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泉州网站建设手机,如何创建公众号的步骤,空壳网站清理通知,单页设计是什么你是否在项目中会碰到以下一些问题#xff1a; 在代码中打印各种日志来排查#xff0c;比如方法的入参#xff0c;出参#xff0c;及在方法体中打印日志判断走哪行代码还有你觉得代码没问题#xff0c;可是运行出现却是以前的bug#xff0c;感觉代码没修改#xff0c;或…你是否在项目中会碰到以下一些问题 在代码中打印各种日志来排查比如方法的入参出参及在方法体中打印日志判断走哪行代码还有你觉得代码没问题可是运行出现却是以前的bug感觉代码没修改或者别人把你修改好之前的代码部署上去了你想要看线上部署的是不是你修改的最新代码把包从服务器上下载下来然后再反编译查看有些接口请求很慢你想知道这个接口的方法调用链中耗时时间你以前是不是通过切面去打印每个方法的耗时时间修改代码重新部署当进程CPU飙高或者占用内存较大你用top命令查看然后top -H -p x把十进制转成16进制然后jstack  x | grep -A 10 y命令排查会觉得有点麻烦当本地程序运行正常线上代码运行不正常你可能需要优化一个class几行代码在线上看是否会运行正常重新打包部署会觉得有点麻烦 其实阿里的线上排查工具arthas就可以解决上述问题 下载地址https://alibaba.github.io/arthas/arthas-boot.jar 直接执行命令 java -jar arthas-boot.jar 如果出现中文乱码需要添加参数 -Dfile.encodingUTF-8  java -Dfile.encodingUTF-8 -jar arthas-boot.jar 直接输入你要连接的进程号如 4 进入arthas交互界面 现在根据以下代码来进行测试 package com.htf.smm.controller;import com.htf.smm.service.SmmIndexSyncService; import com.htf.smm.service.impl.TestServiceOne; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.repository.query.Param; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController;import java.util.Objects;RestController RequestMapping(/smm) public class SmmController {Autowiredprivate TestServiceOne testServiceOne;RequestMapping(/ycTest)public void ycTest(Long time) {System.out.println(执行开始time);Other other new Other();other.setInfo(其他);Coordinate coordinate new Coordinate();coordinate.setX(1);coordinate.setY(2);coordinate.setOther(other);Address address new Address();address.setAddr(昌北);address.setCoordinate(coordinate);School school new School();school.setName(华东交大);school.setAddress(address);ParamEntiry paramEntiry new ParamEntiry();paramEntiry.setName(yc);paramEntiry.setAge(32);paramEntiry.setSchool(school);test(paramEntiry);System.out.println(执行完毕);}public ReturnEntity test(ParamEntiry paramEntiry){ReturnEntity returnEntity new ReturnEntity();Other other new Other();other.setInfo(其他);Coordinate coordinate new Coordinate();coordinate.setX(1);coordinate.setY(2);coordinate.setOther(other);Address address new Address();address.setAddr(昌北);address.setCoordinate(coordinate);School school new School();school.setName(华东交大);school.setAddress(address);returnEntity.setSchool(school);return returnEntity;} }package com.htf.smm.controller;import lombok.Data;Data public class ParamEntiry {private String name;private Integer age;private School school; } Data class School{private String name;private Address address; } Data class Address{private String addr;private Coordinate coordinate; } Data class Coordinate{private int x;private int y;private Other other; } Data class Other{private String info; }Data public class ReturnEntity {private String name;private Integer age;private School school; } package com.htf.smm.service.impl;import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service;Service public class TestServiceOne {private String serviceName one;Autowiredprivate TestServiceTwo testServiceTwo; }package com.htf.smm.service.impl;import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service;Service public class TestServiceTwo {private String serviceName two;Autowiredprivate TestServiceThree testServiceThree; }package com.htf.smm.service.impl;import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service;Service public class TestServiceThree {private String serviceName three;Autowiredprivate TestServiceFour testServiceFour; }package com.htf.smm.service.impl;import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service;Service public class TestServiceFour {private String serviceName four;Autowiredprivate TestServiceFive testServiceFive; }下面来介绍常用的几个命令watchtracestack jadredefine thrad  watch命令 参数名称参数说明class-pattern类名表达式匹配method-pattern函数名表达式匹配express观察表达式默认值{params, target, returnObj}condition-express条件表达式[b]在函数调用之前观察[e]在函数异常之后观察[s]在函数返回之后观察[f]在函数结束之后(正常返回和异常返回)观察[E]开启正则表达式匹配默认为通配符匹配[x:]指定输出结果的属性遍历深度默认为 1最大值是 4 [arthas9388]\( watch com.htf.smm.controller.SmmController test Press Q or CtrlC to abort. Affect(class count: 1 , method count: 1) cost in 27 ms, listenerId: 5 methodcom.htf.smm.controller.SmmController.test locationAtExit ts2023-03-01 15:11:33; [cost0.0424ms] resultArrayList[Object[][isEmptyfalse;size1],SmmController[com.htf.smm.controller.SmmController59fe5960],ReturnEntity[ReturnEntity(namenull, agenull, schoolSchool(name华东交大, addressAddress(addr昌北, coordinateCoordinate(x1, y2, otherOther(info其他)))))], ] 默认返回paramstargetreturnObj{params, target, returnObj}深度为1-x 1且在函数结束之后(正常返回和异常返回)-f观察即等于下面这个命令 [arthas9388]\) watch com.htf.smm.controller.SmmController test {params, target, returnObj} -x 1 -f Press Q or CtrlC to abort. Affect(class count: 1 , method count: 1) cost in 28 ms, listenerId: 7 methodcom.htf.smm.controller.SmmController.test locationAtExit ts2023-03-01 15:44:01; [cost0.0398ms] resultArrayList[Object[][isEmptyfalse;size1],SmmController[com.htf.smm.controller.SmmController59fe5960],ReturnEntity[ReturnEntity(namenull, agenull, schoolSchool(name华东交大, addressAddress(addr昌北, coordinateCoordinate(x1, y2, otherOther(info其他)))))], ] Object[][isEmptyfalse;size1] 为params为什么是个数组呢因为参数可能有多个 SmmController[com.htf.smm.controller.SmmController59fe5960] 为当前对象 ReturnEntity[ReturnEntity(namenull, agenull, schoolSchool(name华东交大, addressAddress(addr昌北, coordinateCoordinate(x1, y2, otherOther(info其他)))))] 为returnObj locationAtExit 为在函数结束之后正常返回观察 重要参数-x默认为1但是当参数和当前对象的属性有对象引用的时候我们就需要用到-x如上命令执行 SmmController[com.htf.smm.controller.SmmController59fe5960] 我们无法查看到当前对象内部有什么属性Object[][isEmptyfalse;size1]当前参数的具体值 我们设置-x 2试试 [arthas9388]\( watch com.htf.smm.controller.SmmController test {params, target, returnObj} -x 2 -f Press Q or CtrlC to abort. Affect(class count: 1 , method count: 1) cost in 29 ms, listenerId: 14 methodcom.htf.smm.controller.SmmController.test locationAtExit ts2023-03-01 16:01:39; [cost0.0249ms] resultArrayList[Object[][ParamEntiry[ParamEntiry(nameyc, age32, schoolSchool(name华东交大, addressAddress(addr昌北, coordinateCoordinate(x1, y2, otherOther(info其他)))))],],SmmController[testServiceOneTestServiceOne[com.htf.smm.service.impl.TestServiceOne55111d28],],ReturnEntity[namenull,agenull,schoolSchool[School(name华东交大, addressAddress(addr昌北, coordinateCoordinate(x1, y2, otherOther(info其他))))],], ] 上述所示就把参数1对应的对象展示出来了把当前对象中的对象引用展示出来了把返回对象的引用给展示出来了 注意-x的最大值为4 重要参数-n默认是无限次当线上执行这个接口比较频繁我们用运维工具可能会频繁去监听打印这个方法相关的信息很耗服务器资源而且影响接口响应耗时的时间当我们为了排查问题只要获取到一次监听的时候就可以加-n参数-n 1表示只执行两次,执行1次后就会自动退出监听 [arthas9388]\) watch com.htf.smm.controller.SmmController test {params, target, returnObj} -x 2 -f -n 1 Press Q or CtrlC to abort. Affect(class count: 1 , method count: 1) cost in 30 ms, listenerId: 15 methodcom.htf.smm.controller.SmmController.test locationAtExit ts2023-03-01 16:12:51; [cost0.0357ms] resultArrayList[Object[][ParamEntiry[ParamEntiry(nameyc, age32, schoolSchool(name华东交大, addressAddress(addr昌北, coordinateCoordinate(x1, y2, otherOther(info其他)))))],],SmmController[testServiceOneTestServiceOne[com.htf.smm.service.impl.TestServiceOne55111d28],],ReturnEntity[namenull,agenull,schoolSchool[School(name华东交大, addressAddress(addr昌北, coordinateCoordinate(x1, y2, otherOther(info其他))))],], ] Command execution times exceed limit: 1, so command will exit. You can set it with -n option. 最后一行Command execution times exceed limit: 1, so command will exit. You can set it with -n option.表示执行次数限制为1次可以通过-n来设置执行的次数 trace命令 参数名称参数说明class-pattern类名表达式匹配method-pattern方法名表达式匹配condition-express条件表达式[E]开启正则表达式匹配默认为通配符匹配[n:]命令执行次数#cost方法执行耗时 根据耗时#cost0大小匹配如下耗时是以s为单位的  [arthas9388]\( trace com.htf.smm.controller.SmmController ycTest #cost0 Press Q or CtrlC to abort. Affect(class count: 1 , method count: 1) cost in 36 ms, listenerId: 27 ---ts2023-03-02 09:54:37;thread_namehttp-nio-8080-exec-2;id4f;is_daemontrue;priority5;TCCLorg.springframework.boot.web.embedded.tomcat.TomcatEmbeddedWebappClassLoader1aa6e3c0---[0.3154ms] com.htf.smm.controller.SmmController:ycTest()---[3.01% 0.0095ms ] com.htf.smm.controller.Other:init() #31---[1.49% 0.0047ms ] com.htf.smm.controller.Other:setInfo() #32---[1.81% 0.0057ms ] com.htf.smm.controller.Coordinate:init() #33---[1.55% 0.0049ms ] com.htf.smm.controller.Coordinate:setX() #34---[1.20% 0.0038ms ] com.htf.smm.controller.Coordinate:setY() #35---[1.30% 0.0041ms ] com.htf.smm.controller.Coordinate:setOther() #36---[1.30% 0.0041ms ] com.htf.smm.controller.Address:init() #37---[1.17% 0.0037ms ] com.htf.smm.controller.Address:setAddr() #38---[1.24% 0.0039ms ] com.htf.smm.controller.Address:setCoordinate() #39---[1.17% 0.0037ms ] com.htf.smm.controller.School:init() #40---[1.33% 0.0042ms ] com.htf.smm.controller.School:setName() #41---[1.33% 0.0042ms ] com.htf.smm.controller.School:setAddress() #42---[1.24% 0.0039ms ] com.htf.smm.controller.ParamEntiry:init() #43---[1.14% 0.0036ms ] com.htf.smm.controller.ParamEntiry:setName() #44---[1.43% 0.0045ms ] com.htf.smm.controller.ParamEntiry:setAge() #45---[1.24% 0.0039ms ] com.htf.smm.controller.ParamEntiry:setSchool() #46---[3.01% 0.0095ms ] com.htf.smm.controller.SmmController:test() #47 stack命令 参数名称参数说明class-pattern类名表达式匹配method-pattern方法名表达式匹配condition-express条件表达式[E]开启正则表达式匹配默认为通配符匹配[n:]执行次数限制stackwatchtrace命令用法一致 根据参数值params[0].nameyc匹配用法如下 [arthas9388]\) stack com.htf.smm.controller.SmmController test params[0].nameyc Press Q or CtrlC to abort. Affect(class count: 1 , method count: 1) cost in 28 ms, listenerId: 37 ts2023-03-02 10:16:57;thread_namehttp-nio-8080-exec-4;id51;is_daemontrue;priority5;TCCLorg.springframework.boot.web.embedded.tomcat.TomcatEmbeddedWebappClassLoader1aa6e3c0com.htf.smm.controller.SmmController.test()at com.htf.smm.controller.SmmController.ycTest(SmmController.java:47)at sun.reflect.GeneratedMethodAccessor55.invoke(null:-1)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:483)at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)at javax.servlet.http.HttpServlet.service(HttpServlet.java:626)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)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:53)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:201)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)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:202)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)at org.apache.coyote.AbstractProtocol\(ConnectionHandler.process(AbstractProtocol.java:868)at org.apache.tomcat.util.net.NioEndpoint\)SocketProcessor.doRun(NioEndpoint.java:1589)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)at java.util.concurrent.ThreadPoolExecutor\(Worker.run(ThreadPoolExecutor.java:617)at org.apache.tomcat.util.threads.TaskThread\)WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:744) 注意stack命令和trace命令参数值匹配和耗时大小匹配可以联合使用如下 [arthas9388]\( stack com.htf.smm.controller.SmmController test params[0].nameyc #cost0 Press Q or CtrlC to abort. Affect(class count: 1 , method count: 1) cost in 38 ms, listenerId: 38 ts2023-03-02 10:23:37;thread_namehttp-nio-8080-exec-6;id53;is_daemontrue;priority5;TCCLorg.springframework.boot.web.embedded.tomcat.TomcatEmbeddedWebappClassLoader1aa6e3c0com.htf.smm.controller.SmmController.test()at com.htf.smm.controller.SmmController.ycTest(SmmController.java:47)at sun.reflect.GeneratedMethodAccessor55.invoke(null:-1)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:483)at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)at javax.servlet.http.HttpServlet.service(HttpServlet.java:626)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)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:53)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:201)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)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:202)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)at org.apache.coyote.AbstractProtocol\)ConnectionHandler.process(AbstractProtocol.java:868)at org.apache.tomcat.util.net.NioEndpoint\(SocketProcessor.doRun(NioEndpoint.java:1589)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)at java.util.concurrent.ThreadPoolExecutor\)Worker.run(ThreadPoolExecutor.java:617)at org.apache.tomcat.util.threads.TaskThread\(WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:744) jad命令 lass-pattern类名表达式匹配[c:]类所属 ClassLoader 的 hashcode[classLoaderClass:]指定执行表达式的 ClassLoader 的 class name[E]开启正则表达式匹配默认为通配符匹配 反编译类jad 类路径 [arthas9388]\) jad com.htf.smm.controller.SmmControllerClassLoader: -sun.misc.Launcher\(AppClassLoader58644d46-sun.misc.Launcher\)ExtClassLoader71c7db30Location: /E:/code/htf/htf-parent/htf-damp-parent/htf-damp-smm/target/classes//** Decompiled with CFR.** Could not load the following classes:* com.htf.smm.controller.Address* com.htf.smm.controller.Coordinate* com.htf.smm.controller.Other* com.htf.smm.controller.ParamEntiry* com.htf.smm.controller.ReturnEntity* com.htf.smm.controller.School* com.htf.smm.service.impl.TestServiceOne*/package com.htf.smm.controller;import com.htf.smm.controller.Address;import com.htf.smm.controller.Coordinate;import com.htf.smm.controller.Other;import com.htf.smm.controller.ParamEntiry;import com.htf.smm.controller.ReturnEntity;import com.htf.smm.controller.School;import com.htf.smm.service.impl.TestServiceOne;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;RestControllerRequestMapping(value{/smm})public class SmmController {Autowiredprivate TestServiceOne testServiceOne;public ReturnEntity test(ParamEntiry paramEntiry) {ReturnEntity returnEntity new ReturnEntity();Other other new Other(); /54/ other.setInfo(其他);Coordinate coordinate new Coordinate(); /56/ coordinate.setX(1); /57/ coordinate.setY(2); /58/ coordinate.setOther(other);Address address new Address(); /60/ address.setAddr(昌北); /61/ address.setCoordinate(coordinate);School school new School(); /63/ school.setName(华东交大); /64/ school.setAddress(address); /65/ returnEntity.setSchool(school); /66/ return returnEntity;}RequestMapping(value{/ycTest})public void ycTest(Long time) throws InterruptedException { /30/ System.out.println(执行开始 time);Other other new Other(); /32/ other.setInfo(其他);Coordinate coordinate new Coordinate(); /34/ coordinate.setX(1); /35/ coordinate.setY(2); /36/ coordinate.setOther(other);Address address new Address(); /38/ address.setAddr(昌北); /39/ address.setCoordinate(coordinate);School school new School(); /41/ school.setName(华东交大); /42/ school.setAddress(address);ParamEntiry paramEntiry new ParamEntiry(); /44/ paramEntiry.setName(yc); /45/ paramEntiry.setAge(Integer.valueOf(32)); /46/ paramEntiry.setSchool(school); /47/ this.test(paramEntiry); /48/ System.out.println(执行完毕);}}Affect(row-cnt:1) cost in 357 ms. 其中有ClassLoader和Location信息如果把他去掉加 –source-only 参数如下所示 [arthas9388]\( jad com.htf.smm.controller.SmmController --source-only/** Decompiled with CFR.** Could not load the following classes:* com.htf.smm.controller.Address* com.htf.smm.controller.Coordinate* com.htf.smm.controller.Other* com.htf.smm.controller.ParamEntiry* com.htf.smm.controller.ReturnEntity* com.htf.smm.controller.School* com.htf.smm.service.impl.TestServiceOne*/package com.htf.smm.controller;import com.htf.smm.controller.Address;import com.htf.smm.controller.Coordinate;import com.htf.smm.controller.Other;import com.htf.smm.controller.ParamEntiry;import com.htf.smm.controller.ReturnEntity;import com.htf.smm.controller.School;import com.htf.smm.service.impl.TestServiceOne;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;RestControllerRequestMapping(value{/smm})public class SmmController {Autowiredprivate TestServiceOne testServiceOne;public ReturnEntity test(ParamEntiry paramEntiry) {ReturnEntity returnEntity new ReturnEntity();Other other new Other(); /*54*/ other.setInfo(其他);Coordinate coordinate new Coordinate(); /*56*/ coordinate.setX(1); /*57*/ coordinate.setY(2); /*58*/ coordinate.setOther(other);Address address new Address(); /*60*/ address.setAddr(昌北); /*61*/ address.setCoordinate(coordinate);School school new School(); /*63*/ school.setName(华东交大); /*64*/ school.setAddress(address); /*65*/ returnEntity.setSchool(school); /*66*/ return returnEntity;}RequestMapping(value{/ycTest})public void ycTest(Long time) throws InterruptedException { /*30*/ System.out.println(执行开始 time);Other other new Other(); /*32*/ other.setInfo(其他);Coordinate coordinate new Coordinate(); /*34*/ coordinate.setX(1); /*35*/ coordinate.setY(2); /*36*/ coordinate.setOther(other);Address address new Address(); /*38*/ address.setAddr(昌北); /*39*/ address.setCoordinate(coordinate);School school new School(); /*41*/ school.setName(华东交大); /*42*/ school.setAddress(address);ParamEntiry paramEntiry new ParamEntiry(); /*44*/ paramEntiry.setName(yc); /*45*/ paramEntiry.setAge(Integer.valueOf(32)); /*46*/ paramEntiry.setSchool(school); /*47*/ this.test(paramEntiry); /*48*/ System.out.println(执行完毕);}} 如果不展示行号加--lineNumber false 参数 [arthas9388]\) jad com.htf.smm.controller.SmmController –source-only –lineNumber false /** Decompiled with CFR.** Could not load the following classes:* com.htf.smm.controller.Address* com.htf.smm.controller.Coordinate* com.htf.smm.controller.Other* com.htf.smm.controller.ParamEntiry* com.htf.smm.controller.ReturnEntity* com.htf.smm.controller.School* com.htf.smm.service.impl.TestServiceOne*/ package com.htf.smm.controller;import com.htf.smm.controller.Address; import com.htf.smm.controller.Coordinate; import com.htf.smm.controller.Other; import com.htf.smm.controller.ParamEntiry; import com.htf.smm.controller.ReturnEntity; import com.htf.smm.controller.School; import com.htf.smm.service.impl.TestServiceOne; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController;RestController RequestMapping(value{/smm}) public class SmmController {Autowiredprivate TestServiceOne testServiceOne;public ReturnEntity test(ParamEntiry paramEntiry) {ReturnEntity returnEntity new ReturnEntity();Other other new Other();other.setInfo(其他);Coordinate coordinate new Coordinate();coordinate.setX(1);coordinate.setY(2);coordinate.setOther(other);Address address new Address();address.setAddr(昌北);address.setCoordinate(coordinate);School school new School();school.setName(华东交大);school.setAddress(address);returnEntity.setSchool(school);return returnEntity;}RequestMapping(value{/ycTest})public void ycTest(Long time) throws InterruptedException {System.out.println(执行开始 time);Other other new Other();other.setInfo(其他);Coordinate coordinate new Coordinate();coordinate.setX(1);coordinate.setY(2);coordinate.setOther(other);Address address new Address();address.setAddr(昌北);address.setCoordinate(coordinate);School school new School();school.setName(华东交大);school.setAddress(address);ParamEntiry paramEntiry new ParamEntiry();paramEntiry.setName(yc);paramEntiry.setAge(Integer.valueOf(32));paramEntiry.setSchool(school);this.test(paramEntiry);System.out.println(执行完毕);} } 反编译类中的方法如下 [arthas9388]\( jad com.htf.smm.controller.SmmController test --source-only --lineNumber false public ReturnEntity test(ParamEntiry paramEntiry) {ReturnEntity returnEntity new ReturnEntity();Other other new Other();other.setInfo(其他);Coordinate coordinate new Coordinate();coordinate.setX(1);coordinate.setY(2);coordinate.setOther(other);Address address new Address();address.setAddr(昌北);address.setCoordinate(coordinate);School school new School();school.setName(华东交大);school.setAddress(address);returnEntity.setSchool(school);return returnEntity; } retransform命令结合 jad/mc 命令使用 1、jad 命令反编译然后可以用其它编译器  [arthas9388]\) jad com.htf.smm.controller.SmmController –source-only –lineNumber false D:\\tmp\\SmmController.java 2、修改源码 修改了日志输出 3、mc 命令来内存编译修改过的代码 [arthas9388]\( mc D:\\\tmp\\\SmmController.java -d D:\\\tmp Memory compiler output: D:\tmp\com\htf\smm\controller\SmmController.class Affect(row-cnt:1) cost in 1792 ms. 4、用 retransform 命令加载新的字节码  [arthas9388]\) retransform D:\\tmp\\com\\htf\\smm\\controller\\SmmController.class retransform success, size: 1, classes: com.htf.smm.controller.SmmController 之后调用的时候日志输出是修改了执行完毕之前是执行完毕 thread命令 参数名称参数说明id线程 id[n:]指定最忙的前 N 个线程并打印堆栈[b]找出当前阻塞其他线程的线程[i value]指定 cpu 使用率统计的采样间隔单位为毫秒默认值为 200[–all]显示所有匹配的线程 我们用它来排查cpu占比很高的问题  得知占比cpu最高的线程的id是81执行命令thread 81如下 [arthas16256]\( thread 81 http-nio-8080-exec-1 Id81 RUNNABLEat java.io.FileOutputStream.writeBytes(Native Method)at java.io.FileOutputStream.write(FileOutputStream.java:307)at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)at java.io.PrintStream.write(PrintStream.java:482)at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:221)at sun.nio.cs.StreamEncoder.implFlushBuffer(StreamEncoder.java:291)at sun.nio.cs.StreamEncoder.flushBuffer(StreamEncoder.java:104)at java.io.OutputStreamWriter.flushBuffer(OutputStreamWriter.java:185)at java.io.PrintStream.newLine(PrintStream.java:546)at java.io.PrintStream.println(PrintStream.java:807)at com.htf.smm.controller.SmmController.test(SmmController.java:66)at com.htf.smm.controller.SmmController.ycTest(SmmController.java:46)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:483)at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)at javax.servlet.http.HttpServlet.service(HttpServlet.java:626)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)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:53)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:201)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)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:202)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)at org.apache.coyote.AbstractProtocol\)ConnectionHandler.process(AbstractProtocol.java:868)at org.apache.tomcat.util.net.NioEndpoint\(SocketProcessor.doRun(NioEndpoint.java:1589)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)at java.util.concurrent.ThreadPoolExecutor\)Worker.run(ThreadPoolExecutor.java:617)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:744) 得知在业务代码 at com.htf.smm.controller.SmmController.test(SmmController.java:66)     at com.htf.smm.controller.SmmController.ycTest(SmmController.java:46)中有问题 参考 monitor——方法执行监控 watch——方法执行数据观测查看方法的入参出参和当前对象的属性 trace——方法内部调用路径并输出方法路径上的每个节点上耗时 stack——输出当前方法之前到当前方法被调用的调用路径 tt——方法执行数据的时空隧道记录下指定方法每次调用的入参和返回信息并能对这些不同的时间下调用进行观测 jad反编译 redefine   /xx/xx.class  更新class文件 服务重启就是失效了 dashboard看板thread命令可以排查cpu和内存飙高问题