添加接缝 2 设置错误

Question

我正在使用带有最新 JBoss 工具的 Eclipse Indigo。 对于现有的 Seam 2 项目，我无法将 Seam 2 设置应用于任何 Seam 项目（主 Seam 项目，ejb）。

每当我尝试将接缝设置设置为已知的接缝运行时，我都会得到以下空指针：

java.lang.NullPointerException
    at org.eclipse.core.internal.resources.ProjectDescription.setBuildSpec(ProjectDescription.java:569)
    at org.jboss.tools.jst.web.WebModelPlugin.addNatureToProjectWithValidationSupport(WebModelPlugin.java:206)
    at org.jboss.tools.seam.core.SeamUtil.enableSeamSupport(SeamUtil.java:57)
    at org.jboss.tools.seam.ui.preferences.SeamSettingsPreferencePage.performOk(SeamSettingsPreferencePage.java:759)
    at org.eclipse.jface.preference.PreferenceDialog$13.run(PreferenceDialog.java:964)
    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.okPressed(PreferenceDialog.java:944)
    at org.eclipse.ui.internal.dialogs.FilteredPreferenceDialog.okPressed(FilteredPreferenceDialog.java:447)
    at org.eclipse.jface.preference.PreferenceDialog.buttonPressed(PreferenceDialog.java:233)
    at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:624)
    at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240)
    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.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: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 org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)
    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)

Answer 1

我解决了这个问题，但我从未找到根本原因。

我使用了一个我知道有效的版本，并将 .classpath 和 .project 文件复制到了有问题的项目中。不是最好的解决方案，但它确实有效。在比较这两个项目时，我无法在首选项中手动操作，因为它们完全相同（除了代码库更改）。

Answer 2

对我来说，我能够解决这个问题，将 buildSpec 和 Nature 标签添加到 .project 文件，然后重新启动 eclipse。

<buildCommand>
    <name>org.jboss.tools.seam.core.seambuilder</name>
    <arguments>
    </arguments>
</buildCommand>
    ...
<natures>
    <nature>org.jboss.tools.seam.core.seamnature</nature>
</natures>