How to use IDEA remote connection Debug in springboot

1. First create a Demo ready for remote debugging, pay attention to the configuration of the build project

<?xml  version="1.0" encoding="UTF-8"?>
<project 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></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>
									<resource>META-INF/spring.handlers</resource>
								</transformer>
								<transformer>
									<resource>META-INF/spring.factories</resource>
								</transformer>
								<transformer>
									<resource>META-INF/spring.schemas</resource>
								</transformer>
								<transformer></transformer>
								<transformer>
									<!--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> 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> res = new HashMap();
        res.put("code",0);
        res.put("desc","success");
        res.put("data",data);
        return res.toString();
    }
 
    private String fail(){
        Map<string> res = new HashMap();
        res.put("code",1);
        res.put("desc","fail");
        return res.toString();
    }
 
}</string></string></string>

2. Packaging

Input: mvn clean package, (probably required Wait a few minutes), it is best to specify the local repository before building, so there is no need to re-download the jar package.

3. Configure remote debug in IDEA

Specify socket port = 8081 and specify the port to be debugged Module

4. Start the jar package you just created in the terminal

a. First start debug in IDEA

#b. Then enter the command in the terminal: java -agentlib:jdwp=transport=dt_socket,server=n,address=localhost:8081 -jar remote_test-0.0. 1-SNAPSHOT-all.jar

5. Test

Mark breakpoint on the interface preparing the request

Note: You must start Debug in IDEA first, and then start the project

➜ 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]

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