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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)
|
|
|
|
|
|
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
|
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|
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|
|
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
|
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|
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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)
|
|
|
|
|
|
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
|
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|
|
|
|
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}}
|
