watch等命令 retransformClasses 执行失败 java.lang.InternalError #730

hengyunabc · 2019-06-05T11:59:36Z

执行：

$ watch watch org.apache.logging.log4j.core.filter.AbstractFilterable isFiltered "{params,returnObj}"
Error during processing the command: null

查看~/logs/arthas/arthas.log:

java.lang.InternalError: null
        at sun.instrument.InstrumentationImpl.retransformClasses0(Native Method) ~[na:1.8.0_102]
        at sun.instrument.InstrumentationImpl.retransformClasses(InstrumentationImpl.java:144) ~[na:1.8.0_102]
        at com.taobao.arthas.core.advisor.Enhancer.enhance(Enhancer.java:304) ~[arthas-core.jar:3.1.1]
        at com.taobao.arthas.core.command.monitor200.EnhancerCommand.enhance(EnhancerCommand.java:111) ~[arthas-core.jar:3.1.1]
        at com.taobao.arthas.core.command.monitor200.EnhancerCommand.process(EnhancerCommand.java:66) ~[arthas-core.jar:3.1.1]
        at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.process(AnnotatedCommandImpl.java:82) ~[arthas-core.jar:3.1.1]
        at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.access$100(AnnotatedCommandImpl.java:18) ~[arthas-core.jar:3.1.1]
        at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:111) ~[arthas-core.jar:3.1.1]
        at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:108) ~[arthas-core.jar:3.1.1]
        at com.taobao.arthas.core.shell.system.impl.ProcessImpl$CommandProcessTask.run(ProcessImpl.java:370) ~[arthas-core.jar:3.1.1]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_102]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_102]
        at java.lang.Thread.run(Thread.java:766) [na:1.8.0_102]

用sc命令来查找这个类，发现有非常多的实现类：

$ sc watch org.apache.logging.log4j.core.filter.AbstractFilterable
watch org.apache.logging.log4j.core.appender.AbstractAppender   
watch org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender
watch org.apache.logging.log4j.core.appender.AbstractWriterAppender
watch org.apache.logging.log4j.core.appender.AsyncAppender
watch org.apache.logging.log4j.core.appender.ConsoleAppender
watch org.apache.logging.log4j.core.appender.CountingNoOpAppender
watch org.apache.logging.log4j.core.appender.FailoverAppender
watch org.apache.logging.log4j.core.appender.FileAppender
watch org.apache.logging.log4j.core.appender.MemoryMappedFileAppender
watch org.apache.logging.log4j.core.appender.NullAppender
watch org.apache.logging.log4j.core.appender.OutputStreamAppender
watch org.apache.logging.log4j.core.appender.RandomAccessFileAppender
watch org.apache.logging.log4j.core.appender.RollingFileAppender
watch org.apache.logging.log4j.core.appender.RollingRandomAccessFileAppender
watch org.apache.logging.log4j.core.appender.ScriptAppenderSelector
watch org.apache.logging.log4j.core.appender.SmtpAppender
watch org.apache.logging.log4j.core.appender.SocketAppender
watch org.apache.logging.log4j.core.appender.SyslogAppender
watch org.apache.logging.log4j.core.appender.WriterAppender
watch org.apache.logging.log4j.core.appender.db.AbstractDatabaseAppender
watch org.apache.logging.log4j.core.appender.db.jdbc.JdbcAppender
watch org.apache.logging.log4j.core.appender.db.jpa.JpaAppender
watch org.apache.logging.log4j.core.appender.mom.JmsAppender
watch org.apache.logging.log4j.core.appender.mom.jeromq.JeroMqAppender
watch org.apache.logging.log4j.core.appender.mom.kafka.KafkaAppender
watch org.apache.logging.log4j.core.appender.rewrite.RewriteAppender
watch org.apache.logging.log4j.core.appender.routing.RoutingAppender
watch org.apache.logging.log4j.core.async.AsyncLoggerConfig
watch org.apache.logging.log4j.core.async.AsyncLoggerConfig$RootLogger
watch org.apache.logging.log4j.core.config.AbstractConfiguration
watch org.apache.logging.log4j.core.config.AppenderControl
watch org.apache.logging.log4j.core.config.DefaultConfiguration
watch org.apache.logging.log4j.core.config.LoggerConfig
watch org.apache.logging.log4j.core.config.LoggerConfig$RootLogger
watch org.apache.logging.log4j.core.config.NullConfiguration
watch org.apache.logging.log4j.core.config.xml.XmlConfiguration
watch org.apache.logging.log4j.core.filter.AbstractFilterable

查看代码，发现执行的是批量增强：

//com.taobao.arthas.core.advisor.Enhancer
        // 构建增强器
        final Enhancer enhancer = new Enhancer(adviceId, isTracing, skipJDKTrace, enhanceClassSet, methodNameMatcher, affect);
        try {
            inst.addTransformer(enhancer, true);

            // 批量增强
            if (GlobalOptions.isBatchReTransform) {
                final int size = enhanceClassSet.size();
                final Class<?>[] classArray = new Class<?>[size];
                arraycopy(enhanceClassSet.toArray(), 0, classArray, 0, size);
                if (classArray.length > 0) {
                    inst.retransformClasses(classArray);
                    logger.info("Success to batch transform classes: " + Arrays.toString(classArray));
                }
            } else {
                // for each 增强
                for (Class<?> clazz : enhanceClassSet) {
                    try {
                        inst.retransformClasses(clazz);
                        logger.info("Success to transform class: " + clazz);
                    } catch (Throwable t) {
                        logger.warn("retransform {} failed.", clazz, t);
                        if (t instanceof UnmodifiableClassException) {
                            throw (UnmodifiableClassException) t;
                        } else if (t instanceof RuntimeException) {
                            throw (RuntimeException) t;
                        } else {
                            throw new RuntimeException(t);
                        }
                    }
                }
            }
        } finally {
            inst.removeTransformer(enhancer);
        }

试下把批量增强关掉：

$ options batch-re-transform false

再来执行：

$ watch org.apache.logging.log4j.core.filter.AbstractFilterable isFiltered "{params,returnObj}"
Error during processing the command: java.lang.InternalError

再查看日志，打印出了具体的类org.apache.logging.log4j.core.appender.mom.JmsAppender ：

01 2019-06-05 19:48:51.500 WARN [as-command-execute-daemon:arthas] [] [] [] retransform class org.apache.logging.log4j.core.appender.mom.JmsAppender failed.
java.lang.InternalError: null
        at sun.instrument.InstrumentationImpl.retransformClasses0(Native Method) ~[na:1.8.0_102]
        at sun.instrument.InstrumentationImpl.retransformClasses(InstrumentationImpl.java:144) ~[na:1.8.0_102]
        at com.taobao.arthas.core.advisor.Enhancer.enhance(Enhancer.java:311) ~[arthas-core.jar:3.1.1]
        at com.taobao.arthas.core.command.monitor200.EnhancerCommand.enhance(EnhancerCommand.java:111) [arthas-core.jar:3.1.1]

再用jad来查看下源代码：

$ jad org.apache.logging.log4j.core.appender.mom.JmsAppender

ClassLoader:
+-org.springframework.boot.loader.LaunchedURLClassLoader@16267862
  +-sun.misc.Launcher$AppClassLoader@18b4aac2
    +-sun.misc.Launcher$ExtClassLoader@3ecd23d9

Location:
file:/home/admin/xxx/target/exploded/BOOT-INF/lib/log4j-core-2.8.2.jar!/

/*
 * Decompiled with CFR 0_132.
 *
 * Could not load the following classes:
 *  javax.jms.JMSException
 *  javax.jms.Message
 *  javax.jms.MessageProducer
 *  org.apache.logging.log4j.Logger
 *  org.apache.logging.log4j.core.Filter
 *  org.apache.logging.log4j.core.Layout
 *  org.apache.logging.log4j.core.LogEvent
 *  org.apache.logging.log4j.core.appender.AbstractAppender
 *  org.apache.logging.log4j.core.appender.AppenderLoggingException
 *  org.apache.logging.log4j.core.appender.mom.JmsAppender$1
 *  org.apache.logging.log4j.core.appender.mom.JmsAppender$Builder
 *  org.apache.logging.log4j.core.appender.mom.JmsManager
 *  org.apache.logging.log4j.core.config.plugins.Plugin
 *  org.apache.logging.log4j.core.config.plugins.PluginAliases
 *  org.apache.logging.log4j.core.config.plugins.PluginBuilderFactory
 */
package org.apache.logging.log4j.core.appender.mom;

import java.io.Serializable;
import java.util.concurrent.TimeUnit;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageProducer;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.Filter;
import org.apache.logging.log4j.core.Layout;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.appender.AbstractAppender;
import org.apache.logging.log4j.core.appender.AppenderLoggingException;
import org.apache.logging.log4j.core.appender.mom.JmsAppender;
import org.apache.logging.log4j.core.appender.mom.JmsManager;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.config.plugins.PluginAliases;
import org.apache.logging.log4j.core.config.plugins.PluginBuilderFactory;

@Plugin(name="JMS", category="Core", elementType="appender", printObject=true)
@PluginAliases(value={"JMSQueue", "JMSTopic"})
public class JmsAppender
extends AbstractAppender {
    private final JmsManager manager;
    private final MessageProducer producer;
    private static transient /* synthetic */ boolean[] $jacocoData;

    protected JmsAppender(String string, Filter filter, Layout<? extends Serializable> layout, boolean bl, JmsManager jmsManager) throws JMSException {
        void layout2;
        void filter2;
        void ignoreExceptions;
        void name;
        void manager;
        boolean[] arrbl = JmsAppender.$jacocoInit();
        super((String)name, (Filter)filter2, (Layout)layout2, (boolean)ignoreExceptions);
        this.manager = manager;
        arrbl[0] = true;
        this.producer = this.manager.createMessageProducer();
        arrbl[1] = true;
    }

    public void append(LogEvent logEvent) {
        boolean[] arrbl = JmsAppender.$jacocoInit();
        try {
            void event;
            void message;
            Message message2 = this.manager.createMessage(this.getLayout().toSerializable((LogEvent)event));
            arrbl[2] = true;
            message.setJMSTimestamp(event.getTimeMillis());
            arrbl[3] = true;
            this.producer.send((Message)message);
        }
        catch (JMSException message) {
            void e;
            arrbl[4] = true;
            arrbl[5] = true;
            throw new AppenderLoggingException((Throwable)e);
        }
        arrbl[6] = true;
    }

    public boolean stop(long l, TimeUnit timeUnit) {
        void timeout;
        void timeUnit2;
        boolean[] arrbl = JmsAppender.$jacocoInit();
        this.setStopping();
        arrbl[7] = true;
        boolean bl = super.stop((long)timeout, (TimeUnit)timeUnit2, false);
        arrbl[8] = true;
        arrbl[9] = true;
        this.setStopped();
        arrbl[10] = true;
        return stopped &= this.manager.stop((long)timeout, (TimeUnit)timeUnit2);
    }

    @PluginBuilderFactory
    public static Builder newBuilder() {
        boolean[] arrbl = JmsAppender.$jacocoInit();
        arrbl[11] = true;
        return new Builder(null);
    }

    static /* synthetic */ Logger access$100() {
        boolean[] arrbl = JmsAppender.$jacocoInit();
        arrbl[12] = true;
        return LOGGER;
    }

    private static /* synthetic */ boolean[] $jacocoInit() {
        boolean[] arrbl = $jacocoData;
        if (arrbl == null) {
            Object[] arrobject = new Object[]{-6190699681961106805L, "org/apache/logging/log4j/core/appender/mom/JmsAppender", 13};
            UnknownError.$jacocoAccess.equals(arrobject);
            arrbl = $jacocoData = (boolean[])arrobject[0];
        }
        return arrbl;
    }
}

发现是被jacoco处理过的

The text was updated successfully, but these errors were encountered:

hengyunabc · 2019-06-06T08:52:45Z

重新测试了下，发现不是jacoco引起的：

import java.io.IOException;

public class TestJmsAppender {
	public static void main(String[] args) throws IOException {
		System.out.println(org.apache.logging.log4j.core.appender.mom.JmsAppender.class);
		System.in.read();
	}
}

启动：

java -cp /Users/hengyunabc/.m2/repository/org/apache/logging/log4j/log4j-core/2.11.2/log4j-core-2.11.2.jar:. TestJmsAppender

用arthas执行：

watch org.apache.logging.log4j.core.appender.mom.JmsAppender stop target

错误是：

java.lang.InternalError: null
        at sun.instrument.InstrumentationImpl.retransformClasses0(Native Method) ~[na:1.8.0_112]
        at sun.instrument.InstrumentationImpl.retransformClasses(InstrumentationImpl.java:144) ~[na:1.8.0_112]
        at com.taobao.arthas.core.advisor.Enhancer.enhance(Enhancer.java:304) ~[arthas-core.jar:3.1.1]
        at com.taobao.arthas.core.command.monitor200.EnhancerCommand.enhance(EnhancerCommand.java:111) ~[arthas-core.jar:3.1.1]
        at com.taobao.arthas.core.command.monitor200.EnhancerCommand.process(EnhancerCommand.java:66) ~[arthas-core.jar:3.1.1]
        at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.process(AnnotatedCommandImpl.java:82) ~[arthas-core.jar:3.1.1]
        at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.access$100(AnnotatedCommandImpl.java:18) ~[arthas-core.jar:3.1.1]
        at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:111) ~[arthas-core.jar:3.1.1]
        at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:108) ~[arthas-core.jar:3.1.1]
        at com.taobao.arthas.core.shell.system.impl.ProcessImpl$CommandProcessTask.run(ProcessImpl.java:370) ~[arthas-core.jar:3.1.1]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_112]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_112]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_112]

可能是JVM本身的bug，找到两个相关的issue：

hengyunabc · 2019-06-06T09:41:05Z

2.8.2版本

出错：

/Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk/Contents/Home/bin/java -cp /Users/hengyunabc/.m2/repository/org/apache/logging/log4j/log4j-core/2.8.2/log4j-core-2.8.2.jar:. TestJmsAppender

出错：

/Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk/Contents/Home/bin/java -cp /Users/hengyunabc/.m2/repository/org/apache/logging/log4j/log4j-core/2.8.2/log4j-core-2.8.2.jar:/Users/hengyunabc/.m2/repository/org/apache/logging/log4j/log4j-api/2.8.2/log4j-api-2.8.2.jar:. TestJmsAppender

2.11.2版本

出错：

/Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk/Contents/Home/bin/java -cp /Users/hengyunabc/.m2/repository/org/apache/logging/log4j/log4j-core/2.11.2/log4j-core-2.11.2.jar:. TestJmsAppender

正常：

/Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk/Contents/Home/bin/java -cp /Users/hengyunabc/.m2/repository/org/apache/logging/log4j/log4j-core/2.11.2/log4j-core-2.11.2.jar:/Users/hengyunabc/.m2/repository/org/apache/logging/log4j/log4j-api/2.11.2/log4j-api-2.11.2.jar:. TestJmsAppender

在执行watch之前，classloader加载到的类是：

$ classloader -c 4e25154f -a
 hash:1311053135, sun.misc.Launcher$AppClassLoader@4e25154f
 TestJmsAppender
 com.taobao.arthas.agent.AgentBootstrap
 com.taobao.arthas.agent.AgentBootstrap$1
 com.taobao.arthas.agent.ArthasClassloader
 org.apache.logging.log4j.core.AbstractLifeCycle
 org.apache.logging.log4j.core.Appender
 org.apache.logging.log4j.core.LifeCycle
 org.apache.logging.log4j.core.LifeCycle2
 org.apache.logging.log4j.core.appender.AbstractAppender
 org.apache.logging.log4j.core.appender.mom.JmsAppender
 org.apache.logging.log4j.core.filter.AbstractFilterable
 org.apache.logging.log4j.core.filter.Filterable

在watch之后，加载到的类是：

 $ classloader -c 4e25154f -a
 hash:1311053135, sun.misc.Launcher$AppClassLoader@4e25154f
 TestJmsAppender
 com.taobao.arthas.agent.AgentBootstrap
 com.taobao.arthas.agent.AgentBootstrap$1
 com.taobao.arthas.agent.ArthasClassloader
 org.apache.logging.log4j.Logger
 org.apache.logging.log4j.core.AbstractLifeCycle
 org.apache.logging.log4j.core.Appender
 org.apache.logging.log4j.core.ErrorHandler
 org.apache.logging.log4j.core.Filter
 org.apache.logging.log4j.core.LifeCycle
 org.apache.logging.log4j.core.LifeCycle2
 org.apache.logging.log4j.core.appender.AbstractAppender
 org.apache.logging.log4j.core.appender.mom.JmsAppender
 org.apache.logging.log4j.core.filter.AbstractFilterable
 org.apache.logging.log4j.core.filter.Filterable

发现watch前后，多加载了三个类 org.apache.logging.log4j.Logger ， org.apache.logging.log4j.core.ErrorHandler ， org.apache.logging.log4j.core.Filter 。

其中 org.apache.logging.log4j.Logger 是在 log4j-api 里的。

hengyunabc · 2019-06-06T11:22:51Z

org.apache.logging.log4j.core.appender.mom.JmsAppender 本身依赖一些JMS的类，在应用的classpath里是没有的。

疑问是：

jdk在retransformClasses 时，会触发其它类的加载不？是否加载类失败的异常被吃掉了
具体什么原因导致 2.8.2版本失败，2.11.2版本可以执行？

kylixs · 2020-05-09T03:22:52Z

在arthas-mybatis-demo中遇到这个问题，可能是依赖的class not found导致的。
1） trace org.apache.ibatis.logging.Log *

[arthas@35581]$ trace org.apache.ibatis.logging.Log *
Error during processing the command: null

2020-05-09 11:14:53 [as-command-execute-daemon] ERROR c.t.a.c.s.system.impl.ProcessImpl -Error during processing the command:
java.lang.InternalError: null
        at sun.instrument.InstrumentationImpl.retransformClasses0(Native Method)
        at sun.instrument.InstrumentationImpl.retransformClasses(InstrumentationImpl.java:144)
        at com.taobao.arthas.core.advisor.Enhancer.enhance(Enhancer.java:303)
        at com.taobao.arthas.core.command.monitor200.EnhancerCommand.enhance(EnhancerCommand.java:113)
        at com.taobao.arthas.core.command.monitor200.EnhancerCommand.process(EnhancerCommand.java:68)
        at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.process(AnnotatedCommandImpl.java:82)
        at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.access$100(AnnotatedCommandImpl.java:18)
        at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:111)
        at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:108)
        at com.taobao.arthas.core.shell.system.impl.ProcessImpl$CommandProcessTask.run(ProcessImpl.java:383)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)

sm org.apache.ibatis.logging.Log *

[arthas@35581]$ sm org.apache.ibatis.logging.Log *
Error during processing the command: org/apache/log4j/Priority

调试发现处理 org.apache.ibatis.logging.log4j.Log4jImpl 这类就会失败抛出异常：

2020-05-09 11:14:43 [as-command-execute-daemon] ERROR c.t.a.c.s.system.impl.ProcessImpl -Error during processing the command:
java.lang.NoClassDefFoundError: org/apache/log4j/Priority
        at java.lang.Class.getDeclaredConstructors0(Native Method)
        at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
        at java.lang.Class.getDeclaredConstructors(Class.java:2020)
        at com.taobao.arthas.core.command.klass100.SearchMethodCommand.process(SearchMethodCommand.java:92)
        at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.process(AnnotatedCommandImpl.java:82)
        at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.access$100(AnnotatedCommandImpl.java:18)
        at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:111)
        at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:108)
        at com.taobao.arthas.core.shell.system.impl.ProcessImpl$CommandProcessTask.run(ProcessImpl.java:383)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Priority
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:92)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 12 common frames omitted

jad org.apache.ibatis.logging.log4j.Log4jImpl
提示加载org.apache.log4j的一些类失败

/*
 * Decompiled with CFR.
 * 
 * Could not load the following classes:
 *  org.apache.ibatis.logging.Log
 *  org.apache.log4j.Level
 *  org.apache.log4j.Logger
 *  org.apache.log4j.Priority
 */
package org.apache.ibatis.logging.log4j;

import org.apache.ibatis.logging.Log;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.Priority;

public class Log4jImpl
implements Log {
    private static final String FQCN = Log4jImpl.class.getName();
    private final Logger log;

4）查看org.apache.log4j.Priority

[arthas@35581]$ sc org.apache.log4j.Priority
Affect(row-cnt:0) cost in 5 ms.
[arthas@35581]$ sm org.apache.log4j.Priority *
Affect(row-cnt:0) cost in 3 ms.

trace org.apache.ibatis.logging.log4j.Log4jImpl *

[arthas@35581]$ trace org.apache.ibatis.logging.log4j.Log4jImpl *
Error during processing the command: null

trace 这个Log4jImpl，日志错误和上面trace 接口的一样: java.lang.InternalError: null。
到这里可以得出结论，如果某个类所依赖的其它类加载失败，会导致增强失败，抛出异常： java.lang.InternalError: null

kylixs · 2020-05-09T03:46:52Z

org.apache.logging.log4j.core.appender.mom.JmsAppender 本身依赖一些JMS的类，在应用的classpath里是没有的。

疑问是：

jdk在retransformClasses 时，会触发其它类的加载不？是否加载类失败的异常被吃掉了

具体什么原因导致 2.8.2版本失败，2.11.2版本可以执行？

retransformClasses 会触发加载类，但不会抛出ClassNotFound错误，可能初始化方式不同。如果使用sm xxx ，则会提示ClassNotFound错误。
AbstractFilterable是一个抽象类
public abstract class AbstractFilterable extends AbstractLifeCycle implements Filterable {
推测 2.8.2 和 2.11.2的依赖项有所不同，其中某个子类缺少依赖，导致处理这个子类时失败。

hengyunabc added the question-answered label Jun 5, 2019

hengyunabc changed the title ~~jacoco agent导致的 watch等命令执行失败 java.lang.InternalError~~ watch等命令 retransformClasses 执行失败 java.lang.InternalError Jun 6, 2019

kylixs added a commit to kylixs/arthas that referenced this issue May 9, 2020

alibaba#730 print sm process failed class name

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kylixs mentioned this issue May 9, 2020

#730 print sm process failed class name #1160

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kylixs added a commit that referenced this issue May 21, 2020

#730 print sm process failed class name (#1160)

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lzc-alioo pushed a commit to lzc-alioo/arthas that referenced this issue May 22, 2020

alibaba#730 print sm process failed class name (alibaba#1160)

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watch等命令 retransformClasses 执行失败 java.lang.InternalError #730

watch等命令 retransformClasses 执行失败 java.lang.InternalError #730

hengyunabc commented Jun 5, 2019

hengyunabc commented Jun 6, 2019

hengyunabc commented Jun 6, 2019 •

edited

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hengyunabc commented Jun 6, 2019

kylixs commented May 9, 2020 •

edited

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kylixs commented May 9, 2020

watch等命令 retransformClasses 执行失败 java.lang.InternalError #730

watch等命令 retransformClasses 执行失败 java.lang.InternalError #730

Comments

hengyunabc commented Jun 5, 2019

hengyunabc commented Jun 6, 2019

hengyunabc commented Jun 6, 2019 • edited Loading

2.8.2版本

2.11.2版本

hengyunabc commented Jun 6, 2019

kylixs commented May 9, 2020 • edited Loading

kylixs commented May 9, 2020

hengyunabc commented Jun 6, 2019 •

edited

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kylixs commented May 9, 2020 •

edited

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