Gitee 推荐 | Java 诊断工具 Arthas

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Arthas

Gitee 推荐 | Java 诊断工具 Arthas

Gitee 推荐 | Java 诊断工具 Arthas
Gitee 推荐 | Java 诊断工具 Arthas
Gitee 推荐 | Java 诊断工具 Arthas
Gitee 推荐 | Java 诊断工具 Arthas
Gitee 推荐 | Java 诊断工具 Arthas
Gitee 推荐 | Java 诊断工具 Arthas

English version goes here.

Arthas 是Alibaba开源Java诊断工具,深受开发者喜爱。

当你遇到以下类似问题而束手无策时,Arthas可以帮助你解决:

  1. 这个类从哪个 jar 包加载的?为什么会报各种类相关的 Exception?
  2. 我改的代码为什么没有执行到?难道是我没 commit?分支搞错了?
  3. 遇到问题无法在线上 debug,难道只能通过加日志再重新发布吗?
  4. 线上遇到某个用户的数据处理有问题,但线上同样无法 debug,线下无法重现!
  5. 是否有一个全局视角来查看系统的运行状况?
  6. 有什么办法可以监控到JVM的实时运行状态?
  7. 怎么快速定位应用的热点,生成火焰图?
  8. 怎样直接从JVM内查找某个类的实例?

Arthas支持JDK 6+,支持Linux/Mac/Windows,采用命令行交互模式,同时提供丰富的 Tab 自动补全功能,进一步方便进行问题的定位和诊断。

在线教程(推荐)

快速开始

使用arthas-boot(推荐)

下载arthas-boot.jar,然后用java -jar的方式启动:

curl -O https://arthas.aliyun.com/arthas-boot.jar
java -jar arthas-boot.jar

打印帮助信息:

java -jar arthas-boot.jar -h

  • 如果下载速度比较慢,可以使用aliyun的镜像:java -jar arthas-boot.jar --repo-mirror aliyun --use-http

使用as.sh

Arthas 支持在 Linux/Unix/Mac 等平台上一键安装,请复制以下内容,并粘贴到命令行中,敲 回车 执行即可:

curl -L https://arthas.aliyun.com/install.sh | sh

上述命令会下载启动脚本文件 as.sh 到当前目录,你可以放在任何地方或将其加入到 $PATH 中。

直接在shell下面执行./as.sh,就会进入交互界面。

也可以执行./as.sh -h来获取更多参数信息。

文档

案例展示

Dashboard

Gitee 推荐 | Java 诊断工具 Arthas

Thread

一目了然的了解系统的状态,哪些线程比较占cpu?他们到底在做什么?

$ thread -n 3
“as-command-execute-daemon” Id=29 cpuUsage=75% RUNNABLE
at sun.management.ThreadImpl.dumpThreads0(Native Method)
at sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:440)
at com.taobao.arthas.core.command.monitor200.ThreadCommand$1.action(ThreadCommand.java:58)
at com.taobao.arthas.core.command.handler.AbstractCommandHandler.execute(AbstractCommandHandler.java:238)
at com.taobao.arthas.core.command.handler.DefaultCommandHandler.handleCommand(DefaultCommandHandler.java:67)
at com.taobao.arthas.core.server.ArthasServer$4.run(ArthasServer.java:276)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)

Number of locked synchronizers = 1
– java.util.concurrent.ThreadPoolExecutor$Worker@6cd0b6f8

“as-session-expire-daemon” Id=25 cpuUsage=24% TIMED_WAITING
at java.lang.Thread.sleep(Native Method)
at com.taobao.arthas.core.server.DefaultSessionManager$2.run(DefaultSessionManager.java:85)

“Reference Handler” Id=2 cpuUsage=0% WAITING on java.lang.ref.Reference$Lock@69ba0f27
at java.lang.Object.wait(Native Method)
– waiting on java.lang.ref.Reference$Lock@69ba0f27
at java.lang.Object.wait(Object.java:503)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133)

jad

对类进行反编译:

$ jad javax.servlet.Servlet

ClassLoader:
+-java.net.URLClassLoader@6108b2d7
+-sun.misc.Launcher$AppClassLoader@18b4aac2
+-sun.misc.Launcher$ExtClassLoader@1ddf84b8

Location:
/Users/xxx/work/test/lib/servletapi.jar

/*
* Decompiled with CFR 0_122.
*/
package javax.servlet;

import java.io.IOException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public interface Servlet {
public void init(ServletConfig var1) throws ServletException;

public ServletConfig getServletConfig();

public void service(ServletRequest var1, ServletResponse var2) throws ServletException, IOException;

public String getServletInfo();

public void destroy();
}

mc

Memory Compiler/内存编译器,编译.java文件生成.class

mc /tmp/Test.java

retransform

加载外部的.class文件,retransform 热更新jvm已加载的类。

retransform /tmp/Test.class
retransform -c 327a647b /tmp/Test.class /tmp/Test$Inner.class

sc

查找JVM中已经加载的类

$ sc -d org.springframework.web.context.support.XmlWebApplicationContext
class-info org.springframework.web.context.support.XmlWebApplicationContext
code-source /Users/xxx/work/test/WEB-INF/lib/spring-web-3.2.11.RELEASE.jar
name org.springframework.web.context.support.XmlWebApplicationContext
isInterface false
isAnnotation false
isEnum false
isAnonymousClass false
isArray false
isLocalClass false
isMemberClass false
isPrimitive false
isSynthetic false
simple-name XmlWebApplicationContext
modifier public
annotation
interfaces
super-class +-org.springframework.web.context.support.AbstractRefreshableWebApplicationContext
+-org.springframework.context.support.AbstractRefreshableConfigApplicationContext
+-org.springframework.context.support.AbstractRefreshableApplicationContext
+-org.springframework.context.support.AbstractApplicationContext
+-org.springframework.core.io.DefaultResourceLoader
+-java.lang.Object
class-loader +-org.apache.catalina.loader.ParallelWebappClassLoader
+-java.net.URLClassLoader@6108b2d7
+-sun.misc.Launcher$AppClassLoader@18b4aac2
+-sun.misc.Launcher$ExtClassLoader@1ddf84b8
classLoaderHash 25131501

vmtool

从JVM heap中获取指定类的实例。

$ vmtool –action getInstances –className java.lang.String –limit 10
@String[][
@String[com/taobao/arthas/core/shell/session/Session],
@String[com.taobao.arthas.core.shell.session.Session],
@String[com/taobao/arthas/core/shell/session/Session],
@String[com/taobao/arthas/core/shell/session/Session],
@String[com/taobao/arthas/core/shell/session/Session.class],
@String[com/taobao/arthas/core/shell/session/Session.class],
@String[com/taobao/arthas/core/shell/session/Session.class],
@String[com/],
@String[java/util/concurrent/ConcurrentHashMap$ValueIterator],
@String[java/util/concurrent/locks/LockSupport],
]

stack

查看方法 test.arthas.TestStack#doGet 的调用堆栈:

$ stack test.arthas.TestStack doGet
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 286 ms.
ts=2018-09-18 10:11:45;thread_name=http-bio-8080-exec-10;id=d9;is_daemon=true;priority=5;TCCL=org.apache.catalina.loader.ParallelWebappClassLoader@25131501
@test.arthas.TestStack.doGet()
at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:451)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1121)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)

Trace

观察方法执行的时候哪个子调用比较慢:

Gitee 推荐 | Java 诊断工具 Arthas

Watch

观察方法 test.arthas.TestWatch#doGet 执行的入参,仅当方法抛出异常时才输出。

$ watch test.arthas.TestWatch doGet {params[0], throwExp} -e
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 65 ms.
ts=2018-09-18 10:26:28;result=@ArrayList[
@RequestFacade[org.apache.catalina.connector.RequestFacade@79f922b2],
@NullPointerException[java.lang.NullPointerException],
]

Monitor

监控某个特殊方法的调用统计数据,包括总调用次数,平均rt,成功率等信息,每隔5秒输出一次。

$ monitor -c 5 org.apache.dubbo.demo.provider.DemoServiceImpl sayHello
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 109 ms.
timestamp class method total success fail avg-rt(ms) fail-rate
—————————————————————————————————————————-
2018-09-20 09:45:32 org.apache.dubbo.demo.provider.DemoServiceImpl sayHello 5 5 0 0.67 0.00%

timestamp class method total success fail avg-rt(ms) fail-rate
—————————————————————————————————————————-
2018-09-20 09:45:37 org.apache.dubbo.demo.provider.DemoServiceImpl sayHello 5 5 0 1.00 0.00%

timestamp class method total success fail avg-rt(ms) fail-rate
—————————————————————————————————————————-
2018-09-20 09:45:42 org.apache.dubbo.demo.provider.DemoServiceImpl sayHello 5 5 0 0.43 0.00%

Time Tunnel(tt)

记录方法调用信息,支持事后查看方法调用的参数,返回值,抛出的异常等信息,仿佛穿越时空隧道回到调用现场一般。

$ tt -t org.apache.dubbo.demo.provider.DemoServiceImpl sayHello
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 75 ms.
INDEX TIMESTAMP COST(ms) IS-RET IS-EXP OBJECT CLASS METHOD
————————————————————————————————————————————-
1000 2018-09-20 09:54:10 1.971195 true false 0x55965cca DemoServiceImpl sayHello
1001 2018-09-20 09:54:11 0.215685 true false 0x55965cca DemoServiceImpl sayHello
1002 2018-09-20 09:54:12 0.236303 true false 0x55965cca DemoServiceImpl sayHello
1003 2018-09-20 09:54:13 0.159598 true false 0x55965cca DemoServiceImpl sayHello
1004 2018-09-20 09:54:14 0.201982 true false 0x55965cca DemoServiceImpl sayHello
1005 2018-09-20 09:54:15 0.214205 true false 0x55965cca DemoServiceImpl sayHello
1006 2018-09-20 09:54:16 0.241863 true false 0x55965cca DemoServiceImpl sayHello
1007 2018-09-20 09:54:17 0.305747 true false 0x55965cca DemoServiceImpl sayHello
1008 2018-09-20 09:54:18 0.18468 true false 0x55965cca DemoServiceImpl sayHello

Classloader

了解当前系统中有多少类加载器,以及每个加载器加载的类数量,帮助您判断是否有类加载器泄露。

$ classloader
name numberOfInstances loadedCountTotal
BootstrapClassLoader 1 3346
com.taobao.arthas.agent.ArthasClassloader 1 1262
java.net.URLClassLoader 2 1033
org.apache.catalina.loader.ParallelWebappClassLoader 1 628
sun.reflect.DelegatingClassLoader 166 166
sun.misc.Launcher$AppClassLoader 1 31
com.alibaba.fastjson.util.ASMClassLoader 6 15
sun.misc.Launcher$ExtClassLoader 1 7
org.jvnet.hk2.internal.DelegatingClassLoader 2 2
sun.reflect.misc.MethodUtil 1 1

Web Console

Gitee 推荐 | Java 诊断工具 Arthas

Profiler/FlameGraph/火焰图

$ profiler start
Started [cpu] profiling

$ profiler stop
profiler output file: /tmp/demo/arthas-output/20211207-111550.html
OK

通过浏览器查看profiler结果:

Gitee 推荐 | Java 诊断工具 Arthas

Arthas Spring Boot Starter

Known Users

Arthas有超过120家登记用户,查看全部

如果您在使用Arthas,请让我们知道,您的使用对我们非常重要:https://github.com/alibaba/arthas/issues/111 (按登记顺序排列)

Gitee 推荐 | Java 诊断工具 Arthas
Gitee 推荐 | Java 诊断工具 Arthas
Gitee 推荐 | Java 诊断工具 Arthas
Gitee 推荐 | Java 诊断工具 Arthas
Gitee 推荐 | Java 诊断工具 Arthas
Gitee 推荐 | Java 诊断工具 Arthas
Gitee 推荐 | Java 诊断工具 Arthas
Gitee 推荐 | Java 诊断工具 Arthas
Gitee 推荐 | Java 诊断工具 Arthas
Gitee 推荐 | Java 诊断工具 Arthas
Gitee 推荐 | Java 诊断工具 Arthas
Gitee 推荐 | Java 诊断工具 Arthas
Gitee 推荐 | Java 诊断工具 Arthas

衍生项目

Credit

Contributors

感谢所有Contributors!

Gitee 推荐 | Java 诊断工具 Arthas

Projects

  • bytekit Java Bytecode Kit,Arthas里字节码增强的内核。
  • greys-anatomy: Arthas代码基于Greys二次开发而来,非常感谢Greys之前所有的工作,以及Greys原作者对Arthas提出的意见和建议!
  • termd: Arthas的命令行实现基于termd开发,是一款优秀的命令行程序开发框架,感谢termd提供了优秀的框架。
  • crash: Arthas的文本渲染功能基于crash中的文本渲染功能开发,可以从这里看到源码,感谢crash在这方面所做的优秀工作。
  • cli: Arthas的命令行界面基于vert.x提供的cli库进行开发,感谢vert.x在这方面做的优秀工作。
  • compiler Arthas里的内存编译器代码来源
  • Apache Commons Net Arthas里的Telnet Client代码来源
  • async-profiler Arthas’s profiler 命令.

仓库镜像

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