我创建了一个自定义的spring-boot入门项目，并希望将其部署到远程Maven存储库。当我运行mvn clean package deploy时，出现错误消息：
[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.1.2.RELEASE:repackage (repackage) on project jcr-service-spring-boot-starter: Execution repackage of goal org.springframework.boot:spring-boot-maven-plugin:2.1.2.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] http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException
实际上，我认为spring-boot入门项目不需要一个主类，因为它永远不会单独运行。
请大家帮我解释一下如何打包项目吗？