[alibaba/arthas]watch命令报错class redefinition failed: attempted to change the schema (add/remove fields)

2024-04-24 518 views
6
环境信息
  • arthas-boot.jar 或者 as.sh 的版本: xxx

  • Arthas 版本: 3.5.2

  • 操作系统版本: Linux version 3.10.0-1127.13.1.el7.x86_64 (mockbuild@kbuilder.bsys.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-39) (GCC) ) #1 SMP Tue Jun 23 15:46:38 UTC 2020

  • 目标进程的JVM版本: java version "1.8.0_251" Java(TM) SE Runtime Environment (build 1.8.0_251-b08) Java HotSpot(TM) 64-Bit Server VM (build 25.251-b08, mixed mode)

  • 执行arthas-boot的版本: xxx

重现问题的步骤

watch查看方法的返回参数,报错 [arthas@16943]$ watch Controller receive '{params,returnObj,throwExp}' -v -n 5 -x 2 Affect(class count: 1 , method count: 1) cost in 47 ms, listenerId: 3 Enhance error! exception: java.lang.UnsupportedOperationException: class redefinition failed: attempted to change the schema (add/remove fields) error happens when enhancing class: class redefinition failed: attempted to change the schema (add/remove fields), check arthas log: /home/apprun/logs/arthas/arthas.log

arthas日志显示 [arthas-command-execute] ERROR c.t.arthas.core.advisor.Enhancer -Enhancer error, matchingClasses: [class xx.xx.controller] java.lang.UnsupportedOperationException: class redefinition failed: attempted to change the schema (add/remove fields) 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:396) at com.taobao.arthas.core.command.monitor200.EnhancerCommand.enhance(EnhancerCommand.java:168) at com.taobao.arthas.core.command.monitor200.EnhancerCommand.process(EnhancerCommand.java:115) 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:385) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) 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)

期望的结果

watch命令能正常执行

实际运行的结果

如上arthas日志和watch执行命令的报错


把异常信息贴到这里
[arthas-command-execute] ERROR c.t.arthas.core.advisor.Enhancer -Enhancer error, matchingClasses: [class xx.xx.controller]
java.lang.UnsupportedOperationException: class redefinition failed: attempted to change the schema (add/remove fields)
 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:396)
 at com.taobao.arthas.core.command.monitor200.EnhancerCommand.enhance(EnhancerCommand.java:168)
 at com.taobao.arthas.core.command.monitor200.EnhancerCommand.process(EnhancerCommand.java:115)
 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:385)
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
 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)

回答

6

执行watch命令为:watch xx.xx.controller receive '{params,returnObj,throwExp}' -v -n 5 -x 2 linux系统为:Red Hat 4.8.5-39

0

你好,我不太明白,是需要在复制一份java文件,然后用retransform重新加载吗

9

参考这个: #969 ,也可能有其它的agent,比如统计代码覆盖率的,修改了.class,增加了一些field。

你好,我不太明白,是需要在复制一份java文件,然后用retransform重新加载吗

7

参考这个: #969 ,也可能有其它的agent,比如统计代码覆盖率的,修改了.class,增加了一些field。

你好,我不太明白,是需要在复制一份java文件,然后用retransform重新加载吗

可以用 dump 命令把 .class dump下来,然后本地再用其它的反编译软件查看是不是多了其它的 field。

如果 dump 命令执行失败,则可以试下用 https://github.com/hengyunabc/dumpclass 这个工具来 dump class,再做对比。


错误提示的原因是很明确的,就是字节码里 多了/删了 field 。所以要找到具体的字节码来查看原因。


另外,在arthas里执行options dump true ,再执行 watch,在日志里可以看到会把 watch命令处理过的.class保存到本地。也可以再拿出来对比。

3

你好,我用options dump true,再执行 watch,下载下来.class文件,查看了下,类实现了EnhancedInstance接口,并且 方法中有SpyAPI.atEnter,SpyAPI.atExit,SpyAPI.atExceptionExit,现在需要怎么处理才能执行watch不报错,能够查看方法的返回参数

6

EnhancedInstance接口

这个不是arthas实现的,如果不是应用代码自己带的,就是有其它的类增强软件生成的。检查对比,有没有新增了field,有没有 lambda的新类名不一致等。

4

你好,我们项目中有依赖skywalking,但是我不确定是不是因为skywalking的原因,因为有两套环境都依赖了skywalking,只有其中一个环境的watch命令不行

org.apache.skywalking apm-toolkit-logback-1.x 8.4.0
3

那个EnhancedInstance接口是来着skywalking的引用