springboot分模块问题

springboot 分模块开发时，mvn clean install报错：

Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.5.9.RELEASE:repackage (default) on project core: Execution default of goal o
rg.springframework.boot:spring-boot-maven-plugin:1.5.9.RELEASE:repackage failed: Unable to find main class -> [Help 1]

admin 和 api 都依赖于core.core中有service，dao层。

core中pom.xml去除

<build>
  <plugins>
    <plugin>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-maven-plugin</artifactId>
    </plugin>
  </plugins>
</build>

最外层整个项目的 pom.xml中去除：

<build>
  <plugins>
    <plugin>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-maven-plugin</artifactId>
    </plugin>
  </plugins>
</build>