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Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas
https://arthas.aliyun.com/
Apache License 2.0
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No class or method is affected/Trace, watch等命令无法找到对应的类和方法 #47

Closed ralf0131 closed 5 years ago

ralf0131 commented 6 years ago

分为两种情况：

一、 先用sc或者sm搜索对应的类和方法，确认有结果，确认已经被JVM加载的

  1. 系统级别的类（即java.*)默认不能进行增强，需要增强是请参考这里的unsafe开关，增强系统类时请谨慎操作

    options unsafe true

  2. 检查下 $HOME/logs/arthas/arthas.log，有没有 ERROR c.t.arthas.core.advisor.Enhancer -the classloader can not load SpyAPI, ignore it. 的日志。如果有，则加载目标类的ClassLoader实现代码有问题，没能正确加载java.* package下面的类。可以尝试开启arthas.enhanceLoaders=java.lang.ClassLoader配置项 ，参考： https://github.com/alibaba/arthas/issues/1596

  3. 构造函数是<init>，例如：watch demo.MathGame <init> '{params,returnObj,throwExp}' -v

  4. 默认情况下，enum类会被过滤掉，参考： https://github.com/alibaba/arthas/issues/1677

  5. 不支持对 lambda 生成的动态类做增强，JVM自身限制

  6. 数组类、接口类、枚举类以及java.lang.Class/java.lang.Integer/java.lang.reflect.Method等类都是不能进行增强的

  7. 由Arthas自身的ClassLoader加载的类不能被增强

  8. 在$HOME/logs/arthas/arthas.log中查找有没有Method code too large的异常

  9. 存在该异常时，尝试用reset class_name命令对类进行恢复，再进行trace，watch等操作

二、用sc或者sm搜索对应的类和方法，结果是0时

  1. 查找内部类要用 $ 符号拼出正确的类名，比如sc outer-class$inner-class
  2. 连错了进程，如果之前连过别的进程，且没有shutdown退出，则下次连别的进程时，默认还会连到之前连的进程上。
ralf0131 commented 6 years ago

另外，数组类、接口类、枚举类以及java.lang.Class/java.lang.Integer/java.lang.reflect.Method等类都是不能进行增强的

wh654759860 commented 6 years ago

找类需要加包名，如：com.xxx.xxx.xxxController

ralf0131 commented 6 years ago

If you would like to search for an inner class, you have to use sc outer-class$inner-class. 查找内部类，需要按照如下格式进行 sc outer-class$inner-class

Crossoverrr commented 6 years ago

直接 sc *Controller* 就行

ralf0131 commented 5 years ago

Need to add English translation.

ougyou commented 5 years ago

image image

reset后又trace还是提示相同的错误，日志还是提示该类还是无法增强，

PS：该类有13k行左右。

hengyunabc commented 5 years ago

PS：该类有13k行左右。

这个没有办法。JVM本身有限制。

ougyou commented 5 years ago

PS：该类有13k行左右。

这个没有办法。JVM本身有限制。

这个场景描述的真好，难道jvm在针对我？ 这个场景和我的问题的区别在哪？
image

xiqicode commented 5 years ago

jad: fail to decompile class，caused by java.lang.VerifyError image

hengyunabc commented 5 years ago

jad: fail to decompile class，caused by java.lang.VerifyError

有没有可以重现的Demo

xiqicode commented 5 years ago

jad: fail to decompile class，caused by java.lang.VerifyError

有没有可以重现的Demo

我试试能不能把这个类分离出来

hengyunabc commented 5 years ago

@xiqicode 参考这个： https://github.com/alibaba/arthas/issues/675#issuecomment-487856710

gong1989313 commented 5 years ago

我的类明明有的，为什么用arthas找到类。 No class or method is affected, try:

  1. sm CLASS_NAME METHOD_NAME to make sure the method you are tracing actually exists (it might be in your parent class).
  2. reset CLASS_NAME and try again, your method body might be too large.
  3. check arthas log: /home/tomcat/logs/arthas/arthas.log
  4. visit https://github.com/alibaba/arthas/issues/47 for more details.
orclight commented 5 years ago

问题：问啥会链接另外一个进程？pid 确认没有问题

背景：在这台机器上部署了多个程序。

开始能找到，后边过一段时间后找不到了。最后发现连接到了另外一个进程 使用sc controller 发现了另外一个进程的类

hengyunabc commented 5 years ago

问题：问啥会链接另外一个进程？pid 确认没有问题

背景：在这台机器上部署了多个程序。

开始能找到，后边过一段时间后找不到了。最后发现连接到了另外一个进程 使用sc controller 发现了另外一个进程的类

先 shutdown ，或者指定另外的端口。不然会直接连接到之前进程 listen的端口。

orclight commented 5 years ago

我把2个进程都重启，解决了

orclight commented 5 years ago

问题：问啥会链接另外一个进程？pid 确认没有问题 背景：在这台机器上部署了多个程序。 开始能找到，后边过一段时间后找不到了。最后发现连接到了另外一个进程 使用sc controller 发现了另外一个进程的类

先 shutdown ，或者指定另外的端口。不然会直接连接到之前进程 listen的端口。

多谢

18251850675 commented 5 years ago

使用watch命令时，怎么区分同一个类中的同名方法呢？ 比如demoMethod(String)和demoMethod(String,String)

hengyunabc commented 5 years ago

使用watch命令时，怎么区分同一个类中的同名方法呢？ 比如demoMethod(String)和demoMethod(String,String)

参考： https://github.com/alibaba/arthas/issues/434

supAllen commented 5 years ago

请问长度限制是多少？我两个controller加起来不到200行。。。

No class or method is affected, try:

  1. sm CLASS_NAME METHOD_NAME to make sure the method you are tracing actually exists (it might be in your parent class).
  2. reset CLASS_NAME and try again, your method body might be too large.
  3. check arthas log: /home/momobot/logs/arthas/arthas.log
  4. visit https://github.com/alibaba/arthas/issues/47 for more details.
HelloJRay commented 5 years ago

想要使用watch命令监控第三方包内的方法，但是一直找不到该类。请问这种情况是什么问题导致的，可以怎么解决？

具体执行命令详情如下： $ sm InfluxDB org.influxdb.InfluxDB$LogLevel (Ljava/lang/String;I)V org.influxdb.InfluxDB$LogLevel values()[Lorg/influxdb/InfluxDB$LogLevel; org.influxdb.InfluxDB$LogLevel valueOf(Ljava/lang/String;)Lorg/influxdb/InfluxDB$LogLevel; org.influxdb.InfluxDB setConnectTimeout(JLjava/util/concurrent/TimeUnit;)V org.influxdb.InfluxDB setReadTimeout(JLjava/util/concurrent/TimeUnit;)V org.influxdb.InfluxDB setWriteTimeout(JLjava/util/concurrent/TimeUnit;)V org.influxdb.InfluxDB enableBatch(IILjava/util/concurrent/TimeUnit;)Lorg/influxdb/InfluxDB; org.influxdb.InfluxDB disableBatch()V org.influxdb.InfluxDB setLogLevel(Lorg/influxdb/InfluxDB$LogLevel;)Lorg/influxdb/InfluxDB; org.influxdb.InfluxDB ping()Lorg/influxdb/dto/Pong; org.influxdb.InfluxDB createDatabase(Ljava/lang/String;)V org.influxdb.InfluxDB deleteDatabase(Ljava/lang/String;)V org.influxdb.InfluxDB describeDatabases()Ljava/util/List; org.influxdb.InfluxDB write(Lorg/influxdb/dto/BatchPoints;)V org.influxdb.InfluxDB write(Ljava/lang/String;Ljava/lang/String;Lorg/influxdb/dto/Point;)V org.influxdb.InfluxDB query(Lorg/influxdb/dto/Query;)Lorg/influxdb/dto/QueryResult; org.influxdb.InfluxDB query(Lorg/influxdb/dto/Query;Ljava/util/concurrent/TimeUnit;)Lorg/influxdb/dto/QueryResult; org.influxdb.InfluxDB version()Ljava/lang/String; org.influxdb.InfluxDBFactory (Ljava/lang/String;I)V org.influxdb.InfluxDBFactory values()[Lorg/influxdb/InfluxDBFactory; org.influxdb.InfluxDBFactory valueOf(Ljava/lang/String;)Lorg/influxdb/InfluxDBFactory; org.influxdb.InfluxDBFactory connect(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Lorg/influxdb/InfluxDB; Affect(row-cnt:22) cost in 74 ms. $ watch org.influxdb.InfluxDB query "{returnObj}" -x 2 No class or method is affected, try:

  1. sm CLASS_NAME METHOD_NAME to make sure the method you are tracing actually exists (it might be in your parent class).
  2. reset CLASS_NAME and try again, your method body might be too large.
  3. check arthas log: /root/logs/arthas/arthas.log
  4. visit https://github.com/alibaba/arthas/issues/47 for more details.
gitzhoujw commented 4 years ago

5000多行的类，还有子类，报too large了

hengyunabc commented 4 years ago

jdk8后的default 函数参考： https://github.com/alibaba/arthas/issues/1105

wangliguang517 commented 4 years ago

[arthas@25752]$ watch java.util.concurrent.ThreadPoolExecutor isTerminated "{params,returnObj}" -x 2 No class or method is affected, try:

  1. sm CLASS_NAME METHOD_NAME to make sure the method you are tracing actually exists (it might be in your parent class).
  2. reset CLASS_NAME and try again, your method body might be too large.
  3. check arthas log: /home/jboss/logs/arthas/arthas.log
  4. visit https://github.com/alibaba/arthas/issues/47 for more details. [arthas@25752]$ sm java.util.concurrent.ThreadPoolExecutor isTerminated java.util.concurrent.ThreadPoolExecutor isTerminated()Z Affect(row-cnt:1) cost in 12 ms.
yjqg6666 commented 4 years ago

[arthas@1768]$ watch com.company.login.servlet.LoginValidServlet info Affect(class count: 0 , method count: 0) cost in 29 ms, listenerId: 2 No class or method is affected, try:

  1. sm CLASS_NAME METHOD_NAME to make sure the method you are tracing actually exists (it might be in your parent class).
  2. reset CLASS_NAME and try again, your method body might be too large.
  3. check arthas log: /home/user/logs/arthas/arthas.log
  4. visit https://github.com/alibaba/arthas/issues/47 for more details.

[arthas@1768]$ sc com.company.login.servlet.LoginValidServlet com.company.login.servlet.LoginValidServlet Affect(row-cnt:1) cost in 12 ms.

[arthas@1768]$ sm com.company.login.servlet.LoginValidServlet com.company.login.servlet.LoginValidServlet ()V com.company.login.servlet.LoginValidServlet service(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V com.company.login.servlet.LoginValidServlet info(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V com.company.login.servlet.LoginValidServlet init()V Affect(row-cnt:9) cost in 14 ms.

log:

2020-09-14 19:14:07 [arthas-command-execute] INFO c.t.arthas.core.advisor.Enhancer -enhance matched classes: [class com.company.login.servlet.LoginValidServlet] 2020-09-14 19:14:07 [arthas-command-execute] ERROR c.t.arthas.core.advisor.Enhancer -the classloader can not load SpyAPI, ignore it. classloader: org.apache.catalina.loader.ParallelWebappClassLoader, className: com/company/login/servlet/LoginValidServlet 2020-09-14 19:14:07 [arthas-command-execute] INFO c.t.arthas.core.advisor.Enhancer -Success to batch transform classes: [class com.company.login.servlet.LoginValidServlet]

versions:

Server version: Apache Tomcat/8.5.55 Server built: May 5 2020 22:10:54 UTC Server number: 8.5.55.0 OS Name: Linux OS Version: 3.10.0-957.21.3.el7.x86_64 Architecture: amd64 JVM Version: 1.8.0_252-b09 JVM Vendor: Oracle Corporation

@ralf0131 need help. Maybe Tomcat related.

It's working in my local pc but not working in k8s.

wangyufei123 commented 3 years ago

2020-11-15 22:55:57 [arthas-command-execute] INFO c.t.arthas.core.advisor.Enhancer -Success to batch transform classes: [class weaver.login.VerifyLogin] 2020-11-15 23:05:27 [arthas-command-execute] INFO c.t.arthas.core.advisor.Enhancer -enhance matched classes: [class weaver.login.VerifyLogin] 2020-11-15 23:05:27 [arthas-command-execute] ERROR c.t.arthas.core.advisor.Enhancer -the classloader can not load SpyAPI, ignore it. classloader: com.caucho.loader.EnvironmentClassLoader, className: weaver/login/VerifyLogin

你好，在使用monitor的时候有这样的一个问题

hengyunabc commented 3 years ago

2020-11-15 22:55:57 [arthas-command-execute] INFO c.t.arthas.core.advisor.Enhancer -Success to batch transform classes: [class weaver.login.VerifyLogin] 2020-11-15 23:05:27 [arthas-command-execute] INFO c.t.arthas.core.advisor.Enhancer -enhance matched classes: [class weaver.login.VerifyLogin] 2020-11-15 23:05:27 [arthas-command-execute] ERROR c.t.arthas.core.advisor.Enhancer -the classloader can not load SpyAPI, ignore it. classloader: com.caucho.loader.EnvironmentClassLoader, className: weaver/login/VerifyLogin

你好，在使用monitor的时候有这样的一个问题

这是因为 com.caucho.loader.EnvironmentClassLoader 不支持加载 append 到 bootstrap classloader里的jar，是它的实现问题。后面arthas会尝试支持这种情况，目前不支持。

y3030434 commented 3 years ago

2020-11-15 22:55:57 [arthas-command-execute] INFO c.t.arthas.core.advisor.Enhancer -Success to batch transform classes: [class weaver.login.VerifyLogin] 2020-11-15 23:05:27 [arthas-command-execute] INFO c.t.arthas.core.advisor.Enhancer -enhance matched classes: [class weaver.login.VerifyLogin] 2020-11-15 23:05:27 [arthas-command-execute] ERROR c.t.arthas.core.advisor.Enhancer -the classloader can not load SpyAPI, ignore it. classloader: com.caucho.loader.EnvironmentClassLoader, className: weaver/login/VerifyLogin 你好，在使用monitor的时候有这样的一个问题

这是因为 com.caucho.loader.EnvironmentClassLoader 不支持加载 append 到 bootstrap classloader里的jar，是它的实现问题。后面arthas会尝试支持这种情况，目前不支持。

我这里报的是 the classloader can not load SpyAPI, ignore it. classloader: org.eclipse.jetty.webapp.WebAppClassLoader, className: com/xxx$

请问也是因为.jetty.webapp.WebAppClassLoader 不支持加载append 到 bootstrap classloader里的jar的原因吗？

hengyunabc commented 3 years ago

我这里报的是 the classloader can not load SpyAPI, ignore it. classloader: org.eclipse.jetty.webapp.WebAppClassLoader, className: com/xxx$

请问也是因为.jetty.webapp.WebAppClassLoader 不支持加载append 到 bootstrap classloader里的jar的原因吗？

是的

holylinlhl commented 3 years ago

请问，如果要watch的方法的包名里包含了中文字符，arthas控制台会显示乱码，从而无法监控此类的方法，怎么办？

xiezhaokun commented 3 years ago

不能直接这样使用吗，jdk的类都不能trace吗？

trace --skipJDKMethod false java.text.SimpleDateFormat initialize
hengyunabc commented 3 years ago

不能直接这样使用吗，jdk的类都不能trace吗？

trace --skipJDKMethod false java.text.SimpleDateFormat initialize

仔细看issue里的说明，要打开 unsafe 开关。

Likes123 commented 3 years ago

image image

LancCJ commented 1 year ago

resolve my question, point 5

Code1157 commented 1 year ago

我的类明明有的，为什么用arthas找到类。 No class or method is affected, try:

  1. sm CLASS_NAME METHOD_NAME to make sure the method you are tracing actually exists (it might be in your parent class).
  2. reset CLASS_NAME and try again, your method body might be too large.
  3. check arthas log: /home/tomcat/logs/arthas/arthas.log
  4. visit No class or method is affected/Trace, watch等命令无法找到对应的类和方法 #47 for more details.

image 你可以使用这条命令启动arthas，注意最后面的是服务ID（不是端口号）。在cmd用你启动的项目的port去查服务ID，而不是直接使用IDEA的服务ID，那样没有用。

zhougit86 commented 1 year ago

stack sun.misc.Unsafe allocateMemory. 是不是native. 方法不能监控

hengyunabc commented 1 year ago

pinpoint 里的类参考：

https://github.com/alibaba/arthas/issues/2452

hanbert commented 9 months ago

[arthas@1105]$ sm -d com.alibaba.common.lang.enumeration.Enum createEnum process class failed: com.iwallet.biz.core.enums.InstitutionEnum, error: java.lang.NoClassDefFoundError: com/alibaba/common/resourcebundle/ResourceBundle

类已经确认被加载了，但是确认某个方法的时候，报错了。。。静态类的静态方法。。。

2024-01-24 21:59:40 [arthas-command-execute] ERROR c.t.a.c.c.k.SearchMethodCommand -process class failed: com.iwallet.biz.core.enums.InstitutionEnum, error: java.lang.NoClassDefFoundError: com/alibaba/common/resourcebundle/ResourceBundle java.lang.NoClassDefFoundError: com/alibaba/common/resourcebundle/ResourceBundle at java.base/java.lang.Class.getDeclaredConstructors0(Native Method) at java.base/java.lang.Class.privateGetDeclaredConstructors(Class.java:3549) at java.base/java.lang.Class.getDeclaredConstructors(Class.java:2727) at com.taobao.arthas.core.command.klass100.SearchMethodCommand.process(SearchMethodCommand.java:138) 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.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317) at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) at java.base/java.lang.Thread.run(Thread.java:1583) Caused by: java.lang.ClassNotFoundException: com.alibaba.common.resourcebundle.ResourceBundle at com.alipay.sofa.loader.fast.FastURLClassLoader.findClass(FastURLClassLoader.java:128) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:593) at com.alipay.sofa.loader.fast.FastLaunchedURLClassLoader.loadClass(FastLaunchedURLClassLoader.java:116) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ... 15 common frames omitted

gg159753 commented 7 months ago

trace org.mybatis.spring.transaction.SpringManagedTransaction getConnection -n 5 --skipJDKMethod false 在应用重启后 mybatis下的很多类不能被trace/watch 。看了下也不是动态代理。 只要执行过一次相关代码 就可以trace到了 很奇怪 @hengyunabc