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
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