EMF不能載入schema問題的解決

在EMF裡可以用XML Schema定義模型，然後轉換為genmodel模型，但我這裡在生成genmodel向導的第四步按Load後會産生一個NullPointerException如下，導緻無法繼續：

java.lang.NullPointerException

    at org.apache.crimson.tree.ElementNode2.getAttributeNodeNS(ElementNode2.java:432)

    at org.apache.crimson.tree.ElementNode2.hasAttributeNS(ElementNode2.java:388)

    at org.eclipse.xsd.ecore.XSDEcoreBuilder.getEcoreAttribute(XSDEcoreBuilder.java:2336)

    at org.eclipse.xsd.ecore.XSDEcoreBuilder.getEcoreAttribute(XSDEcoreBuilder.java:2329)

    at org.eclipse.xsd.ecore.XSDEcoreBuilder.getEStructuralFeature(XSDEcoreBuilder.java:2004)

    at org.eclipse.xsd.ecore.XSDEcoreBuilder.generate(XSDEcoreBuilder.java:2117)

    at org.eclipse.xsd.ecore.XSDEcoreBuilder.generate(XSDEcoreBuilder.java:2067)

    at org.eclipse.xsd.ecore.importer.XSDImporter.doComputeEPackages(XSDImporter.java:123)

    at org.eclipse.emf.importer.ModelImporter.computeEPackages(ModelImporter.java:664)

    at org.eclipse.emf.importer.ui.contribution.base.ModelDetailPage.refreshModel(ModelDetailPage.java:488)

    at org.eclipse.emf.importer.ui.contribution.base.ModelDetailPage$2.execute(ModelDetailPage.java:434)

    at org.eclipse.ui.actions.WorkspaceModifyOperation$1.run(WorkspaceModifyOperation.java:98)

    at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1719)

    at org.eclipse.ui.actions.WorkspaceModifyOperation.run(WorkspaceModifyOperation.java:110)

    at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:346)

    at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:291)

    at org.eclipse.jface.wizard.WizardDialog.run(WizardDialog.java:830)

    at org.eclipse.emf.importer.ui.contribution.base.ModelDetailPage.refreshModel(ModelDetailPage.java:457)

    at org.eclipse.emf.importer.ui.contribution.base.ModelDetailPage.doHandleEvent(ModelDetailPage.java:241)

    at org.eclipse.xsd.ecore.importer.ui.XSDDetailPage.doHandleEvent(XSDDetailPage.java:91)

    at org.eclipse.emf.importer.ui.contribution.base.ModelImporterPage.handleEvent(ModelImporterPage.java:106)

    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)

    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1021)

    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2867)

    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2572)

    at org.eclipse.jface.window.Window.runEventLoop(Window.java:809)

    at org.eclipse.jface.window.Window.open(Window.java:787)

    at org.eclipse.ui.actions.NewWizardAction.run(NewWizardAction.java:181)

    at org.eclipse.ui.actions.NewWizardDropDownAction.run(NewWizardDropDownAction.java:174)

    at org.eclipse.jface.action.Action.runWithEvent(Action.java:996)

    at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:538)

    at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:488)

    at org.eclipse.jface.action.ActionContributionItem$6.handleEvent(ActionContributionItem.java:441)

    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1699)

    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1663)

    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:367)

    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:143)

    at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:103)

    at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:226)

    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:376)

    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:163)

    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:324)

    at org.eclipse.core.launcher.Main.invokeFramework(Main.java:334)

    at org.eclipse.core.launcher.Main.basicRun(Main.java:278)

    at org.eclipse.core.launcher.Main.run(Main.java:973)

    at org.eclipse.core.launcher.Main.main(Main.java:948)