springboot使用IDEA远程Debug

项目上线之后，如果日志打印的很模糊或者业务逻辑比较复杂，有时候无法定位具体的错误原因，因此可以通过IDEA远程代理进行Debug。

线上的代码一定要和本地的一致！

环境：

• 2.1.4.RELEASE（org.springframework.boot）

• jdk1.8

• Apache Maven 3.5.0

 1、先创建一个准备远程调试的Demo，注意构建项目的配置

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.remote.test</groupId>
<artifactId>remote_test</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>remote_test</name>
<description>Demo project for Spring Boot</description>

<properties>
<java.version>1.8</java.version>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>RELEASE</version>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.2</version>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.1.4.RELEASE</version>
</dependency>
</dependencies>
<configuration>
<keepDependenciesWithProvidedScope>true</keepDependenciesWithProvidedScope>
<createDependencyReducedPom>false</createDependencyReducedPom>
<filters>
<filter>
<artifact>*:*</artifact>
<excludes>
<exclude>META-INF/*.SF</exclude>
<exclude>META-INF/*.DSA</exclude>
<exclude>META-INF/*.RSA</exclude>
</excludes>
</filter>
</filters>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<finalName>${project.artifactId}-${project.version}-all</finalName>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>META-INF/spring.handlers</resource>
</transformer>
<transformer implementation="org.springframework.boot.maven.PropertiesMergingResourceTransformer">
<resource>META-INF/spring.factories</resource>
</transformer>
<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>META-INF/spring.schemas</resource>
</transformer>
<transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<!--根据项目的全名指定启动类-->
                                   <mainClass>com.remote.test.remote_test.RemoteTestApplication</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

package com.remote.test.remote_test;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.Map;

@RestController
@RequestMapping("remote/test")
public class UserController {

private static final Logger logger = LoggerFactory.getLogger(UserController.class);

@PostMapping("selectByUserId")
   public String selectUserInfo(@RequestParam("userId") String userId) {
       try {
           Map<String,Object> userInfo = new HashMap<>();
           userInfo.put("userId",userId);
           userInfo.put("age",23);
           userInfo.put("name","yanshao");
           userInfo.put("address","shanghai");
           logger.info("Query user information by user ID. userInfo: {}",userInfo.toString());
           return this.success(userInfo);
       } catch (Exception e) {
           logger.error("Query user information by user ID. userId:{} ", userId, e);
           return this.fail();
       }
   }

private String success(Object data){
       Map<String,Object> res = new HashMap<>();
       res.put("code",0);
       res.put("desc","success");
       res.put("data",data);
       return res.toString();
   }

private String fail(){
       Map<String,Object> res = new HashMap<>();
       res.put("code",1);
       res.put("desc","fail");
       return res.toString();
   }

}

2、打包

输入：mvn clean package，（大概需要等几分钟），最好在构建之前指定本地repository，就不需要重新下载jar包了。

3、在IDEA配置远程Debug

指定socket port = 8081，指定准备debug的模块

4、在终端启动刚才打好的jar包

a. 先在IDEA启动debug

b. 然后在终端输入命令：java -agentlib:jdwp=transport=dt_socket,server=n,address=localhost:8081 -jar remote_test-0.0.1-SNAPSHOT-all.jar

5、测试

在准备请求的接口上标记断点

注意：必须先在IDEA启动Debug，然后再启动项目

➜ Desktop java -agentlib:jdwp=transport=dt_socket,server=n,address=localhost:8081 -jar remote_test-0.0.1-SNAPSHOT-all.jar

ERROR: transport error 202: connect failed: Connection refused
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [debugInit.c:750]

来源：https://blog.csdn.net/qq_31289187/article/details/112667136