当不希望将SpringBoot打包成独立运行的jar，而只是当做工具jar包时，去掉启动类，打包报错：
Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.1.4.RELEASE:repackage (repackage) on project plat-common: Execution repackage of goal org.springframework.boot:spring-boot-maven-plugin:2.1.4.RELEASE:repackage failed: Unable to find main class -> [Help 1]
原因是SpringBoot使用了自动打包插件，会在打包时找项目下的启动程序
解决办法：
去掉SpringBoot自带的自动打包插件
使用Apache的打包插件
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
