java - 启动时出现 Eclipse 错误 : Error notifying a preference change listener

Question

每天当我启动 Eclipse 时，我都会收到以下错误:

An error has occured. See error log for more details.

Error notifying a preference change listener. Check the log for details.

Error notifying a preference change listener. Check the log for details. java.lang.NullPointerException

知道是什么原因造成的吗？

当我重新启动 Eclipse 时，我不再收到错误，但每当我收到此错误时，我都必须重新编译我的代码库。它可能连接也可能不连接。好像是，但我还不知道。

编辑 1:

以下是来自 \workspace\.metadata\.log 的错误日志的两个小节:

日志的开头:

!SESSION 2011-11-30 10:22:09.734 -----------------------------------------------
eclipse.buildId=I20110613-1736
java.version=1.7.0
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US
Framework arguments:  -product org.eclipse.epp.package.jee.product
Command-line arguments:  -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.jee.product

!ENTRY org.eclipse.osgi 2 0 2011-11-30 10:24:59.186
!MESSAGE While loading class "org.eclipse.m2e.jdt.internal.MavenClasspathVariableInitializer", thread "Thread[main,6,main]" timed out waiting (5007ms) for thread "Thread[org.eclipse.jdt.internal.ui.text.JavaReconciler,1,main]" to finish starting bundle "org.eclipse.m2e.jdt_1.0.100.20110804-1717 [491]". To avoid deadlock, thread "Thread[main,6,main]" is proceeding but "org.eclipse.m2e.jdt.internal.MavenClasspathVariableInitializer" may not be fully initialized.
!STACK 0
org.osgi.framework.BundleException: State change in progress for bundle "reference:file:plugins/org.eclipse.m2e.jdt_1.0.100.20110804-1717.jar" by thread "org.eclipse.jdt.internal.ui.text.JavaReconciler".
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.beginStateChange(AbstractBundle.java:1087)
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:297)
    at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:440)
    at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:268)
    at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:107)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:462)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
    at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:400)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:476)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at org.eclipse.osgi.internal.loader.BundleLoader.loadClass(BundleLoader.java:345)
    at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:229)
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1207)
    at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:174)
    at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905)
    at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
    at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55)
    at org.eclipse.jdt.core.JavaCore.getClasspathVariableInitializer(JavaCore.java:3034)
    at org.eclipse.jdt.core.JavaCore.getClasspathVariable(JavaCore.java:2897)
    at org.eclipse.jdt.internal.core.JavaModelManager.getResolvedVariablePath(JavaModelManager.java:2549)
    at org.eclipse.jdt.internal.core.JavaModelManager.resolveVariableEntry(JavaModelManager.java:2469)
    at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2645)
    at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2838)
    at org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath(JavaProject.java:1943)
    at org.eclipse.jdt.internal.core.JavaProject.buildStructure(JavaProject.java:461)
    at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:258)
    at org.eclipse.jdt.internal.core.Openable.openAncestors(Openable.java:504)
    at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:240)
    at org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:518)
    at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:255)
    at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:241)
    at org.eclipse.jdt.internal.core.PackageFragmentRoot.getKind(PackageFragmentRoot.java:477)
    at org.eclipse.jdt.internal.core.PackageFragment.getKind(PackageFragment.java:290)
    at org.eclipse.jdt.internal.core.PackageFragment.validateExistence(PackageFragment.java:506)
    at org.eclipse.jdt.internal.core.Openable.exists(Openable.java:206)
    at org.eclipse.jdt.internal.core.PackageFragment.exists(PackageFragment.java:174)
    at org.eclipse.jdt.ui.StandardJavaElementContentProvider.exists(StandardJavaElementContentProvider.java:451)
    at org.eclipse.jdt.ui.StandardJavaElementContentProvider.getParent(StandardJavaElementContentProvider.java:249)
    at org.eclipse.jdt.internal.ui.javaeditor.JavaEditorBreadcrumb$JavaEditorBreadcrumbContentProvider.getParent(JavaEditorBreadcrumb.java:333)
    at org.eclipse.jdt.internal.ui.javaeditor.breadcrumb.BreadcrumbViewer.buildItemChain(BreadcrumbViewer.java:608)
    at org.eclipse.jdt.internal.ui.javaeditor.breadcrumb.BreadcrumbViewer.buildItemChain(BreadcrumbViewer.java:610)
    at org.eclipse.jdt.internal.ui.javaeditor.breadcrumb.BreadcrumbViewer.inputChanged(BreadcrumbViewer.java:306)
    at org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:280)
    at org.eclipse.jface.viewers.StructuredViewer.setInput(StructuredViewer.java:1690)
    at org.eclipse.jdt.internal.ui.javaeditor.breadcrumb.EditorBreadcrumb.setInput(EditorBreadcrumb.java:169)
    at org.eclipse.jdt.internal.ui.javaeditor.JavaEditorBreadcrumb.setInput(JavaEditorBreadcrumb.java:788)
    at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.setBreadcrumbInput(JavaEditor.java:2007)
    at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.showBreadcrumb(JavaEditor.java:1981)
    at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.handlePreferenceStoreChanged(JavaEditor.java:2883)
    at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor.handlePreferenceStoreChanged(CompilationUnitEditor.java:1620)
    at org.eclipse.ui.texteditor.AbstractTextEditor$PropertyChangeListener.propertyChange(AbstractTextEditor.java:710)
    at org.eclipse.ui.texteditor.ChainedPreferenceStore.firePropertyChangeEvent(ChainedPreferenceStore.java:164)
    at org.eclipse.ui.texteditor.ChainedPreferenceStore.handlePropertyChangeEvent(ChainedPreferenceStore.java:431)
    at org.eclipse.ui.texteditor.ChainedPreferenceStore.access$0(ChainedPreferenceStore.java:408)
    at org.eclipse.ui.texteditor.ChainedPreferenceStore$PropertyChangeListener.propertyChange(ChainedPreferenceStore.java:69)
    at org.eclipse.ui.preferences.ScopedPreferenceStore$3.run(ScopedPreferenceStore.java:375)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.ui.preferences.ScopedPreferenceStore.firePropertyChangeEvent(ScopedPreferenceStore.java:372)
    at org.eclipse.jdt.internal.ui.javaeditor.ToggleBreadcrumbAction.perspectiveActivated(ToggleBreadcrumbAction.java:135)
    at org.eclipse.ui.internal.PerspectiveListenerList$1.run(PerspectiveListenerList.java:74)
    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.PerspectiveListenerList.fireEvent(PerspectiveListenerList.java:58)
    at org.eclipse.ui.internal.PerspectiveListenerList.firePerspectiveActivated(PerspectiveListenerList.java:72)
    at org.eclipse.ui.internal.WorkbenchWindow.firePerspectiveActivated(WorkbenchWindow.java:1450)
    at org.eclipse.ui.internal.WorkbenchPage$18.runWithException(WorkbenchPage.java:3350)
    at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
    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:4140)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3757)
    at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803)
    at org.eclipse.ui.internal.Workbench$33.runWithException(Workbench.java:1595)
    at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
    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:4140)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3757)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494)
    at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
    at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
Caused by: org.eclipse.osgi.framework.internal.core.AbstractBundle$BundleStatusException
    ... 101 more

编辑 3:

日志的 java.lang.NullPointerException 部分:

!ENTRY org.eclipse.ui.workbench 4 2 2011-11-30 11:24:25.757
!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.ui.workbench".
!STACK 0
java.lang.NullPointerException
    at org.eclipse.m2e.jdt.internal.MavenClasspathVariableInitializer.initialize(MavenClasspathVariableInitializer.java:30)
    at org.eclipse.jdt.core.JavaCore.getClasspathVariable(JavaCore.java:2908)
    at org.eclipse.jdt.internal.core.JavaModelManager.getResolvedVariablePath(JavaModelManager.java:2549)
    at org.eclipse.jdt.internal.core.JavaModelManager.resolveVariableEntry(JavaModelManager.java:2469)
    at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2645)
    at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2838)
    at org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath(JavaProject.java:1943)
    at org.eclipse.jdt.internal.core.JavaProject.buildStructure(JavaProject.java:461)
    at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:258)
    at org.eclipse.jdt.internal.core.Openable.openAncestors(Openable.java:504)
    at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:240)
    at org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:518)
    at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:255)
    at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:241)
    at org.eclipse.jdt.internal.core.PackageFragmentRoot.getKind(PackageFragmentRoot.java:477)
    at org.eclipse.jdt.internal.core.PackageFragment.getKind(PackageFragment.java:290)
    at org.eclipse.jdt.internal.core.PackageFragment.validateExistence(PackageFragment.java:506)
    at org.eclipse.jdt.internal.core.Openable.exists(Openable.java:206)
    at org.eclipse.jdt.internal.core.PackageFragment.exists(PackageFragment.java:174)
    at org.eclipse.jdt.ui.StandardJavaElementContentProvider.exists(StandardJavaElementContentProvider.java:451)
    at org.eclipse.jdt.ui.StandardJavaElementContentProvider.getParent(StandardJavaElementContentProvider.java:249)
    at org.eclipse.jdt.internal.ui.javaeditor.JavaEditorBreadcrumb$JavaEditorBreadcrumbContentProvider.getParent(JavaEditorBreadcrumb.java:333)
    at org.eclipse.jdt.internal.ui.javaeditor.breadcrumb.BreadcrumbViewer.buildItemChain(BreadcrumbViewer.java:608)
    at org.eclipse.jdt.internal.ui.javaeditor.breadcrumb.BreadcrumbViewer.buildItemChain(BreadcrumbViewer.java:610)
    at org.eclipse.jdt.internal.ui.javaeditor.breadcrumb.BreadcrumbViewer.inputChanged(BreadcrumbViewer.java:306)
    at org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:280)
    at org.eclipse.jface.viewers.StructuredViewer.setInput(StructuredViewer.java:1690)
    at org.eclipse.jdt.internal.ui.javaeditor.breadcrumb.EditorBreadcrumb.setInput(EditorBreadcrumb.java:169)
    at org.eclipse.jdt.internal.ui.javaeditor.JavaEditorBreadcrumb.setInput(JavaEditorBreadcrumb.java:788)
    at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.setBreadcrumbInput(JavaEditor.java:2007)
    at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.showBreadcrumb(JavaEditor.java:1981)
    at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.handlePreferenceStoreChanged(JavaEditor.java:2883)
    at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor.handlePreferenceStoreChanged(CompilationUnitEditor.java:1620)
    at org.eclipse.ui.texteditor.AbstractTextEditor$PropertyChangeListener.propertyChange(AbstractTextEditor.java:710)
    at org.eclipse.ui.texteditor.ChainedPreferenceStore.firePropertyChangeEvent(ChainedPreferenceStore.java:164)
    at org.eclipse.ui.texteditor.ChainedPreferenceStore.handlePropertyChangeEvent(ChainedPreferenceStore.java:431)
    at org.eclipse.ui.texteditor.ChainedPreferenceStore.access$0(ChainedPreferenceStore.java:408)
    at org.eclipse.ui.texteditor.ChainedPreferenceStore$PropertyChangeListener.propertyChange(ChainedPreferenceStore.java:69)
    at org.eclipse.ui.preferences.ScopedPreferenceStore$3.run(ScopedPreferenceStore.java:375)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.ui.preferences.ScopedPreferenceStore.firePropertyChangeEvent(ScopedPreferenceStore.java:372)
    at org.eclipse.jdt.internal.ui.javaeditor.ToggleBreadcrumbAction.perspectiveActivated(ToggleBreadcrumbAction.java:135)
    at org.eclipse.ui.internal.PerspectiveListenerList$1.run(PerspectiveListenerList.java:74)
    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.PerspectiveListenerList.fireEvent(PerspectiveListenerList.java:58)
    at org.eclipse.ui.internal.PerspectiveListenerList.firePerspectiveActivated(PerspectiveListenerList.java:72)
    at org.eclipse.ui.internal.WorkbenchWindow.firePerspectiveActivated(WorkbenchWindow.java:1450)
    at org.eclipse.ui.internal.WorkbenchPage$18.runWithException(WorkbenchPage.java:3350)
    at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
    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:4140)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3757)
    at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803)
    at org.eclipse.ui.internal.Workbench$33.runWithException(Workbench.java:1595)
    at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
    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:4140)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3757)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
    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)
    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:622)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
    at org.eclipse.equinox.launcher.Main.main(Main.java:1386)

编辑 2:

我已经确认此错误只会在我重新启动时弹出。当我重新启动 Eclipse 时，它​​不会弹出。或者，如果我在重新启动后启动 Eclipse，工作区非常干净(其中没有主要项目)，不会导致错误，然后打开我的主要项目，错误不会弹出。但是错误仍然出现在日志中。

编辑 4:

软件版本:

• Eclipse 版本:Indigo Release Build id:20110615-0604
• Maven 版本:3.0.3

编辑 5:

我想我会分享我对这个问题的黑客解决方案，发生此错误时唯一使我的项目工作的东西，这是清除 Eclipse 中的所有项目并让它自动重新编译。我还必须使用 Maven 处理 process-resources。它使我的项目再次运行。

编辑 6:

我注意到如果我关闭 Eclipse 并使用不同的(简单得多的)工作区(我用于测试 Java 代码)加载 Eclipse，它不会产生此错误。然后，如果我关闭该 Eclipse 实例并使用我的主项目再次加载 Eclipse，错误就消失了。我将继续对此做笔记，以尝试弄清楚它是否与我的主要项目有关。

Answer 1

我会考虑将最新版本的 eclipse 部署到您的机器上并重新创建您的首选项。不会花那么长时间，您还将摆脱不需要的插件。通常，插件是启动时随机错误的罪魁祸首。

对我有用的是拥有不同版本的 eclipse:一种用于 php，一种用于 scala，一种用于 java，一种用于 android，一种用于 ruby​​，等等...这样我对每个版本的设置就不会搞砸另一个实例的设置。无论如何，设置一个新的 eclipse 实例几乎不需要时间……所以也许这个方法对你有用!