unable to generate maven plugin.xml descriptor

Question

EDIT : Solved was missing the tag <packaging>maven-plugin</packaging> in my project pom. I misunderstood the sentence in this post, didn't know the meaning of leaving out ... :

thanks man, i figured it out already i left out <packaging>maven-plugin</packaging> in the pom file hope this helps others

---

I'm trying to build a maven plugin however I can't get the plugin.xml file to be generated.

I've tried command line and pom configuration for maven-plugin-plugin, with/without descriptor goal and phase. I guess I'm doing it right there.

Probably it is the rest that is not done correctly. The only related topics that I found is why is my maven plugin descriptor not being generated automatically? and it doesn't help much.

Here is the maven log http://pastebin.com/uA2KFTXN

I have two mojos with Java4 anotations (@goal and @phase). I have the following tags in my Pom

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-plugin-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <goalPrefix>signature</goalPrefix>
            </configuration>
            <executions>
                <execution>
                    <goals>
                        <goal>descriptor</goal>
                    </goals>
                    <phase>process-classes</phase>
                </execution>
            </executions>
        </plugin>