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https://jira.codehaus.org/browse/MNG-5613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=346075#comment-346075
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Sébastian Le Merdy commented on MNG-5613:
-----------------------------------------
I've followed [this
guide|http://maven.apache.org/guides/development/guide-m2-development.html#Dont_forget_tests]
to run the integration tests. Result was ok (but took a lot of time :))
> 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
> Attachments: foo.zip
>
>
> 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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