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https://jira.codehaus.org/browse/MNG-5637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=346904#comment-346904
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Ondrej Zizka commented on MNG-5637:
-----------------------------------
Maven 3.1.1 correctly reveals what's wrong:
Two or more projects in the reactor have the same identifier, please make sure
that <groupId>:<artifactId>:<version> is unique for each project:
{org.jboss.windup.test.apps.jboss:sample-jee-jboss-web:2.0.0-SNAPSHOT=[/home/ondra/work/Migration/WindUp/sample-apps/jee-example-jboss/jee-example-web/pom.xml,
/home/ondra/work/Migration/WindUp/sample-apps/jee-example-weblogic/jee-example-web/pom.xml]}
-> [Help 1]
> NPE in org.apache.maven.DefaultMaven.execute()
> ----------------------------------------------
>
> Key: MNG-5637
> URL: https://jira.codehaus.org/browse/MNG-5637
> Project: Maven 2 & 3
> Issue Type: Bug
> Components: Command Line
> Affects Versions: 3.2.1
> Environment: $ mvn -v
> Apache Maven 3.2.1 (ea8b2b07643dbb1b84b6d16e1f08391b666bc1e9;
> 2014-02-14T18:37:52+01:00)
> Maven home: /home/ondra/sw/prog/maven/3.2.1
> Java version: 1.7.0_55, vendor: Oracle Corporation
> Java home: /usr/lib/jvm/java-7-openjdk-amd64/jre
> Default locale: en_US, platform encoding: UTF-8
> OS name: "linux", version: "3.11.0-20-generic", arch: "amd64", family: "unix"
> Reporter: Ondrej Zizka
> Priority: Critical
>
> Steps to reproduce:
> git clone g...@github.com:windup/windup.git
> cd windup
> git checkout MavenNPE
> mvn clean install
> Result:
> {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:606)
> 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}
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