org.eclipse.swt.SWTException：来自 HandledContributionItem 的无效线程访问

Question

我知道这里有很多这样的问题，而且大部分都得到了回答。但答案并不能解决我的问题。

我正在开发一个 eclipse 插件项目，有一个自定义项目类型，可以运行或调试。我已经实现了运行和调试功能，我期望的一切都显示在屏幕上，除了控制台显示异常：

!ENTRY org.eclipse.e4.ui.workbench 4 0 2015-04-28 23:31:17.410
!MESSAGE Internal error during tool item enablement updating, this is only       logged once per tool item.
!STACK 0
org.eclipse.swt.SWTException: Invalid thread access
at org.eclipse.swt.SWT.error(SWT.java:4441)
at org.eclipse.swt.SWT.error(SWT.java:4356)
at org.eclipse.swt.SWT.error(SWT.java:4327)
at org.eclipse.swt.widgets.Widget.error(Widget.java:783)
at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:574)
at org.eclipse.swt.widgets.Widget.getData(Widget.java:874)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.updateIcons(HandledContributionItem.java:546)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.update(HandledContributionItem.java:440)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.update(HandledContributionItem.java:430)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.run(HandledContributionItem.java:168)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.updateItemEnablement(HandledContributionItem.java:196)
at org.eclipse.e4.ui.workbench.renderers.swt.ToolItemUpdater.updateContributionItems(ToolItemUpdater.java:39)
at org.eclipse.e4.ui.workbench.renderers.swt.ToolBarManagerRenderer.changed(ToolBarManagerRenderer.java:367)
at org.eclipse.e4.core.internal.contexts.TrackableComputationExt.update(TrackableComputationExt.java:110)
at org.eclipse.e4.core.internal.contexts.EclipseContext.processScheduled(EclipseContext.java:338)
at org.eclipse.e4.core.internal.contexts.EclipseContext.set(EclipseContext.java:352)
at org.eclipse.ui.internal.services.EvaluationService.contextEvaluate(EvaluationService.java:139)
at org.eclipse.ui.internal.services.EvaluationService.addSourceProvider(EvaluationService.java:180)
at org.eclipse.debug.internal.ui.contexts.DebugContextSourceProvider.<init>(DebugContextSourceProvider.java:51)
at org.eclipse.debug.internal.ui.contexts.DebugWindowContextService.<init>(DebugWindowContextService.java:62)
at org.eclipse.debug.internal.ui.contexts.DebugContextManager.createService(DebugContextManager.java:163)
at org.eclipse.debug.internal.ui.contexts.DebugContextManager.getContextService(DebugContextManager.java:221)
at org.eclipse.debug.internal.ui.views.ViewContextService.<init>(ViewContextService.java:620)
at org.eclipse.debug.internal.ui.views.ViewContextManager.windowOpened(ViewContextManager.java:93)
at org.eclipse.debug.internal.ui.views.ViewContextManager.<init>(ViewContextManager.java:55)
at org.eclipse.debug.internal.ui.views.ViewContextManager.getDefault(ViewContextManager.java:44)
at org.eclipse.debug.internal.ui.contexts.DebugContextManager.getDefault(DebugContextManager.java:150)
at org.eclipse.debug.ui.DebugUITools.getDebugContextManager(DebugUITools.java:1068)
at org.eclipse.debug.internal.ui.sourcelookup.SourceLookupService.<init>(SourceLookupService.java:40)
at org.eclipse.debug.internal.ui.sourcelookup.SourceLookupManager.windowOpened(SourceLookupManager.java:91)
at org.eclipse.debug.internal.ui.sourcelookup.SourceLookupManager.<init>(SourceLookupManager.java:41)
at org.eclipse.debug.internal.ui.sourcelookup.SourceLookupManager.getDefault(SourceLookupManager.java:53)
at org.eclipse.debug.internal.ui.DebugUIPlugin.initializeLaunchListeners(DebugUIPlugin.java:935)
at org.eclipse.debug.internal.ui.DebugUIPlugin.launchAdded(DebugUIPlugin.java:920)
at org.eclipse.debug.internal.core.LaunchManager$LaunchNotifier.run(LaunchManager.java:451)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.debug.internal.core.LaunchManager$LaunchNotifier.notify(LaunchManager.java:438)
at org.eclipse.debug.internal.core.LaunchManager.fireUpdate(LaunchManager.java:1044)
at org.eclipse.debug.internal.core.LaunchManager.addLaunch(LaunchManager.java:708)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:834)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:739)
at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:1039)
at org.eclipse.debug.internal.ui.DebugUIPlugin.run(DebugUIPlugin.java:1256)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

我的代码如下：在LaunchShortCut.java我有

Display.getDefault().syncExec(new Runnable() {
    @Override
    public void run() {
      Shell activeShell = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell();
      if(DebugUITools.openLaunchConfigurationDialog(activeShell, config, group, null) == Window.CANCEL){
        return;
      }
    }
  });

这会触发 LaunchConfigurationWindow，并且不会在控制台中显示任何异常。当我在这个 window 中点击 "run" 时，进程在我有断点的以下代码的第一行停止，并在控制台中显示异常。

Display.getDefault().syncExec(new Runnable() {
  @Override
  public void run() {
    //clear old output
    HTMLOutput htmloutput = (HTMLOutput) PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().findView("my.view.id");
  }
}

从异常的堆栈跟踪中我没有看到与我的代码相关的任何内容。如果我让程序继续运行ning，一切都很好，我没有看到这个异常导致的任何问题，但我只是想不通它是怎么回事，甚至无法阻止它出现。请帮我解决这个问题。

Answer 1

看来您在 Eclipse 中遇到了错误。 Bug 445560 中描述了相同的堆栈跟踪。此错误报告中描述的解决方法（请参阅评论 4）可能对您的情况也有帮助：

As current local workaround for this issue I've added in our rcp code an early call to DebugUITools.getDebugContextManager() from the UI thread. Ugly, and should not be needed, but it avoids the failures seen when launching for the first time.

org.eclipse.swt.SWTException：来自 HandledContributionItem 的无效线程访问

org.eclipse.swt.SWTException: Invalid thread access from HandledContributionItem

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