From f125099387c55fafdc201153fd30d4a51f96044f Mon Sep 17 00:00:00 2001 From: Hollow Man Date: Thu, 13 Aug 2020 14:52:09 +0800 Subject: [PATCH] add Troubleshooting method invoke exception case scenario #847 (#1335) --- .../arthas-boot.md | 16 ++ .../case-watch-method-exception.md | 168 ++++++++++++++++++ .../case-watch-method-exception-cn/finish.md | 10 ++ .../case-watch-method-exception-cn/index.json | 45 +++++ .../case-watch-method-exception-cn/intro.md | 11 ++ .../start-demo.md | 14 ++ .../arthas-boot.md | 16 ++ .../case-watch-method-exception.md | 116 ++++++++++++ .../case-watch-method-exception-en/finish.md | 6 + .../case-watch-method-exception-en/index.json | 45 +++++ .../case-watch-method-exception-en/intro.md | 11 ++ .../start-demo.md | 14 ++ 12 files changed, 472 insertions(+) create mode 100644 tutorials/katacoda/case-watch-method-exception-cn/arthas-boot.md create mode 100644 tutorials/katacoda/case-watch-method-exception-cn/case-watch-method-exception.md create mode 100644 tutorials/katacoda/case-watch-method-exception-cn/finish.md create mode 100644 tutorials/katacoda/case-watch-method-exception-cn/index.json create mode 100644 tutorials/katacoda/case-watch-method-exception-cn/intro.md create mode 100644 tutorials/katacoda/case-watch-method-exception-cn/start-demo.md create mode 100644 tutorials/katacoda/case-watch-method-exception-en/arthas-boot.md create mode 100644 tutorials/katacoda/case-watch-method-exception-en/case-watch-method-exception.md create mode 100644 tutorials/katacoda/case-watch-method-exception-en/finish.md create mode 100644 tutorials/katacoda/case-watch-method-exception-en/index.json create mode 100644 tutorials/katacoda/case-watch-method-exception-en/intro.md create mode 100644 tutorials/katacoda/case-watch-method-exception-en/start-demo.md diff --git a/tutorials/katacoda/case-watch-method-exception-cn/arthas-boot.md b/tutorials/katacoda/case-watch-method-exception-cn/arthas-boot.md new file mode 100644 index 000000000..5c6cb8a17 --- /dev/null +++ b/tutorials/katacoda/case-watch-method-exception-cn/arthas-boot.md @@ -0,0 +1,16 @@ + + + + +在新的`Terminal 2`里，下载`arthas-boot.jar`，再用`java -jar`命令启动： + +`wget https://arthas.aliyun.com/doc/arthas-boot.jar +java -jar arthas-boot.jar`{{execute T2}} + +`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。 + +选择第一个进程，输入 `1`{{execute T2}} ，再`Enter/回车`： + +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。 + +![Arthas Boot](/arthas/scenarios/common-resources/assets/arthas-boot.png) diff --git a/tutorials/katacoda/case-watch-method-exception-cn/case-watch-method-exception.md b/tutorials/katacoda/case-watch-method-exception-cn/case-watch-method-exception.md new file mode 100644 index 000000000..7953c5196 --- /dev/null +++ b/tutorials/katacoda/case-watch-method-exception-cn/case-watch-method-exception.md @@ -0,0 +1,168 @@ + + +### 现象 + +目前，访问 http://localhost/user/0 ，会返回500异常： + +`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"} +``` + +但请求的具体参数，异常栈是什么呢？ + +### 查看UserController的 参数/异常 + +在Arthas里执行： + +`watch com.example.demo.arthas.user.UserController * '{params, throwExp}'`{{execute T2}} + + +1. 第一个参数是类名，支持通配 +2. 第二个参数是函数名，支持通配 + + +访问 `curl http://localhost/user/0`{{execute T3}} ,`watch`命令会打印调用的参数和异常 + +```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], +] +``` + +可以看到实际抛出的异常是`IllegalArgumentException`。 + +可以输入 `Q`{{execute T2}} 或者 `Ctrl+C` 退出watch命令。 + +如果想把获取到的结果展开，可以用`-x`参数： + +`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) + at java.lang.reflect.Method.invoke(Method.java:498) + at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) + at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133) + at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97) + at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) + at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) + at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) + at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967) + at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) + at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) + at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) + at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) + at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) + at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) + at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) + at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) + at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) + at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) + at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) + at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) + at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) + at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) + at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) + at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) + at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) + at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) + at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) + at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) + at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) + at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) + at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) + at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) + at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) + at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) + at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) + at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) + at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) + at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496) + at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) + at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) + at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) + at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) + at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) + at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) + at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790) + at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468) + at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) + at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) + at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) + at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) + at java.lang.Thread.run(Thread.java:748) +, +] +``` + +### 返回值表达式 + +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： + +* loader +* clazz +* method +* target +* params +* returnObj +* throwExp +* isBefore +* isThrow +* isReturn + +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： + +`watch com.example.demo.arthas.user.UserController * '{params[0], target, returnObj}'`{{execute T2}} + + +更多参考： https://arthas.aliyun.com/doc/advice-class.html + + +### 条件表达式 + +`watch`命令支持在第4个参数里写条件表达式，比如： + +`watch com.example.demo.arthas.user.UserController * returnObj 'params[0] > 100'`{{execute T2}} + +当访问 https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/user/1 时，`watch`命令没有输出 + +当访问 https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/user/101 时，`watch`会打印出结果。 + +```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], +] +``` + +### 当异常时捕获 + +`watch`命令支持`-e`选项，表示只捕获抛出异常时的请求： + +`watch com.example.demo.arthas.user.UserController * "{params[0],throwExp}" -e`{{execute T2}} + + +### 按照耗时进行过滤 + +watch命令支持按请求耗时进行过滤，比如： + +`watch com.example.demo.arthas.user.UserController * '{params, returnObj}' '#cost>200'`{{execute T2}} \ No newline at end of file diff --git a/tutorials/katacoda/case-watch-method-exception-cn/finish.md b/tutorials/katacoda/case-watch-method-exception-cn/finish.md new file mode 100644 index 000000000..6355b30cd --- /dev/null +++ b/tutorials/katacoda/case-watch-method-exception-cn/finish.md @@ -0,0 +1,10 @@ + +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。 + +* [Arthas进阶](https://arthas.aliyun.com/doc/arthas-tutorials?language=cn&id=arthas-advanced) +* [Arthas Github](https://github.com/alibaba/arthas) +* [Arthas 文档](https://arthas.aliyun.com/doc/) + +欢迎关注公众号，获取Arthas项目的信息，源码分析，案例实践。 + +![Arthas公众号](/arthas/scenarios/common-resources/assets/qrcode_gongzhonghao.jpg) diff --git a/tutorials/katacoda/case-watch-method-exception-cn/index.json b/tutorials/katacoda/case-watch-method-exception-cn/index.json new file mode 100644 index 000000000..4813ca0cb --- /dev/null +++ b/tutorials/katacoda/case-watch-method-exception-cn/index.json @@ -0,0 +1,45 @@ +{ + "title": "Arthas 排查函数调用异常 案例", + "description": "Arthas 排查函数调用异常 案例", + "difficulty": "高级使用者", + "time": "10分钟", + "details": { + "steps": [ + { + "title": "Start demo", + "text": "start-demo.md" + }, + { + "title": "Start arthas-boot", + "text": "arthas-boot.md" + }, + { + "title": "排查函数调用异常", + "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" + } +} \ No newline at end of file diff --git a/tutorials/katacoda/case-watch-method-exception-cn/intro.md b/tutorials/katacoda/case-watch-method-exception-cn/intro.md new file mode 100644 index 000000000..305296638 --- /dev/null +++ b/tutorials/katacoda/case-watch-method-exception-cn/intro.md @@ -0,0 +1,11 @@ + + + +![Arthas](https://arthas.aliyun.com/doc/_images/arthas.png) + +`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。 + +`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。 + +* Github: https://github.com/alibaba/arthas +* 文档: https://arthas.aliyun.com/doc/ \ No newline at end of file diff --git a/tutorials/katacoda/case-watch-method-exception-cn/start-demo.md b/tutorials/katacoda/case-watch-method-exception-cn/start-demo.md new file mode 100644 index 000000000..59be66ea6 --- /dev/null +++ b/tutorials/katacoda/case-watch-method-exception-cn/start-demo.md @@ -0,0 +1,14 @@ + + + + +下载`demo-arthas-spring-boot.jar`，再用`java -jar`命令启动： + +`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`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) + +启动之后，可以访问80端口： https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com + +![Demo Web](/arthas/scenarios/common-resources/assets/demo-web.png) \ No newline at end of file diff --git a/tutorials/katacoda/case-watch-method-exception-en/arthas-boot.md b/tutorials/katacoda/case-watch-method-exception-en/arthas-boot.md new file mode 100644 index 000000000..5f6d3f246 --- /dev/null +++ b/tutorials/katacoda/case-watch-method-exception-en/arthas-boot.md @@ -0,0 +1,16 @@ + + + + +In the new `Terminal 2`, download `arthas-boot.jar` and start with the `java -jar` command: + +`wget https://arthas.aliyun.com/doc/arthas-boot.jar +java -jar arthas-boot.jar`{{execute T2}} + +`arthas-boot` is the launcher for `Arthas`. It lists all the Java processes, and the user can select the target process to be diagnosed. + +Select the first process, type `1`{{execute T2}} ，then type `Enter`： + +After the Attach is successful, Arthas LOGO is printed. Enter `help`{{execute T2}} for more help. + +![Arthas Boot](/arthas/scenarios/common-resources/assets/arthas-boot.png) diff --git a/tutorials/katacoda/case-watch-method-exception-en/case-watch-method-exception.md b/tutorials/katacoda/case-watch-method-exception-en/case-watch-method-exception.md new file mode 100644 index 000000000..5c2590902 --- /dev/null +++ b/tutorials/katacoda/case-watch-method-exception-en/case-watch-method-exception.md @@ -0,0 +1,116 @@ + + +Currently, visiting http://localhost/user/0 will return a 500 error: + +`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 + +Execute in Arthas: + +`watch com.example.demo.arthas.user.UserController * '{params, throwExp}'`{{execute T2}} + + +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}} \ No newline at end of file diff --git a/tutorials/katacoda/case-watch-method-exception-en/finish.md b/tutorials/katacoda/case-watch-method-exception-en/finish.md new file mode 100644 index 000000000..9711b0aff --- /dev/null +++ b/tutorials/katacoda/case-watch-method-exception-en/finish.md @@ -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) diff --git a/tutorials/katacoda/case-watch-method-exception-en/index.json b/tutorials/katacoda/case-watch-method-exception-en/index.json new file mode 100644 index 000000000..51b1a1946 --- /dev/null +++ b/tutorials/katacoda/case-watch-method-exception-en/index.json @@ -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" + } +} \ No newline at end of file diff --git a/tutorials/katacoda/case-watch-method-exception-en/intro.md b/tutorials/katacoda/case-watch-method-exception-en/intro.md new file mode 100644 index 000000000..c27afd332 --- /dev/null +++ b/tutorials/katacoda/case-watch-method-exception-en/intro.md @@ -0,0 +1,11 @@ + + + +![Arthas](https://arthas.aliyun.com/doc/_images/arthas.png) + +`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 \ No newline at end of file diff --git a/tutorials/katacoda/case-watch-method-exception-en/start-demo.md b/tutorials/katacoda/case-watch-method-exception-en/start-demo.md new file mode 100644 index 000000000..4915b847a --- /dev/null +++ b/tutorials/katacoda/case-watch-method-exception-en/start-demo.md @@ -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 + +![Demo Web](/arthas/scenarios/common-resources/assets/demo-web.png) \ No newline at end of file