Could not open the editor: An unexpected exception was thrown.错误

错误提示：

        Could not open the editor: An unexpected exception was thrown.

 

java.lang.NullPointerException
	at com.genuitec.eclipse.struts2.model.di.Struts2DIModeBuilder.createWebResourceNode(Struts2DIModeBuilder.java:209)
	at com.genuitec.eclipse.struts2.model.di.Struts2DIModelBuilder2.createWebResourceNode(Struts2DIModelBuilder2.java:76)
	at com.genuitec.eclipse.struts2.model.di.Struts2DIModeBuilder.updateDiagram(Struts2DIModeBuilder.java:150)
	at com.genuitec.eclipse.struts2.model.di.Struts2DIModelBuilder2.updateDiagram(Struts2DIModelBuilder2.java:253)
	at com.genuitec.eclipse.struts2.editor.Struts2Editor.loadInput(Struts2Editor.java:471)
	at com.genuitec.eclipse.struts2.editor.Struts2Editor.reloadInput(Struts2Editor.java:490)
	at com.genuitec.eclipse.struts2.editor.Struts2ConfigEditor.pageChange(Struts2ConfigEditor.java:100)
	at org.eclipse.ui.part.MultiPageEditorPart.setActivePage(MultiPageEditorPart.java:1076)
	at com.genuitec.eclipse.struts2.editor.Struts2ConfigEditor.createPages(Struts2ConfigEditor.java:50)
	at org.eclipse.ui.part.MultiPageEditorPart.createPartControl(MultiPageEditorPart.java:357)
	at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:662)
	at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:462)
	at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
	at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:313)
	at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:180)
	at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:270)
	at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)
	at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:473)
	at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1256)
	at org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:1209)
	at org.eclipse.ui.internal.PartStack.showPart(PartStack.java:1608)
	at org.eclipse.ui.internal.PartStack.add(PartStack.java:499)
	at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:103)
	at org.eclipse.ui.internal.PartStack.add(PartStack.java:485)
	at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:112)
	at org.eclipse.ui.internal.EditorSashContainer.addEditor(EditorSashContainer.java:63)
	at org.eclipse.ui.internal.EditorAreaHelper.addToLayout(EditorAreaHelper.java:225)
	at org.eclipse.ui.internal.EditorAreaHelper.addEditor(EditorAreaHelper.java:213)
	at org.eclipse.ui.internal.EditorManager.createEditorTab(EditorManager.java:778)
	at org.eclipse.ui.internal.EditorManager.openEditorFromDescriptor(EditorManager.java:677)
	at org.eclipse.ui.internal.EditorManager.openEditor(EditorManager.java:638)
	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2854)
	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2762)
	at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2754)
	at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2705)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2701)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2685)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2676)
	at org.eclipse.ui.ide.IDE.openEditor(IDE.java:651)
	at org.eclipse.ui.ide.IDE.openEditor(IDE.java:610)
	at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:361)
	at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:168)
	at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:229)
	at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:208)
	at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:274)
	at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:250)
	at org.eclipse.jdt.internal.ui.packageview.PackageExplorerActionGroup.handleOpen(PackageExplorerActionGroup.java:373)
	at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$4.open(PackageExplorerPart.java:526)
	at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.open(OpenAndLinkWithEditorHelper.java:48)
	at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:842)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.core.runtime.Platform.run(Platform.java:888)
	at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)
	at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
	at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:840)
	at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1101)
	at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1205)
	at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:264)
	at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:258)
	at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:298)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3910)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3503)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
	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:368)
	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:559)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1311)

 

出错原因：

        出现这个异常好像是跟打开struts配置文件的插件有关，它每次操作完xml后，好像会生成一个同名的.mex的文件，一般报这个错误就是跟这个文件有关，我们用cvs或者svn提交的时候，就会看到这个文件也会提示提交。

 

解决办法：

        这边就有两种解决方案，第一种，选中要打开的xml，右键--> open with -->myeclipse xml editor；第二种，关闭myeclipse，打开项目的物理目录，找到与xml同名的.mex文件，删除掉，启动MyEclipse，然后双击，或者右键，选择用“MyEclipse Struts Config Editor”打开struts-config.xml文件，会弹出一个窗口，说找不到文件“.struts-config.mex”，问是否创建，点击“OK”按钮。