Maven archetype overwrites parent information
---------------------------------------------

                 Key: MNG-3225
                 URL: http://jira.codehaus.org/browse/MNG-3225
             Project: Maven 2
          Issue Type: Bug
          Components: Plugin Creation Tools
    Affects Versions: 2.0.7
            Reporter: Peter Liljenberg
            Priority: Critical


When creating a new archetype that I want to use for my projects I ran into 
some trouble with the created/copied pom.xml.

The archetype pom.xml (\src\main\resources\archetype-resources\pom.xml) looks 
like this:

 <project>
  <parent>
                <groupId>group</groupId>
                <artifactId>masterpom</artifactId>
                <version>1.0</version>
  </parent>
  <modelVersion>4.0.0</modelVersion>
  <groupId>group</groupId>
  <artifactId>${artifactId}</artifactId>
  <version>1.0</version>
</project>

When I run my archetype it creates a pom.xml that looks like:

<project>
  <parent>
  <artifactId>integration</artifactId>
    <groupId>group</groupId>
    <version>1.0</version>
  </parent>
  <modelVersion>4.0.0</modelVersion>
  <groupId>group</groupId>
  <artifactId>test</artifactId>
  <version>1.0</version>
</project>

Where "integration" is the name of the pom in the folder that I'm running mvn 
archetype:create from.
Digging into the source we find in DefaultArchetype.java that processTemplate 
is indeed reading the parent pom and overwriting whatever was found in the 
original pom.xml.
Is this really what we want to achieve? It should be possible to keep the 
parent-pom from the pom.xml in the archetype since it reduces the need for all 
developers to change their newly created pom.xml.

<code>
processTemplates
 if ( parentModel != null )
        {
            Parent parent = new Parent();
            parent.setGroupId( parentModel.getGroupId() );
            if ( parent.getGroupId() == null )
            {
                parent.setGroupId( parentModel.getParent().getGroupId() );
            }
            parent.setArtifactId( parentModel.getArtifactId() );
            parent.setVersion( parentModel.getVersion() );
            if ( parent.getVersion() == null )
            {
                parent.setVersion( parentModel.getParent().getVersion() );
            }
            generatedModel.setParent( parent );
</code>

Two alternative solutions:
 * If the parent-pom is specified in the archetype-pom, don't replace it
 * A parameter that we can supply that will leave the archetype-pom parent 
setting untouched.

I vote for solution number 1....

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