repackag failed: Unable to find main class

Project scenario ：

In the case of multiple modules , Package sub modules , There will be a situation

Problem description ：

Execution repackage of goal org.springframework.boot:spring-boot-maven-plugin:2.2.1.RELEASE:repackage failed: Unable to find main class

Cause analysis ：

pack , It is for reference of other modules . therefore What comes out of the package is xxx.jar

jar The package must have a main startup class . Just write a main startup class

Solution ：

Bear in mind ： The name of the main startup class cannot be the same , Otherwise, it will be wrong

Related issues ：https://blog.csdn.net/qq_46539281/article/details/122216400