mirror of
https://gitee.com/arthas/arthas.git
synced 2024-11-30 03:07:37 +08:00
Hollow Man
GitHub
parent
1179fe16be
commit
f125099387
@ -0,0 +1,16 @@
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在新的`Terminal 2`里，下载`arthas-boot.jar`，再用`java -jar`命令启动：
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`wget https://arthas.aliyun.com/doc/arthas-boot.jar
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java -jar arthas-boot.jar`{{execute T2}}
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`arthas-boot`是`Arthas`的启动程序，它启动后，会列出所有的Java进程，用户可以选择需要诊断的目标进程。
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选择第一个进程，输入 `1`{{execute T2}} ，再`Enter/回车`：
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Attach成功之后，会打印Arthas LOGO。输入 `help`{{execute T2}} 可以获取到更多的帮助信息。
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@ -0,0 +1,168 @@
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### 现象
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目前，访问 http://localhost/user/0 ，会返回500异常：
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`curl http://localhost/user/0`{{execute T3}}
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```
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{"timestamp":1550223186170,"status":500,"error":"Internal Server Error","exception":"java.lang.IllegalArgumentException","message":"id < 1","path":"/user/0"}
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```
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但请求的具体参数，异常栈是什么呢？
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### 查看UserController的 参数/异常
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在Arthas里执行：
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`watch com.example.demo.arthas.user.UserController * '{params, throwExp}'`{{execute T2}}
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1. 第一个参数是类名，支持通配
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2. 第二个参数是函数名，支持通配
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访问 `curl http://localhost/user/0`{{execute T3}} ,`watch`命令会打印调用的参数和异常
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```bash
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$ watch com.example.demo.arthas.user.UserController * '{params, throwExp}'
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Press Q or Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:2) cost in 53 ms.
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ts=2019-02-15 01:35:25; [cost=0.996655ms] result=@ArrayList[
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@Object[][isEmpty=false;size=1],
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@IllegalArgumentException[java.lang.IllegalArgumentException: id < 1],
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]
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```
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可以看到实际抛出的异常是`IllegalArgumentException`。
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可以输入 `Q`{{execute T2}} 或者 `Ctrl+C` 退出watch命令。
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如果想把获取到的结果展开，可以用`-x`参数：
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`watch com.example.demo.arthas.user.UserController * '{params, throwExp}' -x 2`{{execute T2}}
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```bash
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$ watch com.example.demo.arthas.user.UserController * '{params, throwExp}' -x 2
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Press Q or Ctrl+C to abort.
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Affect(class count: 1 , method count: 2) cost in 190 ms, listenerId: 1
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ts=2020-08-13 05:22:45; [cost=4.805432ms] result=@ArrayList[
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@Object[][
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@Integer[0],
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],
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java.lang.IllegalArgumentException: id < 1
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at com.example.demo.arthas.user.UserController.findUserById(UserController.java:19)
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at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
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at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
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at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
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at java.lang.reflect.Method.invoke(Method.java:498)
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at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
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at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
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at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)
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at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
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at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
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at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
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at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
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at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
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at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
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at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
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at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
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at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
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at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
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at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
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at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
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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:193)
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at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
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at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
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at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
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at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
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at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
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at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)
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at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
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at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
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at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
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at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
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at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
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at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
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at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
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at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
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at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
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at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
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at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
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at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
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at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
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at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)
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at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
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at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
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at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
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at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
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at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
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at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
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at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
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at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468)
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at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
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at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
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at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
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at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
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at java.lang.Thread.run(Thread.java:748)
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,
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]
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```
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### 返回值表达式
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在上面的例子里，第三个参数是`返回值表达式`，它实际上是一个`ognl`表达式，它支持一些内置对象：
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* loader
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* clazz
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* method
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* target
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* params
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* returnObj
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* throwExp
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* isBefore
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* isThrow
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* isReturn
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你可以利用这些内置对象来组成不同的表达式。比如返回一个数组：
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`watch com.example.demo.arthas.user.UserController * '{params[0], target, returnObj}'`{{execute T2}}
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更多参考： https://arthas.aliyun.com/doc/advice-class.html
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### 条件表达式
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`watch`命令支持在第4个参数里写条件表达式，比如：
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`watch com.example.demo.arthas.user.UserController * returnObj 'params[0] > 100'`{{execute T2}}
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当访问 https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/user/1 时，`watch`命令没有输出
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当访问 https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/user/101 时，`watch`会打印出结果。
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```bash
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$ watch com.example.demo.arthas.user.UserController * returnObj 'params[0] > 100'
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Press Q or Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:2) cost in 47 ms.
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ts=2019-02-13 19:42:12; [cost=0.821443ms] result=@User[
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id=@Integer[101],
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name=@String[name101],
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]
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```
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### 当异常时捕获
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`watch`命令支持`-e`选项，表示只捕获抛出异常时的请求：
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`watch com.example.demo.arthas.user.UserController * "{params[0],throwExp}" -e`{{execute T2}}
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### 按照耗时进行过滤
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watch命令支持按请求耗时进行过滤，比如：
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`watch com.example.demo.arthas.user.UserController * '{params, returnObj}' '#cost>200'`{{execute T2}}
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10
tutorials/katacoda/case-watch-method-exception-cn/finish.md
Normal file
10
tutorials/katacoda/case-watch-method-exception-cn/finish.md
Normal file
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通过本教程基本掌握了Arthas排查函数调用异常。更多高级特性，可以在下面的进阶指南里继续了解。
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* [Arthas进阶](https://arthas.aliyun.com/doc/arthas-tutorials?language=cn&id=arthas-advanced)
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* [Arthas Github](https://github.com/alibaba/arthas)
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* [Arthas 文档](https://arthas.aliyun.com/doc/)
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欢迎关注公众号，获取Arthas项目的信息，源码分析，案例实践。
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45
tutorials/katacoda/case-watch-method-exception-cn/index.json
Normal file
45
tutorials/katacoda/case-watch-method-exception-cn/index.json
Normal file
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{
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"title": "Arthas 排查函数调用异常 案例",
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"description": "Arthas 排查函数调用异常 案例",
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"difficulty": "高级使用者",
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"time": "10分钟",
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"details": {
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"steps": [
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{
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"title": "Start demo",
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"text": "start-demo.md"
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},
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{
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"title": "Start arthas-boot",
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"text": "arthas-boot.md"
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},
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{
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"title": "排查函数调用异常",
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"text": "case-watch-method-exception.md"
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}
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],
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"intro": {
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"text": "intro.md"
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},
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"finish": {
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"text": "finish.md"
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},
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"assets": {
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"host01": []
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}
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},
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"environment": {
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"uilayout": "terminal",
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"showdashboard": true,
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"dashboards": [
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{
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"name": "Web Port 80",
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"port": 80
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}
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]
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},
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"backend": {
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"imageid": "java",
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"environmentsprotocol": "http"
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}
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}
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11
tutorials/katacoda/case-watch-method-exception-cn/intro.md
Normal file
11
tutorials/katacoda/case-watch-method-exception-cn/intro.md
Normal file
@ -0,0 +1,11 @@
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`Arthas` 是Alibaba开源的Java诊断工具，深受开发者喜爱。在线排查问题，无需重启；动态跟踪Java代码；实时监控JVM状态。
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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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* Github: https://github.com/alibaba/arthas
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* 文档: https://arthas.aliyun.com/doc/
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@ -0,0 +1,14 @@
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下载`demo-arthas-spring-boot.jar`，再用`java -jar`命令启动：
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`wget https://github.com/hengyunabc/spring-boot-inside/raw/master/demo-arthas-spring-boot/demo-arthas-spring-boot.jar
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java -jar demo-arthas-spring-boot.jar`{{execute T1}}
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`demo-arthas-spring-boot`是一个很简单的spring boot应用，源代码：[查看](https://github.com/hengyunabc/spring-boot-inside/tree/master/demo-arthas-spring-boot)
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启动之后，可以访问80端口： https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com
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@ -0,0 +1,16 @@
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In the new `Terminal 2`, download `arthas-boot.jar` and start with the `java -jar` command:
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`wget https://arthas.aliyun.com/doc/arthas-boot.jar
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java -jar arthas-boot.jar`{{execute T2}}
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`arthas-boot` is the launcher for `Arthas`. It lists all the Java processes, and the user can select the target process to be diagnosed.
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Select the first process, type `1`{{execute T2}} ，then type `Enter`：
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After the Attach is successful, Arthas LOGO is printed. Enter `help`{{execute T2}} for more help.
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||||
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@ -0,0 +1,116 @@
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||||
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Currently, visiting http://localhost/user/0 will return a 500 error:
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`curl http://localhost/user/0`{{execute T3}}
|
||||
|
||||
```
|
||||
{"timestamp":1550223186170,"status":500,"error":"Internal Server Error","exception":"java.lang.IllegalArgumentException","message":"id < 1","path":"/user/0"}
|
||||
```
|
||||
|
||||
But what are the specific parameters of the request, what is the exception stack?
|
||||
|
||||
### View the parameters/exception of UserController
|
||||
|
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Execute in Arthas:
|
||||
|
||||
`watch com.example.demo.arthas.user.UserController * '{params, throwExp}'`{{execute T2}}
|
||||
|
||||
|
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1. The first argument is the class name, which supports wildcards.
|
||||
2. The second argument is the function name, which supports wildcards.
|
||||
|
||||
Visit `curl http://localhost/user/0`{{execute T3}} , the `watch` command will print the parameters and exception
|
||||
|
||||
```bash
|
||||
$ watch com.example.demo.arthas.user.UserController * '{params, throwExp}'
|
||||
Press Q or Ctrl+C to abort.
|
||||
Affect(class-cnt:1 , method-cnt:2) cost in 53 ms.
|
||||
ts=2019-02-15 01:35:25; [cost=0.996655ms] result=@ArrayList[
|
||||
@Object[][isEmpty=false;size=1],
|
||||
@IllegalArgumentException[java.lang.IllegalArgumentException: id < 1],
|
||||
]
|
||||
```
|
||||
|
||||
|
||||
The user can see that the actual thrown exception is `IllegalArgumentException`.
|
||||
|
||||
The user can exit the watch command by typing `Q`{{execute T2}} or `Ctrl+C`.
|
||||
|
||||
If the user want to expand the result, can use the `-x` option:
|
||||
|
||||
`watch com.example.demo.arthas.user.UserController * '{params, throwExp}' -x 2`{{execute T2}}
|
||||
|
||||
```bash
|
||||
$ watch com.example.demo.arthas.user.UserController * '{params, throwExp}' -x 2
|
||||
Press Q or Ctrl+C to abort.
|
||||
Affect(class count: 1 , method count: 2) cost in 190 ms, listenerId: 1
|
||||
ts=2020-08-13 05:22:45; [cost=4.805432ms] result=@ArrayList[
|
||||
@Object[][
|
||||
@Integer[0],
|
||||
],
|
||||
java.lang.IllegalArgumentException: id < 1
|
||||
at com.example.demo.arthas.user.UserController.findUserById(UserController.java:19)
|
||||
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
|
||||
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
|
||||
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
|
||||
...
|
||||
,
|
||||
]
|
||||
```
|
||||
|
||||
### The return value expression
|
||||
|
||||
In the above example, the third argument is the `return value expression`, which is actually an `ognl` expression that supports some built-in objects:
|
||||
|
||||
* loader
|
||||
* clazz
|
||||
* method
|
||||
* target
|
||||
* params
|
||||
* returnObj
|
||||
* throwExp
|
||||
* isBefore
|
||||
* isThrow
|
||||
* isReturn
|
||||
|
||||
You can use these built-in objects in the expressions. For example, return an array:
|
||||
|
||||
`watch com.example.demo.arthas.user.UserController * '{params[0], target, returnObj}'`{{execute T2}}
|
||||
|
||||
|
||||
More references: https://arthas.aliyun.com/doc/en/advice-class.html
|
||||
|
||||
|
||||
### The conditional expression
|
||||
|
||||
The `watch` command supports conditional expressions in the fourth argument, such as:
|
||||
|
||||
`watch com.example.demo.arthas.user.UserController * returnObj 'params[0] > 100'`{{execute T2}}
|
||||
|
||||
When visit https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/user/1 , the `watch` command print nothing.
|
||||
|
||||
When visit https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/user/101 , the `watch` command will print:
|
||||
|
||||
```bash
|
||||
$ watch com.example.demo.arthas.user.UserController * returnObj 'params[0] > 100'
|
||||
Press Q or Ctrl+C to abort.
|
||||
Affect(class-cnt:1 , method-cnt:2) cost in 47 ms.
|
||||
ts=2019-02-13 19:42:12; [cost=0.821443ms] result=@User[
|
||||
id=@Integer[101],
|
||||
name=@String[name101],
|
||||
]
|
||||
```
|
||||
|
||||
### Capture when an exception occurs
|
||||
|
||||
The `watch` command supports the `-e` option, which means that only requests that throw an exception are caught:
|
||||
|
||||
`watch com.example.demo.arthas.user.UserController * "{params[0],throwExp}" -e`{{execute T2}}
|
||||
|
||||
|
||||
### Filter by cost
|
||||
|
||||
The watch command supports filtering by cost, such as:
|
||||
|
||||
`watch com.example.demo.arthas.user.UserController * '{params, returnObj}' '#cost>200'`{{execute T2}}
|
||||
@ -0,0 +1,6 @@
|
||||
|
||||
Through this tutorial, you can know how to Troubleshooting method invoke exception. More advanced features can be found in the Advanced Guide below.
|
||||
|
||||
* [Arthas Advanced](https://arthas.aliyun.com/doc/arthas-tutorials?language=en&id=arthas-advanced)
|
||||
* [Arthas Github](https://github.com/alibaba/arthas)
|
||||
* [Arthas Documentation](https://arthas.aliyun.com/doc/en)
|
||||
45
tutorials/katacoda/case-watch-method-exception-en/index.json
Normal file
45
tutorials/katacoda/case-watch-method-exception-en/index.json
Normal file
@ -0,0 +1,45 @@
|
||||
{
|
||||
"title": "Arthas Troubleshooting method invoke exception",
|
||||
"description": "Arthas Troubleshooting method invoke exception",
|
||||
"difficulty": "expert",
|
||||
"time": "10 minutes",
|
||||
"details": {
|
||||
"steps": [
|
||||
{
|
||||
"title": "Start demo",
|
||||
"text": "start-demo.md"
|
||||
},
|
||||
{
|
||||
"title": "Start arthas-boot",
|
||||
"text": "arthas-boot.md"
|
||||
},
|
||||
{
|
||||
"title": "Troubleshooting method invoke exception",
|
||||
"text": "case-watch-method-exception.md"
|
||||
}
|
||||
],
|
||||
"intro": {
|
||||
"text": "intro.md"
|
||||
},
|
||||
"finish": {
|
||||
"text": "finish.md"
|
||||
},
|
||||
"assets": {
|
||||
"host01": []
|
||||
}
|
||||
},
|
||||
"environment": {
|
||||
"uilayout": "terminal",
|
||||
"showdashboard": true,
|
||||
"dashboards": [
|
||||
{
|
||||
"name": "Web Port 80",
|
||||
"port": 80
|
||||
}
|
||||
]
|
||||
},
|
||||
"backend": {
|
||||
"imageid": "java",
|
||||
"environmentsprotocol": "http"
|
||||
}
|
||||
}
|
||||
11
tutorials/katacoda/case-watch-method-exception-en/intro.md
Normal file
11
tutorials/katacoda/case-watch-method-exception-en/intro.md
Normal file
@ -0,0 +1,11 @@
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
`Arthas` is a Java diagnostic tool open-sourced by Alibaba middleware team. Arthas helps developers in trouble-shooting issues in production environment for Java based applications without modifying code or restarting servers.
|
||||
|
||||
`Arthas` supports JDK 6+, supports Linux/Mac/Windows.
|
||||
|
||||
* Github: https://github.com/alibaba/arthas
|
||||
* Documentation: https://arthas.aliyun.com/doc/en
|
||||
@ -0,0 +1,14 @@
|
||||
|
||||
|
||||
|
||||
|
||||
Download `demo-arthas-spring-boot.jar`, and start with `java -jar` command:
|
||||
|
||||
`wget https://github.com/hengyunabc/spring-boot-inside/raw/master/demo-arthas-spring-boot/demo-arthas-spring-boot.jar
|
||||
java -jar demo-arthas-spring-boot.jar`{{execute T1}}
|
||||
|
||||
`demo-arthas-spring-boot` is a simple Spring Boot demo, the source code here: [View](https://github.com/hengyunabc/spring-boot-inside/tree/master/demo-arthas-spring-boot)
|
||||
|
||||
After booting, access port 80: https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user