在做RCP的eclipse插件开发时，启动管理软件界面时，总是报如下错误 ：
!ENTRY org.eclipse.ui.workbench 4 0 2012-05-25 18:44:21.306 !MESSAGE WARNING: Prevented recursive attempt to activate part org.gluster.storage.management.console.views.ClusterSummaryView while still in the middle of activating part org.gluster.storage.management.console.views.NavigationView !STACK 0 java.lang.RuntimeException: WARNING: Prevented recursive attempt to activate part org.gluster.storage.management.console.views.ClusterSummaryView while still in the middle of activating part org.gluster.storage.management.console.views.NavigationView at org.eclipse.ui.internal.WorkbenchPage.setActivePart(WorkbenchPage.java:3586) at org.eclipse.ui.internal.WorkbenchPage.internalActivate(WorkbenchPage.java:691) at org.eclipse.ui.internal.WorkbenchPage.activate(WorkbenchPage.java:663) at org.eclipse.ui.internal.WorkbenchPage.busyShowView(WorkbenchPage.java:1170) at org.eclipse.ui.internal.WorkbenchPage.busyShowView(WorkbenchPage.java:1147) at org.eclipse.ui.internal.WorkbenchPage$20.run(WorkbenchPage.java:3921) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.internal.WorkbenchPage.showView(WorkbenchPage.java:3918) at org.eclipse.ui.internal.WorkbenchPage.showView(WorkbenchPage.java:3894) at org.gluster.storage.management.console.views.GlusterViewsManager.showViewsForCluster(GlusterViewsManager.java:82) at org.gluster.storage.management.console.views.GlusterViewsManager.updateViews(GlusterViewsManager.java:53) at org.gluster.storage.management.console.views.NavigationView.selectionChanged(NavigationView.java:142) at org.eclipse.ui.internal.AbstractSelectionService.fireSelection(AbstractSelectionService.java:156) at org.eclipse.ui.internal.AbstractSelectionService.setActivePart(AbstractSelectionService.java:282) at org.eclipse.ui.internal.WorkbenchPagePartList.fireActivePartChanged(WorkbenchPagePartList.java:60) at org.eclipse.ui.internal.PartList.setActivePart(PartList.java:136) at org.eclipse.ui.internal.WorkbenchPage.setActivePart(WorkbenchPage.java:3636) at org.eclipse.ui.internal.WorkbenchPage.internalActivate(WorkbenchPage.java:691) at org.eclipse.ui.internal.WorkbenchPage.activate(WorkbenchPage.java:663) at org.eclipse.ui.internal.WorkbenchPage.makeActive(WorkbenchPage.java:1324) at org.eclipse.ui.internal.WorkbenchPage.updateActivePart(WorkbenchPage.java:1304) at org.eclipse.ui.internal.WorkbenchPage.updateVisibility(WorkbenchPage.java:3779) at org.eclipse.ui.internal.WorkbenchPage.onActivate(WorkbenchPage.java:2715) at org.eclipse.ui.internal.WorkbenchWindow$27.run(WorkbenchWindow.java:3023) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.internal.WorkbenchWindow.setActivePage(WorkbenchWindow.java:3004) at org.eclipse.ui.internal.WorkbenchWindow.busyOpenPage(WorkbenchWindow.java:799) at org.eclipse.ui.internal.Workbench$23.runWithException(Workbench.java:1224) at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3563) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3212) at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803) at org.eclipse.ui.internal.Workbench$33.runWithException(Workbench.java:1595) at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3563) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3212) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.gluster.storage.management.console.Application.start(Application.java:100) 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:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) 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)
之前一直不知道错误原因，在网上查了一下，解决办法有几个 ，
1.New focus event is run while other focus event was executing and therefore not finished yet.
You have to override setFocus() or find a good place and put this inside your code:
Display.getDefault().asyncExec(new Runnable() {
@Override
public void run() {
while (Display.getDefault().readAndDispatch()) {
//wait for events to finish before continue
}
// your code for focus here
// e.g. table.forceFocus()
}
});
So Display will wait until current focus event is finish, and then will execute new focus event.
根据我的测试，上面的代码中，去掉
while (Display.getDefault().readAndDispatch()) {
//wait for events to finish before continue
}
这段也是一样可以的
2. I just found that one of my colleagues add a PartListener to the part service. When an activated part was adaptable to the IContentOutlinePage, the listener activates the ContentOutline view, so it get also the focus. This was the reason of the exception.