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From Martin Böhm (JIRA) <j...@codehaus.org>
Subject [jira] (MECLIPSE-738) NullPointerException in LinkedResource if <locationURI> is present in .project
Date Wed, 13 Feb 2013 17:56:13 GMT
Martin Böhm created MECLIPSE-738:
------------------------------------

             Summary: NullPointerException in LinkedResource if <locationURI> is present
in .project
                 Key: MECLIPSE-738
                 URL: https://jira.codehaus.org/browse/MECLIPSE-738
             Project: Maven 2.x Eclipse Plugin
          Issue Type: Bug
    Affects Versions: 2.9
            Reporter: Martin Böhm
            Priority: Trivial
         Attachments: linkedResourceProblem.zip

I get a reproducable NullPointerException if I call eclipse:eclipse on a project that always
has a .project-file that contains links with <locationURI>-Tags.

{code}
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-eclipse-plugin:2.9:eclipse (default-cli)
on project linkedResourceProblem: Execution def
ault-cli of goal org.apache.maven.plugins:maven-eclipse-plugin:2.9:eclipse failed. NullPointerException
-> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-eclipse-plugin:2.9:eclipse
(default-cli)
 on project linkedResourceProblem: Execution default-cli of goal org.apache.maven.plugins:maven-eclipse-plugin:2.9:eclipse
failed.
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:225)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
        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:290)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-cli of goal
org.apache.maven.plugins:maven-eclipse-plugin:2.9:eclipse f
ailed.
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:110)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
        ... 19 more
Caused by: java.lang.NullPointerException
        at org.apache.maven.plugin.eclipse.LinkedResource.<init>(LinkedResource.java:131)
        at org.apache.maven.plugin.eclipse.writers.EclipseProjectWriter.write(EclipseProjectWriter.java:154)
        at org.apache.maven.plugin.eclipse.EclipsePlugin.writeConfiguration(EclipsePlugin.java:1232)
        at org.apache.maven.plugin.ide.AbstractIdeSupportMojo.execute(AbstractIdeSupportMojo.java:511)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
        ... 20 more
{code}

If I change the present <locationURI> to <location> in .project and call eclipse:eclipse
I won't get the error. Also if I call eclipse:clean before calling eclipse:eclipse the .project
file of course gets cleaned and will be created new, so temporary links get lost unfortunately.

I suppose it has to do with the following lines in org.apache.maven.plugin.eclipse.LinkedResource
and how the locationNode is retrieved.

{code}
119 	Xpp3Dom locationNode = node.getChild( "location" );
120 	Xpp3Dom locationURINode = node.getChild( "locationURI" );
{code} 

Possible workarounds:
- Call eclipse:clean before and recreate temporary links again.
- Replace all <locationURI> with <location> before calling eclipse:eclipse to
preserve temporary links.

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