java 7 - Unhandled loop exception when moving frames around in Eclipse -


if start @ standard java view , move 1 of open programs side (so can see 2 open programs @ once, side side), , click on either of frames,

unhandled event loop exception item not added 

i following in event detail's stack trace -

eclipse.buildid=m20130204-1200 java.version=1.7.0_17 java.vendor=oracle corporation bootloader constants: os=win32, arch=x86_64, ws=win32, nl=en_us framework arguments:  -product org.eclipse.epp.package.jee.product command-line arguments:  -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.jee.product  error sat apr 20 00:36:50 edt 2013 unhandled event loop exception  org.eclipse.swt.swterror: item not added     @ org.eclipse.swt.swt.error(swt.java:4387)     @ org.eclipse.swt.swt.error(swt.java:4276)     @ org.eclipse.swt.swt.error(swt.java:4247)     @ org.eclipse.swt.widgets.widget.error(widget.java:468)     @ org.eclipse.swt.widgets.toolbar.createitem(toolbar.java:392)     @ org.eclipse.swt.widgets.toolitem.<init>(toolitem.java:128)     @ org.eclipse.jface.action.actioncontributionitem.fill(actioncontributionitem.java:332)     @ org.eclipse.jface.action.toolbarmanager.update(toolbarmanager.java:353)     @ org.eclipse.ui.internal.actionsetactionbars.setactive(actionsetactionbars.java:306)     @ org.eclipse.ui.subactionbars.activate(subactionbars.java:151)     @ org.eclipse.ui.subactionbars.activate(subactionbars.java:138)     @ org.eclipse.ui.internal.actionpresentation.setactionsets(actionpresentation.java:141)     @ org.eclipse.ui.internal.workbenchwindow.updateactionsets(workbenchwindow.java:1886)     @ org.eclipse.ui.internal.workbenchpage$actionswitcher.updateactionsets(workbenchpage.java:772)     @ org.eclipse.ui.internal.workbenchpage$actionswitcher.updateactivepart(workbenchpage.java:610)     @ org.eclipse.ui.internal.workbenchpage$actionswitcher.updatetopeditor(workbenchpage.java:637)     @ org.eclipse.ui.internal.workbenchpage.updateactiveeditorsources(workbenchpage.java:348)     @ org.eclipse.ui.internal.workbenchpage.updateactivations(workbenchpage.java:251)     @ org.eclipse.ui.internal.workbenchpage.access$15(workbenchpage.java:243)     @ org.eclipse.ui.internal.workbenchpage$e4partlistener.partactivated(workbenchpage.java:172)     @ org.eclipse.e4.ui.internal.workbench.partserviceimpl$2.run(partserviceimpl.java:193)     @ org.eclipse.core.runtime.saferunner.run(saferunner.java:42)     @ org.eclipse.e4.ui.internal.workbench.partserviceimpl.firepartactivated(partserviceimpl.java:191)     @ org.eclipse.e4.ui.internal.workbench.partserviceimpl.activate(partserviceimpl.java:596)     @ org.eclipse.e4.ui.internal.workbench.partserviceimpl.activate(partserviceimpl.java:549)     @ org.eclipse.e4.ui.internal.workbench.swt.abstractpartrenderer.activate(abstractpartrenderer.java:105)     @ org.eclipse.e4.ui.workbench.renderers.swt.contributedpartrenderer$1.handleevent(contributedpartrenderer.java:61)     @ org.eclipse.swt.widgets.eventtable.sendevent(eventtable.java:84)     @ org.eclipse.swt.widgets.widget.sendevent(widget.java:1053)     @ org.eclipse.swt.widgets.widget.sendevent(widget.java:1077)     @ org.eclipse.swt.widgets.widget.sendevent(widget.java:1058)     @ org.eclipse.swt.widgets.shell.setactivecontrol(shell.java:1447)     @ org.eclipse.swt.widgets.shell.wm_mouseactivate(shell.java:2328)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4572)     @ org.eclipse.swt.widgets.canvas.windowproc(canvas.java:341)     @ org.eclipse.swt.widgets.decorations.windowproc(decorations.java:1627)     @ org.eclipse.swt.widgets.shell.windowproc(shell.java:2069)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.canvas.windowproc(canvas.java:341)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.defwindowprocw(native method)     @ org.eclipse.swt.internal.win32.os.defwindowproc(os.java:2541)     @ org.eclipse.swt.widgets.scrollable.callwindowproc(scrollable.java:80)     @ org.eclipse.swt.widgets.control.windowproc(control.java:4623)     @ org.eclipse.swt.widgets.canvas.windowproc(canvas.java:341)     @ org.eclipse.swt.widgets.display.windowproc(display.java:4989)     @ org.eclipse.swt.internal.win32.os.peekmessagew(native method)     @ org.eclipse.swt.internal.win32.os.peekmessage(os.java:3129)     @ org.eclipse.swt.widgets.display.readanddispatch(display.java:3753)     @ org.eclipse.e4.ui.internal.workbench.swt.partrenderingengine$9.run(partrenderingengine.java:1053)     @ org.eclipse.core.databinding.observable.realm.runwithdefault(realm.java:332)     @ org.eclipse.e4.ui.internal.workbench.swt.partrenderingengine.run(partrenderingengine.java:942)     @ org.eclipse.e4.ui.internal.workbench.e4workbench.createandrunui(e4workbench.java:86)     @ org.eclipse.ui.internal.workbench$5.run(workbench.java:588)     @ org.eclipse.core.databinding.observable.realm.runwithdefault(realm.java:332)     @ org.eclipse.ui.internal.workbench.createandrunworkbench(workbench.java:543)     @ org.eclipse.ui.platformui.createandrunworkbench(platformui.java:149)     @ org.eclipse.ui.internal.ide.application.ideapplication.start(ideapplication.java:124)     @ org.eclipse.equinox.internal.app.eclipseapphandle.run(eclipseapphandle.java:196)     @ org.eclipse.core.runtime.internal.adaptor.eclipseapplauncher.runapplication(eclipseapplauncher.java:110)     @ org.eclipse.core.runtime.internal.adaptor.eclipseapplauncher.start(eclipseapplauncher.java:79)     @ org.eclipse.core.runtime.adaptor.eclipsestarter.run(eclipsestarter.java:353)     @ org.eclipse.core.runtime.adaptor.eclipsestarter.run(eclipsestarter.java:180)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(unknown source)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source)     @ java.lang.reflect.method.invoke(unknown source)     @ org.eclipse.equinox.launcher.main.invokeframework(main.java:629)     @ org.eclipse.equinox.launcher.main.basicrun(main.java:584)     @ org.eclipse.equinox.launcher.main.run(main.java:1438)     @ org.eclipse.equinox.launcher.main.main(main.java:1414) 

why happening , how can fix it? if go single program view @ once seems work fine, want see both @ same time.

duplicate of an-swt-error-has-occurred
more details in eclipse bug# 287508


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