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This happened with N20060601-1100, i.e. with a build from the day before 3.2RC7 was declared. I have all Platform UI plugins and all Mylar plugins in my workspace. The package explorer is linked to the current editor (don't know if this is relevant). Whenever I change the selection, I have to wait for about a second while Eclipse is busy. It does not show a busy cursor though. Here is a stack trace obtained by pressing Ctrl-Break in the console, apparently some class path initialization is happening over and over again: "main" prio=7 tid=0x00036080 nid=0x2e4 runnable [7e000..7fc40] at java.util.zip.ZipFile.getNextEntry(Native Method) at java.util.zip.ZipFile.access$400(Unknown Source) at java.util.zip.ZipFile$2.nextElement(Unknown Source) - locked <0x101387b0> (a java.util.zip.ZipFile) at org.eclipse.jdt.internal.core.util.Util.getJdkLevel(Util.java:815) at org.eclipse.jdt.internal.core.ClasspathEntry.validateClasspathEntry(C lasspathEntry.java:1642) at org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath(JavaPr oject.java:2182) at org.eclipse.jdt.internal.core.DeltaProcessingState$ProjectUpdateInfo. updateProjectReferencesIfNecessary(DeltaProcessingState.java:102) at org.eclipse.jdt.internal.core.DeltaProcessingState.updateProjectRefer ences(DeltaProcessingState.java:245) at org.eclipse.jdt.internal.core.SetClasspathOperation.updateProjectRefe rencesIfNecessary(SetClasspathOperation.java:804) at org.eclipse.jdt.internal.core.SetClasspathOperation.executeOperation( SetClasspathOperation.java:254) at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperati on.java:720) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1737 ) at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaMod elOperation.java:784) at org.eclipse.jdt.internal.core.JavaProject.setRawClasspath(JavaProject .java:3016) at org.eclipse.jdt.core.JavaCore$5.run(JavaCore.java:4214) at org.eclipse.jdt.internal.core.BatchOperation.executeOperation(BatchOp eration.java:39) at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperati on.java:720) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1737 ) at org.eclipse.jdt.core.JavaCore.run(JavaCore.java:4023) at org.eclipse.jdt.core.JavaCore.setClasspathContainer(JavaCore.java:419 7) at org.eclipse.jdt.internal.launching.JREContainerInitializer.initialize (JREContainerInitializer.java:57) at org.eclipse.jdt.internal.core.JavaModelManager.initializeContainer(Ja vaModelManager.java:1900) at org.eclipse.jdt.internal.core.JavaModelManager.getClasspathContainer( JavaModelManager.java:1267) at org.eclipse.jdt.core.JavaCore.getClasspathContainer(JavaCore.java:147 0) at org.eclipse.jdt.internal.core.JavaProject.isOnClasspath(JavaProject.j ava:2431) at org.eclipse.jdt.internal.ui.actions.ActionUtil.isOnBuildPath(ActionUt il.java:89) at org.eclipse.jdt.ui.actions.FindAction.canOperateOn(FindAction.java:10 5) at org.eclipse.jdt.ui.actions.FindImplementorsAction.canOperateOn(FindIm plementorsAction.java:71) at org.eclipse.jdt.ui.actions.FindAction.canOperateOn(FindAction.java:10 1) at org.eclipse.jdt.ui.actions.FindAction.selectionChanged(FindAction.jav a:258) at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchSelectionC hanged(SelectionDispatchAction.java:255) at org.eclipse.jdt.ui.actions.SelectionDispatchAction.selectionChanged(S electionDispatchAction.java:250) at org.eclipse.ui.part.PageBookView$4.run(PageBookView.java:246) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37) at org.eclipse.core.runtime.Platform.run(Platform.java:843) at org.eclipse.ui.part.PageBookView$SelectionManager.selectionChanged(Pa geBookView.java:244) at org.eclipse.ui.part.PageBookView$SelectionProvider.selectionChanged(P ageBookView.java:310) at org.eclipse.ui.part.PageBookView.pageSelectionChanged(PageBookView.ja va:885) at org.eclipse.ui.part.PageBookView.access$2(PageBookView.java:880) at org.eclipse.ui.part.PageBookView$2.selectionChanged(PageBookView.java :154) at org.eclipse.search.ui.text.AbstractTextSearchViewPage$SelectionProvid erAdapter.selectionChanged(AbstractTextSearchViewPage.java:187) at org.eclipse.jface.viewers.Viewer$2.run(Viewer.java:162) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37) at org.eclipse.core.runtime.Platform.run(Platform.java:843) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:44) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:149) at org.eclipse.jface.viewers.Viewer.fireSelectionChanged(Viewer.java:160 ) at org.eclipse.jface.viewers.StructuredViewer.updateSelection(Structured Viewer.java:1976) at org.eclipse.jface.viewers.StructuredViewer.handleSelect(StructuredVie wer.java:1128) at org.eclipse.jface.viewers.StructuredViewer$4.widgetSelected(Structure dViewer.java:1154) at org.eclipse.jface.util.OpenStrategy.fireSelectionEvent(OpenStrategy.j ava:213) at org.eclipse.jface.util.OpenStrategy.access$3(OpenStrategy.java:207) at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:3 74) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1914) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1878) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.jav a:419) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95 ) at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformAct ivator.java:78) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runAppli cation(EclipseAppLauncher.java:92) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(Ec lipseAppLauncher.java:68) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.ja va:400) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.ja va:177) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336) at org.eclipse.core.launcher.Main.basicRun(Main.java:280) at org.eclipse.core.launcher.Main.run(Main.java:977) at org.eclipse.core.launcher.Main.main(Main.java:952)
Could this be a corrupt workspace? I looked in the log if there was anything relevant, and now I found (further down) that this workspace may be corrupt - I ran out of disk space last time I had this workspace open. BTW - is there a recommended way to proceed if you think the workspace is corrupt? The log contains an entry from core.resources "A workspace crash was detected. The previous session did not exit normally.". Neither a full rebuild nor restarting Eclipse helped.
Frederic, This might have to do with caching the jdk level.
*** This bug has been marked as a duplicate of bug 159325 ***
