+    public String getType() {
+        return "cat";
+    }
+
+    public String getFile() {
+        return file;
+    }
+
+    public void setFile(String file) {
+        this.file = file;
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
+
+    @Override
+    public int size() {
+        if (content != null) {
+            //粗略计算行数作为item size
+            return content.length()/100 + 1;
+        }
+        return 0;
+    }
+}

core/src/main/java/com/taobao/arthas/core/command/model/ChangeResultVO.java

+package com.taobao.arthas.core.command.model;
+
+/**
+ * @author gongdewei 2020/4/16
+ */
+public class ChangeResultVO {
+    private String name;
+    private Object beforeValue;
+    private Object afterValue;
+
+    public ChangeResultVO() {
+    }
+
+    public ChangeResultVO(String name, Object beforeValue, Object afterValue) {
+        this.name = name;
+        this.beforeValue = beforeValue;
+        this.afterValue = afterValue;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Object getBeforeValue() {
+        return beforeValue;
+    }
+
+    public void setBeforeValue(Object beforeValue) {
+        this.beforeValue = beforeValue;
+    }
+
+    public Object getAfterValue() {
+        return afterValue;
+    }
+
+    public void setAfterValue(Object afterValue) {
+        this.afterValue = afterValue;
+    }
+}
+