[jbosstools-issues] [JBoss JIRA] Commented: (JBIDE-5980) Constantly get NPE when open JBDS workspace in Eclipse with WTP (+others) and then open it back in JBDS

[Tom Bryan (JIRA)]

    [ https://jira.jboss.org/jira/browse/JBIDE-5980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12529072#action_12529072 ] 

Tom Bryan commented on JBIDE-5980:
----------------------------------

I'm also seeing this issue:
Windows Vista
Eclipse 3.5.2, build 20100218-1602
JBoss Tools 3.1
JDK 1.6.0_19

Sometimes, when I start Eclipse, I get a NPE, such as the one listed above (an example from my workspace pasted below, but I think that they are the same).  Once I get this error, I basically have to restart.  Otherwise, I start seeing lots of strange problems, such as compilation errors and other errors reported by JDT in the error log.  If I successfully start Eclipse without getting this error, then the same project builds just fine, and I don't see the other JDT errors.  

This problem leaves our developers completely unable to work.  They have to keep restarting Eclipse until they can get a restart without an error.  If anyone has a fix or even a workaround, I'd love to hear it.

The problem is intermittent, so perhaps it is some sort of race condition.  Interestingly, I haven't seen the problem yet when running the same tools under Linux (same machine booted to a different OS).  

java.lang.NullPointerException
at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:280)
at org.eclipse.emf.common.notify.impl.NotifyingListImpl.dispatchNotification(NotifyingListImpl.java:267)
at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl$SynchronizedResourcesEList.dispatchNotification(ProjectResourceSetImpl.java:335)
at org.eclipse.emf.common.notify.impl.NotifyingListImpl.addUnique(NotifyingListImpl.java:300)
at org.eclipse.emf.common.util.AbstractEList.add(AbstractEList.java:307)
at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl$SynchronizedResourcesEList.add(ProjectResourceSetImpl.java:81)
at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl.createResource(ProjectResourceSetImpl.java:392)
at org.eclipse.wst.common.internal.emfworkbench.integration.ProjectResourceSetEditImpl.createResource(ProjectResourceSetEditImpl.java:48)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandCreateResource(ResourceSetImpl.java:239)
at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl.getResource(ProjectResourceSetImpl.java:693)
at org.eclipse.jst.jee.model.internal.JEE5ModelProvider.getModelResource(JEE5ModelProvider.java:155)
at org.eclipse.jst.jee.model.internal.EAR5ModelProvider.getModelObject(EAR5ModelProvider.java:50)
at org.eclipse.jst.j2ee.project.EarUtilities.getEARLibDir(EarUtilities.java:372)
at org.eclipse.jst.j2ee.internal.common.classpath.J2EEComponentClasspathContainer.getBaseEARLibRefs(J2EEComponentClasspathContainer.java:321)
at org.eclipse.jst.j2ee.internal.common.classpath.J2EEComponentClasspathContainer.update(J2EEComponentClasspathContainer.java:211)
at org.eclipse.jst.j2ee.internal.common.classpath.J2EEComponentClasspathContainer.install(J2EEComponentClasspathContainer.java:351)
at org.eclipse.jst.j2ee.internal.common.classpath.J2EEComponentClasspathInitializer.initialize(J2EEComponentClasspathInitializer.java:47)
at org.eclipse.jdt.internal.core.JavaModelManager.initializeContainer(JavaModelManager.java:2642)
at org.eclipse.jdt.internal.core.JavaModelManager$11.run(JavaModelManager.java:2548)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1800)
at org.eclipse.jdt.internal.core.JavaModelManager.initializeAllContainers(JavaModelManager.java:2588)
at org.eclipse.jdt.internal.core.JavaModelManager.getClasspathContainer(JavaModelManager.java:1808)
at org.eclipse.jdt.core.JavaCore.initializeAfterLoad(JavaCore.java:3410)
at org.eclipse.jdt.internal.ui.InitializeAfterLoadJob$RealJob.run(InitializeAfterLoadJob.java:35)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)


> Constantly get NPE when open JBDS workspace in Eclipse with WTP (+others) and then open it back in JBDS
> -------------------------------------------------------------------------------------------------------
>
>                 Key: JBIDE-5980
>                 URL: https://jira.jboss.org/jira/browse/JBIDE-5980
>             Project: Tools (JBoss Tools)
>          Issue Type: Sub-task
>          Components: UpStream
>    Affects Versions: 3.1.0.CR1
>            Reporter: Vitali Yemialyanchyk
>             Fix For: LATER
>
>
> I open eclipse issue for this: https://bugs.eclipse.org/bugs/show_bug.cgi?id=304070
> stacktrace look like this:
> java.lang.NullPointerException 
> at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:280) 
> at org.eclipse.emf.common.notify.impl.NotifyingListImpl.dispatchNotification(NotifyingListImpl.java:267) 
> at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl$SynchronizedResourcesEList.dispatchNotification(ProjectResourceSetImpl.java:335) 
> at org.eclipse.emf.common.notify.impl.NotifyingListImpl.addUnique(NotifyingListImpl.java:300) 
> at org.eclipse.emf.common.util.AbstractEList.add(AbstractEList.java:307) 
> at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl$SynchronizedResourcesEList.add(ProjectResourceSetImpl.java:81) 
> at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl.createResource(ProjectResourceSetImpl.java:392) 
> at org.eclipse.wst.common.internal.emfworkbench.integration.ProjectResourceSetEditImpl.createResource(ProjectResourceSetEditImpl.java:48) 
> at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandCreateResource(ResourceSetImpl.java:239) 
> at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl.getResource(ProjectResourceSetImpl.java:693) 
> at org.eclipse.jst.jee.model.internal.JEE5ModelProvider.getModelResource(JEE5ModelProvider.java:155) 
> at org.eclipse.jst.jee.model.internal.EAR5ModelProvider.getModelObject(EAR5ModelProvider.java:50) 
> at org.eclipse.jst.j2ee.project.EarUtilities.getEARLibDir(EarUtilities.java:372) 

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