错误代码
多模块的SpringBoot项目打包失败，错误代码如下。
[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.3.0.RELEASE:repackage (repackage) on project mmd-service: Execution repackage of goal org.springframework.boot:spring-boot-maven-plugin:2.3.0.RELEASE:repackage failed: Unable to find main class -> [Help 1][ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.[ERROR] Re-run Maven using the -X switch to enable full debug logging.[ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles:[ERROR] [Help 1] /confluence/display/MAVEN/PluginExecutionException[ERROR] [ERROR] After correcting the problems, you can resume the build with the command[ERROR] mvn <goals> -rf :mmd-service
原因
看第一行错误信息就可以知道，出现该问题的原因是模块中引入了spring-boot-maven-plugin，打包的时候它去寻找SpringBoot的启动类，但它没有找到，所以打包失败。
解决
我的解决方法是直接将pom中的spring-boot-maven-plugin相关代码删除。
<plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins>
