understanding Spring Boot Maven Plugin in Multi-Module projects

Question

I'm learning about Spring Boot multi module projects and I try to understand what exactly does spring boot maven plugin.

For example I have 2 different projects. In the first project I have the spring boot maven plugin in the web module:

<build>
  <plugins>
    <plugin>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-maven-plugin</artifactId>
      <version>2.0.4.RELEASE</version>
      <configuration>
        <mainClass>dgs.web.DemoApplication</mainClass>
        <layout>ZIP</layout>
      </configuration>
      <executions>
        <execution>
          <goals>
            <goal>repackage</goal>
          </goals>
        </execution>
      </executions>
    </plugin>
  </plugins>
</build>

And in the second project I have this plugin in the data module:

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
         <executions>
             <execution>
                 <goals>
                     <goal>repackage</goal>
                 </goals>
                 <configuration>
                     <skip>true</skip>
                 </configuration>
             </execution>
         </executions>
        </plugin>
    </plugins>
</build>

And this is in the parent pom of the 2nd project:

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

Can somebody explain me what exaclty does this spring boot maven plugin especially in the second project? And why there is no reference about mainClass. I see this mainClass tag only in the first project.

For exact code examples, one should give also parent decralation, as usually Spring Boot parent is used, that defines a lot of defaults for spring-boot-maven-plugin. Again see docs given. — Paul Verest
– Paul Verest, Commented Mar 24, 2021 at 2:38

Simon Martinelli · Accepted Answer · 2018-08-24 11:40:14Z

0

The maven plugin is for packaging and executing via Maven.

You should read the docs:

https://docs.spring.io/spring-boot/docs/current/reference/html/build-tool-plugins-maven-plugin.html

https://docs.spring.io/spring-boot/docs/2.0.4.RELEASE/maven-plugin/

answered Aug 24, 2018 at 11:40

Simon Martinelli

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