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Here is the stack of the UI freeze: at java.lang.Object.wait(Native Method) at org.eclipse.core.internal.jobs.Semaphore.acquire(Semaphore.java:39) at org.eclipse.core.internal.jobs.OrderedLock.doAcquire(OrderedLock.java:170) at org.eclipse.core.internal.jobs.OrderedLock.acquire(OrderedLock.java:106) at org.eclipse.core.internal.jobs.OrderedLock.acquire(OrderedLock.java:82) at org.eclipse.core.internal.resources.WorkManager.checkIn(WorkManager.java:121) at org.eclipse.core.internal.resources.Workspace.prepareOperation(Workspace.java:2189) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2236) at org.eclipse.ui.actions.WorkspaceModifyOperation.run(WorkspaceModifyOperation.java:130) at org.eclipse.ui.internal.editors.text.WorkspaceOperationRunner.run(WorkspaceOperationRunner.java:75) at org.eclipse.ui.internal.editors.text.WorkspaceOperationRunner.run(WorkspaceOperationRunner.java:65) at org.eclipse.ui.editors.text.TextFileDocumentProvider.executeOperation(TextFileDocumentProvider.java:456) at org.eclipse.ui.editors.text.TextFileDocumentProvider.validateState(TextFileDocumentProvider.java:1075) at org.eclipse.ui.texteditor.AbstractTextEditor.validateState(AbstractTextEditor.java:4965) at org.eclipse.ui.texteditor.AbstractTextEditor$24.run(AbstractTextEditor.java:5016) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.texteditor.AbstractTextEditor.validateEditorInputState(AbstractTextEditor.java:5011) at org.eclipse.ui.texteditor.StatusTextEditor.validateEditorInputState(StatusTextEditor.java:131) at org.eclipse.ui.texteditor.AbstractDecoratedTextEditor.validateEditorInputState(AbstractDecoratedTextEditor.java:1067) at org.eclipse.ui.texteditor.AbstractTextEditor$ElementStateListener$Validator.verifyText(AbstractTextEditor.java:370) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:273) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4481) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1329) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1353) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1338) at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1119) at org.eclipse.swt.custom.StyledText.modifyContent(StyledText.java:7276) at org.eclipse.swt.custom.StyledText.sendKeyEvent(StyledText.java:8159) at org.eclipse.swt.custom.StyledText.doContent(StyledText.java:2502) at org.eclipse.swt.custom.StyledText.handleKey(StyledText.java:5967) at org.eclipse.swt.custom.StyledText.handleKeyDown(StyledText.java:5998) at org.eclipse.swt.custom.StyledText$7.handleEvent(StyledText.java:5685) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4481) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1329) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1353) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1338) at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1365) at org.eclipse.swt.widgets.Widget.gtk_key_press_event(Widget.java:763) at org.eclipse.swt.widgets.Control.gtk_key_press_event(Control.java:3325) at org.eclipse.swt.widgets.Composite.gtk_key_press_event(Composite.java:793) at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:1980) at org.eclipse.swt.widgets.Control.windowProc(Control.java:5685) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4717) at org.eclipse.swt.internal.gtk.OS._gtk_main_do_event(Native Method) at org.eclipse.swt.internal.gtk.OS.gtk_main_do_event(OS.java:9326) at org.eclipse.swt.widgets.Display.eventProc(Display.java:1225) at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native Method) at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(OS.java:2435) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3428) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1127) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1018) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:156) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:694) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:606) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:139) 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:380) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235) 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:497) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608) at org.eclipse.equinox.launcher.Main.run(Main.java:1515) at org.eclipse.equinox.launcher.Main.main(Main.java:1488) The workspace lock was held by a thread that was refreshing the workspace.
*** This bug has been marked as a duplicate of bug 384473 ***
(In reply to Dani Megert from comment #1) Dani, do you realize that bug 384473 is closed as WORKSFORME, but this bug is still affecting users of the latest Eclipse version?