multiple JREs can cause NullPointerException with mvn eclipse:eclipse ---------------------------------------------------------------------
Key: MECLIPSE-550 URL: http://jira.codehaus.org/browse/MECLIPSE-550 Project: Maven 2.x Eclipse Plugin Issue Type: Bug Affects Versions: 2.6 Environment: XUbuntu 8.10. Eclipse 3.4.2. Maven 2.0.10 later updated to Maven 2.1.0. Reporter: David Craft This bug appeared when I changed the version of the maven-eclipse-plugin in my pom from 2.5.1 to 2.6. After the change when I would try to run 'mvn eclipse:eclipse' on the project, I would get the following stacktrace: [INFO] Using Eclipse Workspace: /home/xxxxx/workspace [INFO] ------------------------------------------------------------------------ [ERROR] FATAL ERROR [INFO] ------------------------------------------------------------------------ [INFO] null [INFO] ------------------------------------------------------------------------ [INFO] Trace java.lang.NullPointerException at org.apache.maven.plugin.eclipse.reader.ReadWorkspaceLocations.readAvailableJREs(ReadWorkspaceLocations.java:474) at org.apache.maven.plugin.eclipse.reader.ReadWorkspaceLocations.detectDefaultJREContainer(ReadWorkspaceLocations.java:206) at org.apache.maven.plugin.eclipse.reader.ReadWorkspaceLocations.init(ReadWorkspaceLocations.java:93) at org.apache.maven.plugin.eclipse.EclipsePlugin.getWorkspaceConfiguration(EclipsePlugin.java:1784) at org.apache.maven.plugin.eclipse.EclipsePlugin.fillDefaultClasspathContainers(EclipsePlugin.java:1350) at org.apache.maven.plugin.eclipse.EclipsePlugin.setup(EclipsePlugin.java:807) at org.apache.maven.plugin.ide.AbstractIdeSupportMojo.execute(AbstractIdeSupportMojo.java:498) at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:483) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:678) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:553) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:523) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:371) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:332) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:181) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:356) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:137) at org.apache.maven.cli.MavenCli.main(MavenCli.java:356) 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:597) 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: 3 seconds [INFO] Finished at: Wed Apr 08 10:03:15 EDT 2009 [INFO] Final Memory: 24M/136M [INFO] ------------------------------------------------------------------------ When I would change the version back to 2.5.1 it would again work fine. In eclipse preferences -> java -> Installed JREs I had 4 JREs listed. They were (in order) The GCJ, Java-6-sun-1.6, Java-6-sun-1.6.0.10, and another GCJ. The one selected was the authentic Sun Java-6-sun-1.6.0.10 version. Noticing it was complaining on "readAvailableJREs" I deleted all the unused ones. It now worked perfectly. ~David -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://jira.codehaus.org/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira