eclipse问题！
在导入完一个spring+struts项目后
spring的applicationContext.xml打不开
别的文件都可以。改个名字以后就可以打开了applicationContext-basic.xml
请问是什么问题？
请知道的指点下。具体错误信息：

Unable   to   create   this   part   due   to   an   internal   error.   Reason   for   the   failure:   An   unexpected   exception   was   thrown.

java.lang.NullPointerException
at   org.eclipse.wst.sse.ui.StructuredTextEditor.update(StructuredTextEditor.java:3055)
at   org.eclipse.wst.xml.ui.internal.tabletree.XMLMultiPageEditorPart.addSourcePage(XMLMultiPageEditorPart.java:338)
at   org.eclipse.wst.xml.ui.internal.tabletree.XMLMultiPageEditorPart.createPages(XMLMultiPageEditorPart.java:505)
at   org.eclipse.ui.part.MultiPageEditorPart.createPartControl(MultiPageEditorPart.java:276)
at   org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:596)
at   org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:372)
at   org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:566)
at   org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:290)
at   org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:140)
at   org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:268)
at   org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)
at   org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:394)
at   org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1144)
at   org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:1097)
at   org.eclipse.ui.internal.PartStack.showPart(PartStack.java:1311)
at   org.eclipse.ui.internal.PartStack.add(PartStack.java:455)
at   org.eclipse.ui.internal.EditorStack.add(EditorStack.java:102)
at   org.eclipse.ui.internal.PartStack.add(PartStack.java:441)
at   org.eclipse.ui.internal.EditorStack.add(EditorStack.java:111)
at   org.eclipse.ui.internal.EditorSashContainer.addEditor(EditorSashContainer.java:60)
at   org.eclipse.ui.internal.EditorAreaHelper.addToLayout(EditorAreaHelper.java:217)
at   org.eclipse.ui.internal.EditorAreaHelper.addEditor(EditorAreaHelper.java:207)
at   org.eclipse.ui.internal.EditorManager.createEditorTab(EditorManager.java:822)
at   org.eclipse.ui.internal.EditorManager.openEditorFromDescriptor(EditorManager.java:721)
at   org.eclipse.ui.internal.EditorManager.openEditor(EditorManager.java:682)
at   org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2593)
at   org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2528)
at   org.eclipse.ui.internal.WorkbenchPage.access$10(WorkbenchPage.java:2520)
at   org.eclipse.ui.internal.WorkbenchPage$9.run(WorkbenchPage.java:2505)
at   org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
at   org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2500)
at   org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2485)
at   org.eclipse.ui.ide.IDE.openEditor(IDE.java:388)
at   org.eclipse.ui.ide.IDE.openEditor(IDE.java:350)
at   org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:275)
at   org.eclipse.jdt.internal.ui.