Dominique Broeglin created MNG-5613:
---------------------------------------

             Summary: NPE error when building a reactor with duplicated 
artifacts
                 Key: MNG-5613
                 URL: https://jira.codehaus.org/browse/MNG-5613
             Project: Maven 2 & 3
          Issue Type: Bug
    Affects Versions: 3.2.1
            Reporter: Dominique Broeglin


Using v3.2.1 when building a malformed project containing a duplicated 
groupId:artifactId I got this rather unhelpful error:

{code}
[ERROR] Internal error: java.lang.NullPointerException -> [Help 1]
org.apache.maven.InternalErrorException: Internal error: 
java.lang.NullPointerException
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:167)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:584)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:213)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:157)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: java.lang.NullPointerException
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:270)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:155)
        ... 11 more
{code}

The more helpful error should have been:
{code}
org.apache.maven.project.DuplicateProjectException: Project 
'com.foo.bar:foo-bar:2.15.0' is duplicated in the reactor
        at org.apache.maven.project.ProjectSorter.<init>(ProjectSorter.java:93)
        at 
org.apache.maven.DefaultProjectDependencyGraph.<init>(DefaultProjectDependencyGraph.java:53)
        at 
org.apache.maven.DefaultMaven.createProjectDependencyGraph(DefaultMaven.java:819)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:268)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:155)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:584)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:213)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:157)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
{code}



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