BTrace示例（六）打印异常信息 – 小飞侠

BTrace示例（六）打印异常信息

Post author:xfxia
Post published:2023年7月12日
Post category:其他

被调试程序

模拟异常被吞掉；

@RestController
@RequestMapping("/ch4")
public class Ch4Controller {
    
    @RequestMapping("/exception")
    public String exception() {
        try {
            System.out.println("start...");
            System.out.println(1/0);
            System.out.println("end...");
        }catch(Exception e) {
            //
        }
        return "success";
    }

}

BTrace脚本

捕获到的异常会存储在currentException中；

package com.btrace.example;

import com.sun.btrace.BTraceUtils;
import com.sun.btrace.annotations.BTrace;
import com.sun.btrace.annotations.Kind;
import com.sun.btrace.annotations.Location;
import com.sun.btrace.annotations.OnMethod;
import com.sun.btrace.annotations.Self;
import com.sun.btrace.annotations.TLS;

@BTrace 
public class PrintOnThrow {    
    // store current exception in a thread local
    // variable (@TLS annotation). Note that we can't
    // store it in a global variable!
    @TLS 
    static Throwable currentException;

    // introduce probe into every constructor of java.lang.Throwable
    // class and store "this" in the thread local variable.
    @OnMethod(
        clazz="java.lang.Throwable",
        method="<init>"
    )
    public static void onthrow(@Self Throwable self) {//new Throwable()
        currentException = self;
    }

    @OnMethod(
        clazz="java.lang.Throwable",
        method="<init>"
    )
    public static void onthrow1(@Self Throwable self, String s) {//new Throwable(String msg)
        currentException = self;
    }

    @OnMethod(
        clazz="java.lang.Throwable",
        method="<init>"
    )
    public static void onthrow1(@Self Throwable self, String s, Throwable cause) {//new Throwable(String msg, Throwable cause)
        currentException = self;
    }

    @OnMethod(
        clazz="java.lang.Throwable",
        method="<init>"
    )
    public static void onthrow2(@Self Throwable self, Throwable cause) {//new Throwable(Throwable cause)
        currentException = self;
    }

    // when any constructor of java.lang.Throwable returns
    // print the currentException's stack trace.
    @OnMethod(
        clazz="java.lang.Throwable",
        method="<init>",
        location=@Location(Kind.RETURN)
    )
    public static void onthrowreturn() {
        if (currentException != null) {
            BTraceUtils.Threads.jstack(currentException);
            BTraceUtils.println("=====================");
            currentException = null;
        }
    }

}

执行BTrace脚本

零除异常捕获到了；
还捕获了一个Spring的异常；

>btrace 15368 PrintOnThrow.java
java.lang.ArithmeticException: / by zero
        com.example.demo.btrace.Ch4Controller.exception(Ch4Controller.java:42)
        sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        java.lang.reflect.Method.invoke(Method.java:498)
        org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:189)
        org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
        org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)
        org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)
        org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:800)
        org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
        org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038)
        org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
        org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)
        org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
        org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
        org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92)
        org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)
        org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
        org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200)
        org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
        org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
        org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
        org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
        org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
        org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
        org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
        org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415)
        org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        java.lang.Thread.run(Thread.java:745)
=====================
java.lang.ClassNotFoundException: org.springframework.util.StreamUtils
        java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        java.lang.ClassLoader.loadClass(ClassLoader.java:411)
        sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        org.springframework.http.converter.StringHttpMessageConverter.writeInternal(StringHttpMessageConverter.java:106)
        org.springframework.http.converter.StringHttpMessageConverter.writeInternal(StringHttpMessageConverter.java:43)
        org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:227)
        org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:293)
        org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:180)
        org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:82)
        org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:119)
        org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)
        org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:800)
        org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
        org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038)
        org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
        org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)
        org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
        org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
        org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92)
        org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)
        org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
        org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200)
        org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
        org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
        org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
        org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
        org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
        org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
        org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
        org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415)
        org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        java.lang.Thread.run(Thread.java:745)

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原文链接：https://blog.csdn.net/weixin_33669968/article/details/88889026