我在复合中有2个TableViewer控件（假设它们是：viewer1，viewer2）。初始化应用程序时，将一个“ viewer1”从服务器填充数据，而将“ viewer2”设置为空。
viewer1.setInput(getData());
viewer2.setInput(null);
现在，我想通过上下文菜单将某些对象从viewer1更改为viewer2，第一次添加成功，但是下次将对象填充到viewer2时，总是会遇到此异常：
java.lang.UnsupportedOperationException
如果viewer2预先包含一些对象，则不会发生这种情况，只有在viewer2为空时才会发生。
这是我添加的一些方法，将一些数据从viewer1移到viewer2：
//get selected objects in Viewer1
IStructuredSelection selection= (IStructuredSelection) viewer1.getSelection();
if(selection!=null){
selectedList=(List<MyObject>)selection.toList();
for(MyObject obj: selectedList){
//do something here
}
//remove all
((List<MyObject>)viewer1().getInput()).removeAll(selectedList);
viewer1.refresh();
}
//viewer1 get above List
if((List<MyObject>)viewer2.getInput()==null)
viewer2.setInput(selectedList);
else {
((List<MyObject>)viewer2.getInput()).addAll(selectedList); //(Line Error)
}
viewer2.refresh;
第一次在IF条件下运行良好，但是下一次当viewer2包含一些数据时，我总是在上述错误行出现异常。
@Krumelur，我添加了获得的stacktrace：
!ENTRY org.eclipse.ui 4 0 2011-12-27 16:26:50.660
!MESSAGE Unhandled event loop exception
!STACK 0
java.lang.UnsupportedOperationException
at java.util.AbstractList.add(Unknown Source)
at java.util.AbstractList.add(Unknown Source)
at java.util.AbstractCollection.addAll(Unknown Source)
at com.saltlux.om.client.customwidgets.NeutralSetWidget.getReviewFromOtherWidget(NeutralSetWidget.java:39)
at com.saltlux.om.client.customwidgets.NeutralSetWidget$1.handleEvent(NeutralSetWidget.java:24)
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.Widget.sendEvent(Widget.java:1077)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:774)
at com.saltlux.om.client.customwidgets.PositiveSetWidget.add2TrainingSet(PositiveSetWidget.java:107)
at com.saltlux.om.client.customwidgets.TrainingReviewWidget$10.run(TrainingReviewWidget.java:288)
at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
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:1053)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660)
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 com.saltlux.om.client.Application.start(Application.java:21)
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(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: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)
请帮帮我。非常感谢您的回答！
最佳答案
并非java.util.List接口的所有实现都支持addAll()方法。例如，Arrays.asList()返回的那个没有，这就是StructuredSelection.toList()使用的方法。