Java 如何解决小部件处理的异常？

在我看来，当窗口打开时，我有一个选择侦听器。（视图获取选定项目并根据该项目显示一些数据）

关闭并重新打开视图时会发生异常。当在另一个窗口中更改选择时更新视图的功能可以工作，但在重新打开视图后视图不会更新

我有一个带有setText方法的标签，它给了我这个小部件处理的异常

这是一个选择侦听器问题吗？释放视图时，是否需要删除执行期间创建的所有侦听器

编辑：

选择侦听器代码：

添加选择侦听器的函数：

堆栈跟踪：

选择侦听器放置在createPartControl中

此线路上出现问题：

projectNameLabel.setText("Project: "+projectName);

---

在视图零件中添加选择侦听器时，必须在视图关闭时删除该侦听器。比如：

public classs MyView extends ViewPart
{
  private ISelectionListener myListener;

  @Override
  public void createPartControl(final Composite parent)
  {
    myListener = .... create listener

    ISelectionService selService = ... get selection serivce

    selService.addSelectionListener(myListener);
  }


  @Override
  public void dispose()
  {
    if (myListener != null)
     {
       ISelectionService selService = ... get selection serivce

       selService.removeSelectionListener(myListener);

       myListener = null;
     }

    super.dispose();
  }
}

---

TabViewer第260行在哪里？我已经添加了projectNameLabel.setText（“项目：+projectName”）；在editSo的末尾，其中声明了

projectnamelab

。它是在视图中还是在编辑器中还是在其他地方？无论它是什么，都已明确关闭。它在createpartcontrol方法的视图中声明。在视图关闭时，听起来您没有删除在视图中设置的选择侦听器。如果在视图

createPartControl

中执行

addSelectionListener

，则必须在视图

dispose

中执行相应的

removeSelectionListener

。

org.eclipse.swt.SWTException: Widget is disposed
    at org.eclipse.swt.SWT.error(SWT.java:4361)
    at org.eclipse.swt.SWT.error(SWT.java:4276)
    at org.eclipse.swt.SWT.error(SWT.java:4247)
    at org.eclipse.swt.widgets.Widget.error(Widget.java:468)
    at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:340)
    at org.eclipse.swt.widgets.Label.setText(Label.java:386)
    at com.warnings.compilation.views.TabViewer$2.selectionChanged(TabViewer.java:260)
    at org.eclipse.ui.internal.AbstractPartSelectionTracker$1.run(AbstractPartSelectionTracker.java:119)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.core.runtime.Platform.run(Platform.java:857)
    at org.eclipse.ui.internal.AbstractPartSelectionTracker.fireSelection(AbstractPartSelectionTracker.java:117)
    at org.eclipse.ui.internal.WindowPartSelectionTracker$1.selectionChanged(WindowPartSelectionTracker.java:38)
    at org.eclipse.ui.internal.AbstractPartSelectionTracker$1.run(AbstractPartSelectionTracker.java:119)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.core.runtime.Platform.run(Platform.java:857)
    at org.eclipse.ui.internal.AbstractPartSelectionTracker.fireSelection(AbstractPartSelectionTracker.java:117)
    at org.eclipse.ui.internal.PagePartSelectionTracker$1.selectionChanged(PagePartSelectionTracker.java:49)
    at org.eclipse.jface.viewers.Viewer$2.run(Viewer.java:164)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)
    at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
    at org.eclipse.jface.viewers.Viewer.fireSelectionChanged(Viewer.java:162)
    at org.eclipse.jface.viewers.StructuredViewer.updateSelection(StructuredViewer.java:2188)
    at org.eclipse.jface.viewers.StructuredViewer.handleSelect(StructuredViewer.java:1211)
    at org.eclipse.jface.viewers.StructuredViewer$4.widgetSelected(StructuredViewer.java:1241)
    at org.eclipse.jface.util.OpenStrategy.fireSelectionEvent(OpenStrategy.java:239)
    at org.eclipse.jface.util.OpenStrategy.access$4(OpenStrategy.java:233)
    at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:403)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4169)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3758)
    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:124)
    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:353)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
    at org.eclipse.equinox.launcher.Main.main(Main.java:1414)

projectNameLabel.setText("Project: "+projectName);

public classs MyView extends ViewPart
{
  private ISelectionListener myListener;

  @Override
  public void createPartControl(final Composite parent)
  {
    myListener = .... create listener

    ISelectionService selService = ... get selection serivce

    selService.addSelectionListener(myListener);
  }


  @Override
  public void dispose()
  {
    if (myListener != null)
     {
       ISelectionService selService = ... get selection serivce

       selService.removeSelectionListener(myListener);

       myListener = null;
     }

    super.dispose();
  }
}