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## Arthas
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[](https://travis-ci.org/alibaba/arthas)
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[](https://codecov.io/gh/alibaba/arthas)
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[](https://search.maven.org/search?q=g:com.taobao.arthas)
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[](http://isitmaintained.com/project/alibaba/arthas "Average time to resolve an issue")
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[](http://isitmaintained.com/project/alibaba/arthas "Percentage of issues still open")
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English version goes [here](README.md).
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`Arthas` 是Alibaba开源的Java诊断工具，深受开发者喜爱。
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当你遇到以下类似问题而束手无策时，`Arthas`可以帮助你解决：
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0. 这个类从哪个 jar 包加载的？为什么会报各种类相关的 Exception？
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0. 我改的代码为什么没有执行到？难道是我没 commit？分支搞错了？
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0. 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？
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0. 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！
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0. 是否有一个全局视角来查看系统的运行状况？
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0. 有什么办法可以监控到JVM的实时运行状态？
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0. 怎么快速定位应用的热点，生成火焰图？
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`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。
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### 在线教程(推荐)
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* [基础教程](https://alibaba.github.io/arthas/arthas-tutorials?language=cn&id=arthas-basics)
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* [进阶教程](https://alibaba.github.io/arthas/arthas-tutorials?language=cn&id=arthas-advanced)
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### 快速开始
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#### 使用`arthas-boot`(推荐)
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下载`arthas-boot.jar`，然后用`java -jar`的方式启动：
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```bash
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curl -O https://alibaba.github.io/arthas/arthas-boot.jar
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java -jar arthas-boot.jar
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```
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打印帮助信息：
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```bash
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java -jar arthas-boot.jar -h
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```
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* 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`
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#### 使用`as.sh`
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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：
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```bash
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curl -L https://alibaba.github.io/arthas/install.sh | sh
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```
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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。
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直接在shell下面执行`./as.sh`，就会进入交互界面。
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也可以执行`./as.sh -h`来获取更多参数信息。
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### 文档
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* [在线教程(推荐)](https://alibaba.github.io/arthas/arthas-tutorials?language=cn)
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* [用户文档](https://alibaba.github.io/arthas/)
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* [安装](https://alibaba.github.io/arthas/install-detail.html)
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* [下载](https://alibaba.github.io/arthas/download.html)
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* [快速入门](https://alibaba.github.io/arthas/quick-start.html)
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* [进阶使用](https://alibaba.github.io/arthas/advanced-use.html)
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* [命令列表](https://alibaba.github.io/arthas/commands.html)
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* [WebConsole](https://alibaba.github.io/arthas/web-console.html)
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* [Docker](https://alibaba.github.io/arthas/docker.html)
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* [用户案例](https://github.com/alibaba/arthas/issues?q=label%3Auser-case)
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* [常见问题](https://github.com/alibaba/arthas/issues?utf8=%E2%9C%93&q=label%3Aquestion-answered+)
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* [编译调试/参与贡献](https://github.com/alibaba/arthas/blob/master/CONTRIBUTING.md)
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* [Release Notes](https://github.com/alibaba/arthas/releases)
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* [QQ群/钉钉群](https://alibaba.github.io/arthas/contact-us.html)
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Gitee文档镜像： https://arthas.gitee.io/
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### 案例展示
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#### Dashboard
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* https://alibaba.github.io/arthas/dashboard
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#### Thread
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* https://alibaba.github.io/arthas/thread
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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？
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```
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$ thread -n 3
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"as-command-execute-daemon" Id=29 cpuUsage=75% RUNNABLE
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at sun.management.ThreadImpl.dumpThreads0(Native Method)
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at sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:440)
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at com.taobao.arthas.core.command.monitor200.ThreadCommand$1.action(ThreadCommand.java:58)
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at com.taobao.arthas.core.command.handler.AbstractCommandHandler.execute(AbstractCommandHandler.java:238)
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at com.taobao.arthas.core.command.handler.DefaultCommandHandler.handleCommand(DefaultCommandHandler.java:67)
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at com.taobao.arthas.core.server.ArthasServer$4.run(ArthasServer.java:276)
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at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
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at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
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at java.lang.Thread.run(Thread.java:745)
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Number of locked synchronizers = 1
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- java.util.concurrent.ThreadPoolExecutor$Worker@6cd0b6f8
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"as-session-expire-daemon" Id=25 cpuUsage=24% TIMED_WAITING
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at java.lang.Thread.sleep(Native Method)
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at com.taobao.arthas.core.server.DefaultSessionManager$2.run(DefaultSessionManager.java:85)
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"Reference Handler" Id=2 cpuUsage=0% WAITING on java.lang.ref.Reference$Lock@69ba0f27
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at java.lang.Object.wait(Native Method)
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- waiting on java.lang.ref.Reference$Lock@69ba0f27
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at java.lang.Object.wait(Object.java:503)
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at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133)
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```
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#### jad
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* https://alibaba.github.io/arthas/jad
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对类进行反编译:
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```java
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$ jad javax.servlet.Servlet
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ClassLoader:
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+-java.net.URLClassLoader@6108b2d7
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+-sun.misc.Launcher$AppClassLoader@18b4aac2
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+-sun.misc.Launcher$ExtClassLoader@1ddf84b8
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Location:
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/Users/xxx/work/test/lib/servlet-api.jar
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/*
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* Decompiled with CFR 0_122.
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*/
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package javax.servlet;
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import java.io.IOException;
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import javax.servlet.ServletConfig;
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import javax.servlet.ServletException;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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public interface Servlet {
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public void init(ServletConfig var1) throws ServletException;
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public ServletConfig getServletConfig();
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public void service(ServletRequest var1, ServletResponse var2) throws ServletException, IOException;
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public String getServletInfo();
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public void destroy();
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}
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```
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#### mc
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* https://alibaba.github.io/arthas/mc
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Memory Compiler/内存编译器，编译`.java`文件生成`.class`。
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```bash
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mc /tmp/Test.java
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```
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#### redefine
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* https://alibaba.github.io/arthas/redefine
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加载外部的`.class`文件，redefine jvm已加载的类。
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```bash
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redefine /tmp/Test.class
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redefine -c 327a647b /tmp/Test.class /tmp/Test\$Inner.class
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```
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#### sc
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* https://alibaba.github.io/arthas/sc
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查找JVM中已经加载的类
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```bash
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$ sc -d org.springframework.web.context.support.XmlWebApplicationContext
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class-info org.springframework.web.context.support.XmlWebApplicationContext
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code-source /Users/xxx/work/test/WEB-INF/lib/spring-web-3.2.11.RELEASE.jar
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name org.springframework.web.context.support.XmlWebApplicationContext
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isInterface false
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isAnnotation false
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isEnum false
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isAnonymousClass false
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isArray false
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isLocalClass false
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isMemberClass false
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isPrimitive false
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isSynthetic false
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simple-name XmlWebApplicationContext
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modifier public
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annotation
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interfaces
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super-class +-org.springframework.web.context.support.AbstractRefreshableWebApplicationContext
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+-org.springframework.context.support.AbstractRefreshableConfigApplicationContext
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+-org.springframework.context.support.AbstractRefreshableApplicationContext
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+-org.springframework.context.support.AbstractApplicationContext
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+-org.springframework.core.io.DefaultResourceLoader
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+-java.lang.Object
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class-loader +-org.apache.catalina.loader.ParallelWebappClassLoader
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+-java.net.URLClassLoader@6108b2d7
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+-sun.misc.Launcher$AppClassLoader@18b4aac2
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+-sun.misc.Launcher$ExtClassLoader@1ddf84b8
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classLoaderHash 25131501
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```
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#### stack
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* https://alibaba.github.io/arthas/stack
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查看方法 `test.arthas.TestStack#doGet` 的调用堆栈：
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```bash
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$ stack test.arthas.TestStack doGet
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 286 ms.
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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
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@test.arthas.TestStack.doGet()
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at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
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at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
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at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
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at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
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at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
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at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
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at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
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at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
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at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
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at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
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at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
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...
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at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
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at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
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at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
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at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:451)
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at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1121)
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at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
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at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
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at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
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at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
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at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
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at java.lang.Thread.run(Thread.java:745)
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```
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#### Trace
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* https://alibaba.github.io/arthas/trace
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观察方法执行的时候哪个子调用比较慢:
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#### Watch
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* https://alibaba.github.io/arthas/watch
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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。
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```bash
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$ watch test.arthas.TestWatch doGet {params[0], throwExp} -e
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 65 ms.
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ts=2018-09-18 10:26:28;result=@ArrayList[
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@RequestFacade[org.apache.catalina.connector.RequestFacade@79f922b2],
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@NullPointerException[java.lang.NullPointerException],
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]
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```
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#### Monitor
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* https://alibaba.github.io/arthas/monitor
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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。
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```bash
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$ monitor -c 5 org.apache.dubbo.demo.provider.DemoServiceImpl sayHello
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 109 ms.
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timestamp class method total success fail avg-rt(ms) fail-rate
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----------------------------------------------------------------------------------------------------------------------------
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2018-09-20 09:45:32 org.apache.dubbo.demo.provider.DemoServiceImpl sayHello 5 5 0 0.67 0.00%
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timestamp class method total success fail avg-rt(ms) fail-rate
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----------------------------------------------------------------------------------------------------------------------------
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2018-09-20 09:45:37 org.apache.dubbo.demo.provider.DemoServiceImpl sayHello 5 5 0 1.00 0.00%
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timestamp class method total success fail avg-rt(ms) fail-rate
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----------------------------------------------------------------------------------------------------------------------------
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2018-09-20 09:45:42 org.apache.dubbo.demo.provider.DemoServiceImpl sayHello 5 5 0 0.43 0.00%
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```
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#### Time Tunnel(tt)
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* https://alibaba.github.io/arthas/tt
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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。
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```bash
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$ tt -t org.apache.dubbo.demo.provider.DemoServiceImpl sayHello
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 75 ms.
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INDEX TIMESTAMP COST(ms) IS-RET IS-EXP OBJECT CLASS METHOD
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-------------------------------------------------------------------------------------------------------------------------------------
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1000 2018-09-20 09:54:10 1.971195 true false 0x55965cca DemoServiceImpl sayHello
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1001 2018-09-20 09:54:11 0.215685 true false 0x55965cca DemoServiceImpl sayHello
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1002 2018-09-20 09:54:12 0.236303 true false 0x55965cca DemoServiceImpl sayHello
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1003 2018-09-20 09:54:13 0.159598 true false 0x55965cca DemoServiceImpl sayHello
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1004 2018-09-20 09:54:14 0.201982 true false 0x55965cca DemoServiceImpl sayHello
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1005 2018-09-20 09:54:15 0.214205 true false 0x55965cca DemoServiceImpl sayHello
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1006 2018-09-20 09:54:16 0.241863 true false 0x55965cca DemoServiceImpl sayHello
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1007 2018-09-20 09:54:17 0.305747 true false 0x55965cca DemoServiceImpl sayHello
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1008 2018-09-20 09:54:18 0.18468 true false 0x55965cca DemoServiceImpl sayHello
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```
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#### Classloader
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* https://alibaba.github.io/arthas/classloader
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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。
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```bash
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$ classloader
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name numberOfInstances loadedCountTotal
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BootstrapClassLoader 1 3346
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com.taobao.arthas.agent.ArthasClassloader 1 1262
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java.net.URLClassLoader 2 1033
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org.apache.catalina.loader.ParallelWebappClassLoader 1 628
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sun.reflect.DelegatingClassLoader 166 166
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sun.misc.Launcher$AppClassLoader 1 31
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com.alibaba.fastjson.util.ASMClassLoader 6 15
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sun.misc.Launcher$ExtClassLoader 1 7
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org.jvnet.hk2.internal.DelegatingClassLoader 2 2
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sun.reflect.misc.MethodUtil 1 1
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```
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#### Web Console
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* https://alibaba.github.io/arthas/web-console
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#### Profiler/FlameGraph/火焰图
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* https://alibaba.github.io/arthas/profiler
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```bash
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$ profiler start
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Started [cpu] profiling
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```
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```
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$ profiler stop
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profiler output file: /tmp/demo/arthas-output/20191125-135546.svg
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OK
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```
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通过浏览器查看profiler结果：
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### Known Users
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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）
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### 洐生项目
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* [Bistoury: 一个集成了Arthas的项目](https://github.com/qunarcorp/bistoury)
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* [一个使用MVEL脚本的fork](https://github.com/XhinLiang/arthas)
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### Credit
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#### Contributors
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感谢所有Contributors!
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<a href="https://github.com/alibaba/arthas/graphs/contributors"><img src="https://opencollective.com/arthas/contributors.svg?width=890&button=false" /></a>
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#### Projects
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* [greys-anatomy](https://github.com/oldmanpushcart/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！
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* [termd](https://github.com/alibaba/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。
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* [crash](https://github.com/crashub/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](https://github.com/crashub/crash/tree/1.3.2/shell)看到源码，感谢crash在这方面所做的优秀工作。
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* [cli](https://github.com/alibaba/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。
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* [compiler](https://github.com/skalogs/SkaETL/tree/master/compiler) Arthas里的内存编译器代码来源
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* [Apache Commons Net](https://commons.apache.org/proper/commons-net/) Arthas里的Telnet Client代码来源
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* [async-profiler](https://github.com/jvm-profiling-tools/async-profiler) Arthas's profiler 命令.
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### 仓库镜像
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* [码云Arthas](https://gitee.com/arthas/arthas)
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