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} -- This message was sent by Atlassian JIRA (v6.1.6#6162)