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I have this configuration: ============================================== Spring Tool Suite Version: 3.8.4.RELEASE Build Id: 201703310825 Platform: Eclipse Neon.3 (4.6.3) Operating System: macOS Sierra 10.12.2 (16C67) ============================================== Using the Working Sets in the "Project Explorer", STS hangs and freezes trying to expand the java resources folder of a Maven Project. It happens with big projects, and I'm forced to close the IDE. Disabling the Working sets, the issue disappears. I have opened a bug to Spring Tool Suite development team, they redirect me to this link after I attached them this dump: jstack -l 2114 2017-06-28 14:14:58 Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.121-b13 mixed mode): "Worker-51" #115 prio=5 os_prio=31 tid=0x000000012477d800 nid=0x16523 in Object.wait() [0x000070001485f000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) at org.eclipse.core.internal.jobs.WorkerPool.sleep(WorkerPool.java:188) - locked <0x0000000740e62820> (a org.eclipse.core.internal.jobs.WorkerPool) at org.eclipse.core.internal.jobs.WorkerPool.startJob(WorkerPool.java:220) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:52) Locked ownable synchronizers: - None "Worker-50" #114 prio=5 os_prio=31 tid=0x0000000124195000 nid=0x13563 in Object.wait() [0x000070000c532000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) at org.eclipse.core.internal.jobs.WorkerPool.sleep(WorkerPool.java:188) - locked <0x0000000740e62820> (a org.eclipse.core.internal.jobs.WorkerPool) at org.eclipse.core.internal.jobs.WorkerPool.startJob(WorkerPool.java:220) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:52) Locked ownable synchronizers: - None "Attach Listener" #113 daemon prio=9 os_prio=31 tid=0x00000001223a6800 nid=0x1342b waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE Locked ownable synchronizers: - None "Worker-49" #112 prio=5 os_prio=31 tid=0x0000000124f8a000 nid=0x12297 in Object.wait() [0x00007000102cd000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) at org.eclipse.core.internal.jobs.WorkerPool.sleep(WorkerPool.java:188) - locked <0x0000000740e62820> (a org.eclipse.core.internal.jobs.WorkerPool) at org.eclipse.core.internal.jobs.WorkerPool.startJob(WorkerPool.java:220) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:52) Locked ownable synchronizers: - None "Worker-46" #109 prio=5 os_prio=31 tid=0x0000000100ceb800 nid=0xc80f in Object.wait() [0x0000700015ce8000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) at org.eclipse.core.internal.jobs.WorkerPool.sleep(WorkerPool.java:188) - locked <0x0000000740e62820> (a org.eclipse.core.internal.jobs.WorkerPool) at org.eclipse.core.internal.jobs.WorkerPool.startJob(WorkerPool.java:220) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:52) Locked ownable synchronizers: - None "[ThreadPool Manager] - Idle Thread" #91 daemon prio=5 os_prio=31 tid=0x0000000105352800 nid=0x1440b in Object.wait() [0x000070002a7ce000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:502) at org.eclipse.equinox.internal.util.impl.tpt.threadpool.Executor.run(Executor.java:106) - locked <0x000000074d0b1710> (a org.eclipse.equinox.internal.util.impl.tpt.threadpool.Executor) Locked ownable synchronizers: - None "Thread-16" #79 prio=5 os_prio=31 tid=0x0000000129e8e000 nid=0x16f03 waiting on condition [0x0000700029dcb000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at com.objectaid.uml.license.LicenseManager.createSocket(LicenseManager.java:180) at com.objectaid.uml.license.LicenseManager$1.run(LicenseManager.java:121) Locked ownable synchronizers: - None "Timer-2" #78 prio=5 os_prio=31 tid=0x00000001249bd800 nid=0x16107 in Object.wait() [0x00007000289c5000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.util.TimerThread.mainLoop(Timer.java:552) - locked <0x000000074909f9a0> (a java.util.TaskQueue) at java.util.TimerThread.run(Timer.java:505) Locked ownable synchronizers: - None "SVN Kit 1.8 Connector" #77 prio=5 os_prio=31 tid=0x000000012453e000 nid=0x16c07 in Object.wait() [0x0000700027fc2000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:502) at org.polarion.team.svn.connector.svnkit.SVNKitService$ProgressMonitorThread.run(SVNKitService.java:201) - locked <0x0000000748727870> (a java.util.ArrayList) Locked ownable synchronizers: - None "Timer-1" #76 daemon prio=5 os_prio=31 tid=0x000000012a33b800 nid=0x16b0b in Object.wait() [0x000070002623c000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.util.TimerThread.mainLoop(Timer.java:552) - locked <0x000000074871c768> (a java.util.TaskQueue) at java.util.TimerThread.run(Timer.java:505) Locked ownable synchronizers: - None "Provisioning Event Dispatcher" #73 daemon prio=5 os_prio=31 tid=0x000000012a20b000 nid=0x16903 in Object.wait() [0x00007000293c8000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:502) at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.getNextEvent(EventManager.java:400) - locked <0x00000007488c5bd0> (a org.eclipse.osgi.framework.eventmgr.EventManager$EventThread) at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:336) Locked ownable synchronizers: - None "Timer-0" #70 prio=5 os_prio=31 tid=0x000000012212d000 nid=0x16303 in Object.wait() [0x00007000275bf000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.util.TimerThread.mainLoop(Timer.java:552) - locked <0x000000074878b868> (a java.util.TaskQueue) at java.util.TimerThread.run(Timer.java:505) Locked ownable synchronizers: - None "org.eclipse.wst.sse.ui.internal.reconcile.StructuredRegionProcessor" #36 daemon prio=1 os_prio=31 tid=0x0000000124994000 nid=0x10c07 in Object.wait() [0x0000700013459000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) at org.eclipse.wst.sse.ui.internal.reconcile.DirtyRegionProcessor$BackgroundThread.run(DirtyRegionProcessor.java:667) - locked <0x00000007444c4f60> (a java.util.Collections$SynchronizedRandomAccessList) Locked ownable synchronizers: - None "org.eclipse.wst.sse.ui.internal.reconcile.StructuredRegionProcessor" #34 daemon prio=1 os_prio=31 tid=0x0000000105069000 nid=0x10613 in Object.wait() [0x0000700012a56000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) at org.eclipse.wst.sse.ui.internal.reconcile.DirtyRegionProcessor$BackgroundThread.run(DirtyRegionProcessor.java:667) - locked <0x000000074456d0d0> (a java.util.Collections$SynchronizedRandomAccessList) Locked ownable synchronizers: - None "JavaScript indexing" #33 daemon prio=4 os_prio=31 tid=0x00000001242d6000 nid=0x10a0b in Object.wait() [0x0000700012053000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:502) at org.eclipse.wst.jsdt.internal.core.search.processing.JobManager.run(JobManager.java:370) - locked <0x00000007447de7c0> (a org.eclipse.wst.jsdt.internal.core.search.indexing.IndexManager) at java.lang.Thread.run(Thread.java:745) Locked ownable synchronizers: - None "EventAdmin Async Event Dispatcher Thread" #30 daemon prio=6 os_prio=31 tid=0x0000000102b69800 nid=0xe50f in Object.wait() [0x000070001154a000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:502) at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.getNextEvent(EventManager.java:400) - locked <0x00000007437392a0> (a org.eclipse.osgi.framework.eventmgr.EventManager$EventThread) at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:336) Locked ownable synchronizers: - None "Java indexing" #26 daemon prio=4 os_prio=31 tid=0x00000001208c6800 nid=0xd413 in Object.wait() [0x000070000f741000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:502) at org.eclipse.jdt.internal.core.search.processing.JobManager.run(JobManager.java:371) - locked <0x0000000742c32150> (a org.eclipse.jdt.internal.core.search.indexing.IndexManager) at java.lang.Thread.run(Thread.java:745) Locked ownable synchronizers: - None "Thread-2" #19 daemon prio=1 os_prio=31 tid=0x00000001052ed000 nid=0xd203 waiting on condition [0x000070000ed3e000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x0000000740c53530> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039) at java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:403) at org.eclipse.equinox.weaving.internal.caching.CacheWriter$1.run(CacheWriter.java:47) at java.lang.Thread.run(Thread.java:745) Locked ownable synchronizers: - None "EMF Reference Cleaner" #18 daemon prio=5 os_prio=31 tid=0x0000000100d9a000 nid=0xd003 in Object.wait() [0x000070000e33b000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143) - locked <0x00000007411c39b0> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164) at org.eclipse.emf.common.util.CommonUtil$1ReferenceClearingQueuePollingThread.run(CommonUtil.java:70) Locked ownable synchronizers: - None "Worker-JM" #17 prio=5 os_prio=31 tid=0x0000000105467000 nid=0xce0b in Object.wait() [0x000070000d938000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at org.eclipse.core.internal.jobs.InternalWorker.run(InternalWorker.java:59) - locked <0x0000000740e62b30> (a java.util.ArrayList) Locked ownable synchronizers: - None "[Timer] - Main Queue Handler" #16 daemon prio=5 os_prio=31 tid=0x0000000100b59800 nid=0xca03 in Object.wait() [0x000070000cf35000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) at org.eclipse.equinox.internal.util.impl.tpt.timer.TimerImpl.run(TimerImpl.java:141) - locked <0x00000007411c3d38> (a java.lang.Object) at java.lang.Thread.run(Thread.java:745) Locked ownable synchronizers: - None "Start Level: Equinox Container: 3cd71cda-c689-4d2d-83bc-b846b9c9ca46" #14 daemon prio=5 os_prio=31 tid=0x0000000102a23000 nid=0xb503 in Object.wait() [0x000070000bb2f000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:502) at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.getNextEvent(EventManager.java:400) - locked <0x0000000740bf0a90> (a org.eclipse.osgi.framework.eventmgr.EventManager$EventThread) at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:336) Locked ownable synchronizers: - None "Framework Event Dispatcher: org.eclipse.osgi.internal.framework.EquinoxEventPublisher@23468512" #13 daemon prio=5 os_prio=31 tid=0x0000000100b6c800 nid=0xb303 in Object.wait() [0x000070000b12c000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:502) at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.getNextEvent(EventManager.java:400) - locked <0x00000007411e3a60> (a org.eclipse.osgi.framework.eventmgr.EventManager$EventThread) at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:336) Locked ownable synchronizers: - None "Bundle File Closer" #12 daemon prio=5 os_prio=31 tid=0x000000010178f000 nid=0xb103 in Object.wait() [0x000070000a729000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:502) at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.getNextEvent(EventManager.java:400) - locked <0x00000007411e3fd0> (a org.eclipse.osgi.framework.eventmgr.EventManager$EventThread) at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:336) Locked ownable synchronizers: - None "Active Thread: Equinox Container: 3cd71cda-c689-4d2d-83bc-b846b9c9ca46" #10 prio=5 os_prio=31 tid=0x00000001013cc000 nid=0xae13 waiting on condition [0x0000700009d26000] java.lang.Thread.State: TIMED_WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000007411e4688> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809) at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Locked ownable synchronizers: - None "Service Thread" #8 daemon prio=9 os_prio=31 tid=0x0000000100891000 nid=0x6e03 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE Locked ownable synchronizers: - None "C1 CompilerThread2" #7 daemon prio=9 os_prio=31 tid=0x0000000100886000 nid=0x6c03 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE Locked ownable synchronizers: - None "C2 CompilerThread1" #6 daemon prio=9 os_prio=31 tid=0x000000010087b800 nid=0x6a03 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE Locked ownable synchronizers: - None "C2 CompilerThread0" #5 daemon prio=9 os_prio=31 tid=0x000000010087a000 nid=0x6803 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE Locked ownable synchronizers: - None "Signal Dispatcher" #4 daemon prio=9 os_prio=31 tid=0x000000010103c800 nid=0x6603 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE Locked ownable synchronizers: - None "Finalizer" #3 daemon prio=8 os_prio=31 tid=0x0000000101037000 nid=0x6103 in Object.wait() [0x0000700007b11000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143) - locked <0x00000007407d6a48> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164) at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209) Locked ownable synchronizers: - None "Reference Handler" #2 daemon prio=10 os_prio=31 tid=0x000000010102d800 nid=0x5f03 in Object.wait() [0x000070000710e000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:502) at java.lang.ref.Reference.tryHandlePending(Reference.java:191) - locked <0x00000007407d6a88> (a java.lang.ref.Reference$Lock) at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153) Locked ownable synchronizers: - None "main" #1 prio=6 os_prio=31 tid=0x000000010082c000 nid=0x307 runnable [0x00007fff5fbf9000] java.lang.Thread.State: RUNNABLE at java.util.HashMap.hash(HashMap.java:338) at java.util.HashMap.get(HashMap.java:556) at java.util.Collections$SynchronizedMap.get(Collections.java:2584) - locked <0x000000074324d960> (a java.util.Collections$SynchronizedMap) at org.eclipse.jdt.internal.core.ExternalFoldersManager.getFolder(ExternalFoldersManager.java:324) at org.eclipse.jdt.internal.core.JavaProject.contains(JavaProject.java:761) at org.eclipse.jdt.internal.core.JavaModel.contains(JavaModel.java:94) at org.eclipse.jdt.internal.ui.JavaElementContainmentAdapter.contains(JavaElementContainmentAdapter.java:43) at org.eclipse.ui.ResourceWorkingSetFilter.isEnclosed(ResourceWorkingSetFilter.java:97) at org.eclipse.ui.ResourceWorkingSetFilter.select(ResourceWorkingSetFilter.java:63) at org.eclipse.jface.viewers.ViewerFilter.filter(ViewerFilter.java:56) at org.eclipse.ui.ResourceWorkingSetFilter.filter(ResourceWorkingSetFilter.java:159) at org.eclipse.jdt.internal.ui.navigator.NonEssentialElementsFilter.hasFilteredChildren(NonEssentialElementsFilter.java:79) at org.eclipse.jdt.internal.ui.navigator.NonEssentialElementsFilter.select(NonEssentialElementsFilter.java:65) at org.eclipse.jface.viewers.ViewerFilter.filter(ViewerFilter.java:56) at org.eclipse.jdt.internal.ui.navigator.NonEssentialElementsFilter.hasFilteredChildren(NonEssentialElementsFilter.java:79) at org.eclipse.jdt.internal.ui.navigator.NonEssentialElementsFilter.select(NonEssentialElementsFilter.java:65) at org.eclipse.jface.viewers.ViewerFilter.filter(ViewerFilter.java:56) at org.eclipse.jdt.internal.ui.navigator.NonEssentialElementsFilter.hasFilteredChildren(NonEssentialElementsFilter.java:79) at org.eclipse.jdt.internal.ui.navigator.NonEssentialElementsFilter.select(NonEssentialElementsFilter.java:65) at org.eclipse.jface.viewers.ViewerFilter.filter(ViewerFilter.java:56) at org.eclipse.jdt.internal.ui.navigator.NonEssentialElementsFilter.hasFilteredChildren(NonEssentialElementsFilter.java:79) at org.eclipse.jdt.internal.ui.navigator.NonEssentialElementsFilter.select(NonEssentialElementsFilter.java:65) at org.eclipse.jface.viewers.ViewerFilter.filter(ViewerFilter.java:56) at org.eclipse.jdt.internal.ui.navigator.NonEssentialElementsFilter.hasFilteredChildren(NonEssentialElementsFilter.java:79) at org.eclipse.jdt.internal.ui.navigator.NonEssentialElementsFilter.select(NonEssentialElementsFilter.java:65) at org.eclipse.jface.viewers.ViewerFilter.filter(ViewerFilter.java:56) at org.eclipse.jface.viewers.StructuredViewer.getFilteredChildren(StructuredViewer.java:911) at org.eclipse.jface.viewers.AbstractTreeViewer.getSortedChildren(AbstractTreeViewer.java:621) at org.eclipse.jface.viewers.AbstractTreeViewer.lambda$0(AbstractTreeViewer.java:815) at org.eclipse.jface.viewers.AbstractTreeViewer$$Lambda$49/1135738295.run(Unknown Source) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:795) at org.eclipse.jface.viewers.TreeViewer.createChildren(TreeViewer.java:596) at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:766) at org.eclipse.jface.viewers.AbstractTreeViewer.handleTreeExpand(AbstractTreeViewer.java:1493) at org.eclipse.jface.viewers.TreeViewer.handleTreeExpand(TreeViewer.java:882) at org.eclipse.jface.viewers.AbstractTreeViewer$3.treeExpanded(AbstractTreeViewer.java:1505) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:133) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4256) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1501) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1524) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1509) at org.eclipse.swt.widgets.TreeItem.sendExpand(TreeItem.java:1050) at org.eclipse.swt.widgets.Tree.expandItem_expandChildren(Tree.java:1278) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5996) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:227) at org.eclipse.swt.widgets.Widget.mouseDownSuper(Widget.java:1135) at org.eclipse.swt.widgets.Tree.mouseDownSuper(Tree.java:2102) at org.eclipse.swt.widgets.Widget.mouseDown(Widget.java:1127) at org.eclipse.swt.widgets.Control.mouseDown(Control.java:2624) at org.eclipse.swt.widgets.Tree.mouseDown(Tree.java:2069) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5733) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:227) at org.eclipse.swt.widgets.Widget.windowSendEvent(Widget.java:2140) at org.eclipse.swt.widgets.Shell.windowSendEvent(Shell.java:2402) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5797) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Display.applicationSendEvent(Display.java:5226) at org.eclipse.swt.widgets.Display.applicationProc(Display.java:5375) at org.eclipse.swt.internal.cocoa.OS.objc_msgSend(Native Method) at org.eclipse.swt.internal.cocoa.NSApplication.sendEvent(NSApplication.java:128) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3703) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1121) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1022) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:150) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:693) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:610) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:138) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:673) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:610) at org.eclipse.equinox.launcher.Main.run(Main.java:1519) Locked ownable synchronizers: - None "VM Thread" os_prio=31 tid=0x0000000105012000 nid=0x5d03 runnable "GC task thread#0 (ParallelGC)" os_prio=31 tid=0x000000010083c000 nid=0x5503 runnable "GC task thread#1 (ParallelGC)" os_prio=31 tid=0x000000010083d000 nid=0x5703 runnable "GC task thread#2 (ParallelGC)" os_prio=31 tid=0x000000010083d800 nid=0x5903 runnable "GC task thread#3 (ParallelGC)" os_prio=31 tid=0x000000010083e000 nid=0x5b03 runnable "VM Periodic Task Thread" os_prio=31 tid=0x000000010103e000 nid=0x7003 waiting on condition JNI global references: 4314
@Allesandro: if this is reproducible please take several stack traces in succession so we can see better, where it hangs. @Noopur, could this be caused in NonEssentialElementsFilter?
*** This bug has been marked as a duplicate of bug 439123 ***
