This error is logged when eclipse is closed:

!SESSION 2012-03-23 16:52:33.504 -----------------------------------------------
eclipse.buildId=M20120201-1336
java.version=1.6.0_22
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Framework arguments: -product org.eclipse.epp.package.jee.product
Command-line arguments: -os linux -ws gtk -arch x86_64 -product org.eclipse.epp.package.jee.product

!ENTRY org.eclipse.mylyn.tasks.ui 4 0 2012-03-23 16:52:40.178
!MESSAGE Could not load repository template extension contributed by org.jboss.tools.common.mylyn with connectorKind jira

!ENTRY org.eclipse.ui.workbench 4 0 2012-03-23 17:05:38.899
!MESSAGE Widget disposed too early for part org.jboss.tools.central.editors.JBossCentralEditor
!STACK 0
java.lang.RuntimeException: Widget disposed too early for part org.jboss.tools.central.editors.JBossCentralEditor
at org.eclipse.ui.internal.WorkbenchPartReference$1.widgetDisposed(WorkbenchPartReference.java:171)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:123)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1258)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1282)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1263)
at org.eclipse.swt.widgets.Widget.release(Widget.java:1080)
at org.eclipse.swt.widgets.Control.release(Control.java:3488)
at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:1294)
at org.eclipse.swt.widgets.Widget.release(Widget.java:1083)
at org.eclipse.swt.widgets.Control.release(Control.java:3488)
at org.eclipse.swt.widgets.Widget.dispose(Widget.java:462)
at org.eclipse.ui.internal.EditorSashContainer.disposeParent(EditorSashContainer.java:195)
at org.eclipse.ui.internal.PartSashContainer.dispose(PartSashContainer.java:599)
at org.eclipse.ui.internal.EditorSashContainer.dispose(EditorSashContainer.java:187)
at org.eclipse.ui.internal.EditorAreaHelper.dispose(EditorAreaHelper.java:125)
at org.eclipse.ui.internal.WorkbenchPage.dispose(WorkbenchPage.java:1898)
at org.eclipse.ui.internal.WorkbenchWindow.closeAllPages(WorkbenchWindow.java:894)
at org.eclipse.ui.internal.WorkbenchWindow.hardClose(WorkbenchWindow.java:1729)
at org.eclipse.ui.internal.WorkbenchWindow.busyClose(WorkbenchWindow.java:730)
at org.eclipse.ui.internal.WorkbenchWindow.access$0(WorkbenchWindow.java:715)
at org.eclipse.ui.internal.WorkbenchWindow$6.run(WorkbenchWindow.java:867)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ui.internal.WorkbenchWindow.close(WorkbenchWindow.java:865)
at org.eclipse.jface.window.WindowManager.close(WindowManager.java:109)
at org.eclipse.ui.internal.Workbench$18.run(Workbench.java:1114)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.ui.internal.Workbench.busyClose(Workbench.java:1111)
at org.eclipse.ui.internal.Workbench.access$15(Workbench.java:1040)
at org.eclipse.ui.internal.Workbench$25.run(Workbench.java:1284)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ui.internal.Workbench.close(Workbench.java:1282)
at org.eclipse.ui.internal.Workbench.close(Workbench.java:1254)
at org.eclipse.ui.internal.handlers.QuitHandler.execute(QuitHandler.java:41)
at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:293)
at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)
at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169)
at org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommand(SlaveHandlerService.java:241)
at org.eclipse.ui.internal.actions.CommandAction.runWithEvent(CommandAction.java:157)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)
at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1258)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3588)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3209)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
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:344)
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:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
at org.eclipse.equinox.launcher.Main.main(Main.java:1386)