Build Failure on Maven 2.2.1
----------------------------

                 Key: TOMAHAWK-1483
                 URL: https://issues.apache.org/jira/browse/TOMAHAWK-1483
             Project: MyFaces Tomahawk
          Issue Type: Bug
          Components: Build Process (Assembly)
    Affects Versions: 1.1.10-SNAPSHOT
         Environment: Windows 7, Maven 2.2.1
            Reporter: Michael Kurz
         Attachments: TOMAHAWK-1483.patch

We had some strange troubles over here building the Tomahawk trunk. The build 
succeeded on one machine and failed on another. After some investigations we 
found out that it is working with Maven 2.0.10 and not working with Maven 2.2.1 
(generated source folders are not used in core12 and core20).

The problem seems to be, that the build-helper-maven-plugin is defined twice in 
core12 and core20. The first time it adds the following directories in phase 
generate-sources:

${project.build.directory}/shared_sources
${project.build.directory}/tomahawk12_sources

The second time it adds the following directories in phase process-sources:

${project.build.directory}/shared_sources

The funny thing is, with Maven 2.2.1 the first plugin execution in phase 
generate-sources never seems to be called. When I remove the second one it 
works as expected.

Anyway, do we need the second execution of the plugin in phase process-sources? 
I don't see a reason.

Thanks to Ingo Hofmann for pointing me to this issue.

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