目录1、先创建一个准备远程调试的Demo，注意构建项目的配置2、打包3、在IDEA配置远程Debug4、在终端启动刚才打好的jar包5、测试
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.jarERROR: transport error 202: connect failed: Connection refusedERROR: 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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也就越容易失败，还不如怀揣一颗平常心，
