Random usage in JBDS cases following exception stack trace. Found Eclipse BUG that seems related: https://bugs.eclipse.org/bugs/show_bug.cgi?id=294569

Exception:

Error
Tue May 11 14:26:45 EDT 2010
Problems occurred when invoking code from plug-in: "org.eclipse.jface".

java.lang.NoClassDefFoundError: org/eclipse/jst/j2ee/project/JavaEEProjectUtilities
at org.jboss.ide.eclipse.as.ui.actions.ChangeTimeStampActionDelegate.computeEnabled(ChangeTimeStampActionDelegate.java:75)
at org.jboss.ide.eclipse.as.ui.actions.ChangeTimeStampActionDelegate.selectionChanged(ChangeTimeStampActionDelegate.java:54)
at org.eclipse.ui.internal.PluginAction.refreshEnablement(PluginAction.java:206)
at org.eclipse.ui.internal.PluginAction.selectionChanged(PluginAction.java:277)
at org.eclipse.ui.internal.PluginAction.selectionChanged(PluginAction.java:299)
at org.eclipse.ui.internal.AbstractSelectionService.fireSelection(AbstractSelectionService.java:156)
at org.eclipse.ui.internal.AbstractSelectionService$1.selectionChanged(AbstractSelectionService.java:62)
at org.eclipse.jface.viewers.Viewer$2.run(Viewer.java:162)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.runtime.Platform.run(Platform.java:888)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
at org.eclipse.jface.viewers.Viewer.fireSelectionChanged(Viewer.java:160)
at org.eclipse.jface.viewers.StructuredViewer.updateSelection(StructuredViewer.java:2132)
at org.eclipse.jface.viewers.StructuredViewer.handleSelect(StructuredViewer.java:1160)
at org.eclipse.jface.viewers.StructuredViewer$4.widgetSelected(StructuredViewer.java:1190)
at org.eclipse.jface.util.OpenStrategy.fireSelectionEvent(OpenStrategy.java:228)
at org.eclipse.jface.util.OpenStrategy.access$4(OpenStrategy.java:222)
at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:389)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1598)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1622)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1607)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1396)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3484)
at org.eclipse.swt.widgets.Display.runPopups(Display.java:3535)
at org.eclipse.swt.widgets.Control.kEventControlTrack(Control.java:2095)
at org.eclipse.swt.widgets.Widget.controlProc(Widget.java:375)
at org.eclipse.swt.widgets.Display.controlProc(Display.java:863)
at org.eclipse.swt.internal.carbon.OS.CallNextEventHandler(Native Method)
at org.eclipse.swt.widgets.Tree.kEventMouseDown(Tree.java:2653)
at org.eclipse.swt.widgets.Widget.mouseProc(Widget.java:1362)
at org.eclipse.swt.widgets.Display.mouseProc(Display.java:2930)
at org.eclipse.swt.internal.carbon.OS.SendEventToEventTarget(Native Method)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3051)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
at org.eclipse.equinox.launcher.Main.run(Main.java:1311)
Caused by: org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter$TerminatingClassNotFoundException: An error occurred while automatically activating bundle org.eclipse.jst.j2ee (387).
at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:125)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:449)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:211)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:381)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:457)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:398)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:105)
at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
at org.eclipse.osgi.internal.loader.BundleLoader.loadClass(BundleLoader.java:326)
at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:231)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1193)
at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:160)
at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:874)
at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:51)
at org.eclipse.jdt.core.JavaCore.computeClasspathContainerInitializer(JavaCore.java:2699)
at org.eclipse.jdt.core.JavaCore.getClasspathContainerInitializer(JavaCore.java:2675)
at org.eclipse.jdt.internal.core.JavaModelManager.initializeContainer(JavaModelManager.java:2623)
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)
Caused by: org.osgi.framework.BundleException: Exception in org.eclipse.jst.j2ee.internal.plugin.J2EEPlugin.start() of bundle org.eclipse.jst.j2ee.
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:806)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:755)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:352)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:280)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:408)
at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:111)
... 25 more
Caused by: java.lang.ExceptionInInitializerError
at org.jboss.tools.common.model.options.PreferenceModelUtilities.getPreferenceModel(PreferenceModelUtilities.java:43)
at org.jboss.tools.common.model.ui.editor.XMLContentDescriber.describe(XMLContentDescriber.java:44)
at org.jboss.tools.common.model.ui.editor.XMLContentDescriber.describe(XMLContentDescriber.java:33)
at org.eclipse.core.internal.content.ContentType.describe(ContentType.java:161)
at org.eclipse.core.internal.content.ContentTypeCatalog.collectMatchingByContents(ContentTypeCatalog.java:189)
at org.eclipse.core.internal.content.ContentTypeCatalog.internalFindContentTypesFor(ContentTypeCatalog.java:359)
at org.eclipse.core.internal.content.ContentTypeCatalog.internalFindContentTypesFor(ContentTypeCatalog.java:406)
at org.eclipse.core.internal.content.ContentTypeCatalog.getDescriptionFor(ContentTypeCatalog.java:303)
at org.eclipse.core.internal.content.ContentTypeCatalog.getDescriptionFor(ContentTypeCatalog.java:317)
at org.eclipse.core.internal.content.ContentTypeMatcher.getDescriptionFor(ContentTypeMatcher.java:86)
at org.eclipse.emf.ecore.resource.impl.PlatformContentHandlerImpl.contentDescription(PlatformContentHandlerImpl.java:92)
at org.eclipse.emf.ecore.resource.impl.URIHandlerImpl.contentDescription(URIHandlerImpl.java:267)
at org.eclipse.emf.ecore.resource.impl.ExtensibleURIConverterImpl.contentDescription(ExtensibleURIConverterImpl.java:313)
at org.eclipse.emf.ecore.resource.impl.ResourceFactoryRegistryImpl.getContentTypeIdentifier(ResourceFactoryRegistryImpl.java:164)
at org.eclipse.emf.ecore.resource.impl.ResourceFactoryRegistryImpl.getFactory(ResourceFactoryRegistryImpl.java:130)
at org.eclipse.emf.ecore.resource.impl.ResourceFactoryRegistryImpl.getFactory(ResourceFactoryRegistryImpl.java:75)
at org.eclipse.wst.common.internal.emf.utilities.DefaultOverridableResourceFactoryRegistry.delegatedGetFactory(DefaultOverridableResourceFactoryRegistry.java:73)
at org.eclipse.jst.j2ee.common.internal.impl.J2EEResourceFactoryRegistry.delegatedGetFactory(J2EEResourceFactoryRegistry.java:27)
at org.eclipse.wst.common.internal.emf.utilities.DefaultOverridableResourceFactoryRegistry.getFactory(DefaultOverridableResourceFactoryRegistry.java:53)
at org.eclipse.wst.common.internal.emf.resource.FileNameResourceFactoryRegistry.getFactory(FileNameResourceFactoryRegistry.java:64)
at org.eclipse.wst.common.internal.emf.resource.FileNameResourceFactoryRegistry.getFactory(FileNameResourceFactoryRegistry.java:50)
at org.eclipse.jst.j2ee.internal.J2EEInit.initResourceFactories(J2EEInit.java:247)
at org.eclipse.jst.j2ee.internal.J2EEInit.init(J2EEInit.java:101)
at org.eclipse.jst.j2ee.commonarchivecore.internal.helpers.ArchiveInit.invokePrereqInits(ArchiveInit.java:65)
at org.eclipse.jst.j2ee.commonarchivecore.internal.helpers.ArchiveInit.init(ArchiveInit.java:38)
at org.eclipse.jst.j2ee.internal.plugin.J2EEPlugin.start(J2EEPlugin.java:508)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:783)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:774)
... 30 more
Caused by: java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
at java.util.AbstractList$Itr.next(AbstractList.java:343)
at org.eclipse.wst.xml.core.internal.catalog.Catalog$InternalResolver.<init>(Catalog.java:142)
at org.eclipse.wst.xml.core.internal.catalog.Catalog.getOrCreateInternalResolver(Catalog.java:636)
at org.eclipse.wst.xml.core.internal.catalog.Catalog.resolvePublic(Catalog.java:705)
at org.eclipse.wst.xml.core.internal.catalog.Catalog.resolveSubordinateCatalogs(Catalog.java:722)
at org.eclipse.wst.xml.core.internal.catalog.Catalog$InternalResolver.resolvePublic(Catalog.java:269)
at org.eclipse.wst.xml.core.internal.catalog.Catalog.resolvePublic(Catalog.java:705)
at org.jboss.tools.common.xml.DtdResolver.getInputStream(DtdResolver.java:40)
at org.jboss.tools.common.xml.XMLEntityResolverImpl.resolveEntity(XMLEntityResolverImpl.java:50)
at org.apache.xerces.impl.XMLEntityManager.resolveEntity(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.jboss.tools.common.meta.impl.Parser.parse(MetaLibLoader.java:234)
at org.jboss.tools.common.meta.impl.Parser.parse(MetaLibLoader.java:227)
at org.jboss.tools.common.meta.impl.MetaLibLoader.parse(MetaLibLoader.java:155)
at org.jboss.tools.common.meta.impl.MetaLibLoader.load(MetaLibLoader.java:100)
at org.jboss.tools.common.meta.impl.MetaLibLoader.load(MetaLibLoader.java:65)
at org.jboss.tools.common.meta.impl.XMetaDataLoader.loadMetaModel(XMetaDataLoader.java:117)
at org.jboss.tools.common.meta.impl.XModelMetaDataImpl.<init>(XModelMetaDataImpl.java:52)
at org.jboss.tools.common.meta.impl.XModelMetaDataImpl.getInstance(XModelMetaDataImpl.java:44)
at org.jboss.tools.common.model.XModelFactory.createInstance(XModelFactory.java:33)
at org.jboss.tools.common.model.XModelFactory.getModel(XModelFactory.java:28)
at org.jboss.tools.common.model.options.PreferenceModelUtilities.createPreferenceModel(PreferenceModelUtilities.java:49)
at org.jboss.tools.common.model.options.PreferenceModelUtilities$PreferenceModelHolder.<clinit>(PreferenceModelUtilities.java:28)
... 59 more