我从 Sourceforge 导入了一个 Java Web 应用程序，我花了三个工作周的时间来消除项目名称和包上附加的所有红叉，但现在我无法使该应用程序在我的 Eclipse 和 tomcat6 开发环境上运行。在项目属性中，当我尝试设置部署程序集时，对话框显示：当前显示的页面包含无效值。在错误日志中，我发现当我单击部署程序集时，显示以下错误消息：
Error
Wed Jan 09 10:25:16 CST 2013
Problems occurred when invoking code from plug-in: "org.eclipse.jface".
java.lang.NullPointerException
at org.eclipse.wst.common.componentcore.internal.resources.VirtualFolder.getFirstTaggedResource(VirtualFolder.java:185)
at org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent.getDefaultDeploymentDescriptorFolder(J2EEModuleVirtualComponent.java:542)
at org.eclipse.jst.j2ee.internal.ui.JavaEEDeploymentAssemblyAdvancedSectionBuilder.(JavaEEDeploymentAssemblyAdvancedSectionBuilder.java:86)
at org.eclipse.jst.j2ee.internal.ui.J2EEModuleDependenciesPropertyPage.getAdvancedSectionBuilder(J2EEModuleDependenciesPropertyPage.java:381)
at org.eclipse.jst.j2ee.internal.ui.J2EEModuleDependenciesPropertyPage.(J2EEModuleDependenciesPropertyPage.java:65)
at org.eclipse.jst.servlet.ui.internal.WebDependencyPropertyPage.(WebDependencyPropertyPage.java:34)
at org.eclipse.jst.servlet.ui.internal.WebModuleDependencyPageProvider.createPages(WebModuleDependencyPageProvider.java:54)
at org.eclipse.wst.common.componentcore.ui.propertypage.ModuleAssemblyRootPage.createContents(ModuleAssemblyRootPage.java:195)
at org.eclipse.jface.preference.PreferencePage.createControl(PreferencePage.java:232)
at org.eclipse.wst.common.componentcore.ui.propertypage.ModuleAssemblyRootPage.createControl(ModuleAssemblyRootPage.java:346)
at org.eclipse.jface.preference.PreferenceDialog.createPageControl(PreferenceDialog.java:1502)
at org.eclipse.jface.preference.PreferenceDialog$14.run(PreferenceDialog.java:1259)
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.preference.PreferenceDialog.showPage(PreferenceDialog.java:1253)
at org.eclipse.ui.internal.dialogs.FilteredPreferenceDialog.showPage(FilteredPreferenceDialog.java:675)
at org.eclipse.jface.preference.PreferenceDialog$10.run(PreferenceDialog.java:709)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.jface.preference.PreferenceDialog$9.selectionChanged(PreferenceDialog.java:705)
at org.eclipse.jface.viewers.StructuredViewer$3.run(StructuredViewer.java:888)
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.StructuredViewer.firePostSelectionChanged(StructuredViewer.java:886)
at org.eclipse.jface.viewers.StructuredViewer.handlePostSelect(StructuredViewer.java:1226)
at org.eclipse.jface.viewers.StructuredViewer$5.widgetSelected(StructuredViewer.java:1251)
at org.eclipse.jface.util.OpenStrategy.firePostSelectionEvent(OpenStrategy.java:262)
at org.eclipse.jface.util.OpenStrategy.access$5(OpenStrategy.java:256)
at org.eclipse.jface.util.OpenStrategy$3.run(OpenStrategy.java:433)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4144)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3761)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
at org.eclipse.jface.window.Window.open(Window.java:801)
at org.eclipse.ui.dialogs.PropertyDialogAction.run(PropertyDialogAction.java:158)
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:4169)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3758)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1022)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:916)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:86)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:585)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:540)
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)
我用谷歌搜索了很多次，但找不到解决方案。任何人都可以帮忙让部署组装工作吗？我认为这是我的应用程序无法运行的关键。提前致谢。
eclipse -clean 没有为我修复它。我的解决方法：在 Eclipse 中删除项目（不要在磁盘上删除）。然后在文件系统中删除 .project .classpath 和 .settings/* 然后在 eclipse 中，同一工作区，创建与旧项目同名的新 web 项目。它创建了该项目并找到了我的所有来源。现在部署程序集又可以工作了！之后，我更新了构建路径以获得正确的项目和库依赖项。
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