[jira] (MECLIPSE-738) NullPointerException in LinkedResource if is present in .project

["Andreas Gudian (JIRA)" <ji...@codehaus.org>]

     [ https://jira.codehaus.org/browse/MECLIPSE-738?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andreas Gudian reassigned MECLIPSE-738:
---------------------------------------

    Assignee: Andreas Gudian

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