how to control the pom.xml inside jar built by maven?

I had a similar requirement, as I wanted to get all the information that belongs to the parent pom.xml. In others words, I wanted to have, in addition to the "raw" pom.xml, the effective pom inside the JAR generated.

The idea is to use the help:effective-pom plugin and goal during the generation of the JAR, and put it with the pom.xml. This is done with this configuration:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-help-plugin</artifactId>
    <version>2.1.1</version>
    <executions>
        <execution>
            <phase>generate-resources</phase>
            <goals>
                <goal>effective-pom</goal>
            </goals>
            <configuration>
                <output>${project.build.outputDirectory}/META-INF/maven/${project.groupId}/${project.artifactId}/effective-pom.xml</output>
            </configuration>
        </execution>
    </executions>
</plugin>

(source)