NPE in groupID-less POMs
------------------------

         Key: MNG-1527
         URL: http://jira.codehaus.org/browse/MNG-1527
     Project: Maven 2
        Type: Bug
  Components: maven-artifact  
    Versions: 2.0    
 Environment: JDK 1.5.0_05, Kubunto Linux 5.1
    Reporter: Arik Kfir


I have a parent POM which defines a group ID and is parsed+deployed OK.

I also have a child POM which extends the parent POM. When running the 
following on the child POM, I get:

[EMAIL PROTECTED]:~/projects/corleon-site/trunk$ mvn release:prepare 
-Dusername=arikkfir
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'release'.
[INFO] 
----------------------------------------------------------------------------
[INFO] Building Corleon
[INFO]    task-segment: [release:prepare] (aggregator-style)
[INFO] 
----------------------------------------------------------------------------
[INFO] [release:prepare]
[INFO] What tag name should be used?
RELEASE-1.0
[INFO] Verifying there are no local modifications ...
[INFO] Checking lineage for snapshots ...
[INFO] Checking dependencies for snapshots ...
[INFO] Checking plugins for snapshots ...
[INFO] What is the release version for 'org.corleon:corleon'? [1.0]

[INFO] Checking in modified POMs
[INFO] Tagging release with the label RELEASE-1.0.
[INFO] What is the new development version for 'org.corleon:corleon'? 
[1.1-SNAPSHOT]

[INFO] 
----------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO] 
----------------------------------------------------------------------------
[INFO] groupId was null
[INFO] 
----------------------------------------------------------------------------
[INFO] Trace
java.lang.NullPointerException: groupId was null
        at 
org.apache.maven.artifact.ArtifactUtils.versionlessKey(ArtifactUtils.java:47)
        at 
org.apache.maven.plugins.release.helpers.ProjectScmRewriter.restoreScmInfo(ProjectScmRewriter.java:51)
        at 
org.apache.maven.plugins.release.PrepareReleaseMojo.execute(PrepareReleaseMojo.java:259)
        at 
org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:399)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:519)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:482)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:452)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:301)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:214)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:137)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:316)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:113)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:249)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
        at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
[INFO] 
----------------------------------------------------------------------------
[INFO] Total time: 28 seconds
[INFO] Finished at: Sat Nov 12 02:33:49 IST 2005
[INFO] Final Memory: 3M/6M
[INFO] 
----------------------------------------------------------------------------

When I add the groupId to the child POM it works ok.

Seems to me that the group ID should be inherited from the parent POM as well, 
no?

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