解决：在命令行中启动，加入-clean参数

-clean
描述：清空插件缓存内容
举例：eclipse -clean，有时插件显示不出来是因为Eclipse将插件进行了缓存以加速启动过程，若指定此参数则会清空缓存，从头加载

错误信息：
!MESSAGE While loading class "org.eclipse.cdt.core.settings.model.util.ResourceChangeHandlerBase$DeltaVisITor", thread "Thread[org.eclipse.jdt.internal.ui.text.JaVAReconciler,1,main]" timed out waiting (5005ms) for thread "Thread[main,6,main]" to finish starting bundle "org.eclipse.cdt.core_5.4.1.201302132326 [954]". To avoid deadlock, thread "Thread[org.eclipse.jdt.internal.ui.text.JavaReconciler,1,main]" is PRoceeding but "org.eclipse.cdt.core.settings.model.util.ResourceChangeHandlerBase$DeltaVisitor" may not be fully initialized.
!STACK 0
org.osgi.framework.BundleException: State change in progress for bundle "reference:file:plugins/org.eclipse.cdt.core_5.4.1.201302132326.jar" by thread "main".
at org.eclipse.osgi.framework.internal.core.AbstractBundle.beginstateChange(AbstractBundle.java:1088)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:298)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:440)
at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:263)
at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:107)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:469)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:395)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:464)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at org.eclipse.cdt.core.settings.model.util.ResourceChangeHandlerBase.doHandleResourceMove(ResourceChangeHandlerBase.java:190)
at org.eclipse.cdt.core.settings.model.util.ResourceChangeHandlerBase.resourceChanged(ResourceChangeHandlerBase.java:150)
at org.eclipse.cdt.managedbuilder.core.ResourceChangeHandler2.resourceChanged(ResourceChangeHandler2.java:176)
at org.eclipse.core.internal.events.NotificationManager$1.run(NotificationManager.java:291)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:285)
at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:149)
at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:395)
at org.eclipse.core.internal.resources.Workspace.endoperation(Workspace.java:1530)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2353)
at org.eclipse.jdt.internal.core.JavaModelOPEration.runOperation(JavaModelOperation.java:793)
at org.eclipse.jdt.internal.core.JavaModelManager.getClasspathContainer(JavaModelManager.java:1881)
at org.eclipse.jdt.core.JavaCore.getClasspathContainer(JavaCore.java:3128)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2691)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2855)
at org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath(JavaProject.java:1960)
at org.eclipse.jdt.internal.core.JavaProject.buildStructure(JavaProject.java:463)
at org.eclipse.jdt.internal.core.Openable.generateinfos(Openable.java:258)
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.JavaProject.getJavaProjectElementInfo(JavaProject.java:1640)
at org.eclipse.jdt.internal.core.JavaProject.newNameLookup(JavaProject.java:2327)
at org.eclipse.jdt.internal.core.Se@R_126_2413@ableenvironment.(SearchableEnvironment.java:59)
at org.eclipse.jdt.internal.core.SearchableEnvironment.(SearchableEnvironment.java:66)
at org.eclipse.jdt.internal.core.CancelableNameEnvironment.(CancelableNameEnvironment.java:26)
at org.eclipse.jdt.internal.core.COMpilationUnitProblemfinder.process_aroundBody0(CompilationUnitProblemFinder.java:176)
at org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process_aroundBody1$advice(CompilationUnitProblemFinder.java:244)
at org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process(CompilationUnitProblemFinder.java:1)
at org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process(CompilationUnitProblemFinder.java:269)
at org.eclipse.jdt.internal.core.ReconcileWorkingCopyOperation.makeConsistent(ReconcileWorkingCopyOperation.java:190)
at org.eclipse.jdt.internal.core.ReconcileWorkingCopyOperation.executeOperation(ReconcileWorkingCopyOperation.java:89)
at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:728)
at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:788)
at org.eclipse.jdt.internal.core.CompilationUnit.reconcile(CompilationUnit.java:1247)
at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.reconcile(JavaReconcilingStrategy.java:126)
at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.access$0(JavaReconcilingStrategy.java:108)
at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy$1.run(JavaReconcilingStrategy.java:89)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.reconcile(JavaReconcilingStrategy.java:87)
at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.initialReconcile(JavaReconcilingStrategy.java:178)
at org.eclipse.jdt.internal.ui.text.CompositeReconcilingStrategy.initialReconcile(CompositeReconcilingStrategy.java:114)
at org.eclipse.jdt.internal.ui.text.JavaCompositeReconcilingStrategy.initialReconcile(JavaCompositeReconcilingStrategy.java:136)
at org.eclipse.jface.text.reconciler.MonoReconciler.initialProcess(MonoReconciler.java:105)
at org.eclipse.jdt.internal.ui.text.JavaReconciler.initialProcess(JavaReconciler.java:406)
at org.eclipse.jface.text.reconciler.AbstractReconciler$BackgroundThread.run(AbstractReconciler.java:173)
Caused by: org.eclipse.osgi.framework.internal.core.AbstractBundle$BundleStatusException
... 59 more
Root exception:
org.eclipse.osgi.framework.internal.core.AbstractBundle$BundleStatusException
at org.eclipse.osgi.framework.internal.core.AbstractBundle.beginStateChange(AbstractBundle.java:1088)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:298)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:440)
at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:263)
at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:107)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:469)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:395)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:464)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at org.eclipse.cdt.core.settings.model.util.ResourceChangeHandlerBase.doHandleResourceMove(ResourceChangeHandlerBase.java:190)
at org.eclipse.cdt.core.settings.model.util.ResourceChangeHandlerBase.resourceChanged(ResourceChangeHandlerBase.java:150)
at org.eclipse.cdt.managedbuilder.core.ResourceChangeHandler2.resourceChanged(ResourceChangeHandler2.java:176)
at org.eclipse.core.internal.events.NotificationManager$1.run(NotificationManager.java:291)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:285)
at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:149)
at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:395)
at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1530)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2353)
at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:793)
at org.eclipse.jdt.internal.core.JavaModelManager.getClasspathContainer(JavaModelManager.java:1881)
at org.eclipse.jdt.core.JavaCore.getClasspathContainer(JavaCore.java:3128)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2691)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2855)
at org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath(JavaProject.java:1960)
at org.eclipse.jdt.internal.core.JavaProject.buildStructure(JavaProject.java:463)
at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:258)
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.JavaProject.getJavaProjectElementInfo(JavaProject.java:1640)
at org.eclipse.jdt.internal.core.JavaProject.newNameLookup(JavaProject.java:2327)
at org.eclipse.jdt.internal.core.SearchableEnvironment.(SearchableEnvironment.java:59)
at org.eclipse.jdt.internal.core.SearchableEnvironment.(SearchableEnvironment.java:66)
at org.eclipse.jdt.internal.core.CancelableNameEnvironment.(CancelableNameEnvironment.java:26)
at org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process_aroundBody0(CompilationUnitProblemFinder.java:176)
at org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process_aroundBody1$advice(CompilationUnitProblemFinder.java:244)
at org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process(CompilationUnitProblemFinder.java:1)
at org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process(CompilationUnitProblemFinder.java:269)
at org.eclipse.jdt.internal.core.ReconcileWorkingCopyOperation.makeConsistent(ReconcileWorkingCopyOperation.java:190)
at org.eclipse.jdt.internal.core.ReconcileWorkingCopyOperation.executeOperation(ReconcileWorkingCopyOperation.java:89)
at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:728)
at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:788)
at org.eclipse.jdt.internal.core.CompilationUnit.reconcile(CompilationUnit.java:1247)
at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.reconcile(JavaReconcilingStrategy.java:126)
at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.access$0(JavaReconcilingStrategy.java:108)
at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy$1.run(JavaReconcilingStrategy.java:89)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.reconcile(JavaReconcilingStrategy.java:87)
at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.initialReconcile(JavaReconcilingStrategy.java:178)
at org.eclipse.jdt.internal.ui.text.CompositeReconcilingStrategy.initialReconcile(CompositeReconcilingStrategy.java:114)
at org.eclipse.jdt.internal.ui.text.JavaCompositeReconcilingStrategy.initialReconcile(JavaCompositeReconcilingStrategy.java:136)
at org.eclipse.jface.text.reconciler.MonoReconciler.initialProcess(MonoReconciler.java:105)
at org.eclipse.jdt.internal.ui.text.JavaReconciler.initialProcess(JavaReconciler.java:406)
at org.eclipse.jface.text.reconciler.AbstractReconciler$BackgroundThread.run(AbstractReconciler.java:173)

!ENTRY org.eclipse.ui.workbench 2 0 2014-03-31 10:37:48.622
!MESSAGE A handler conflict occurred. This may disable some commands.
!SubENTRY 1 org.eclipse.ui.workbench 2 0 2014-03-31 10:37:48.622
!MESSAGE Conflict for 'AUTOGEN:::org.springsource.ide.eclipse.commons.launch.actionSet/org.springsource.ide.eclipse.commons.launch.relaunch.action':
HandlerActivation(commandId=AUTOGEN:::org.springsource.ide.eclipse.commons.launch.actionSet/org.springsource.ide.eclipse.commons.launch.relaunch.action,
handler=ActionDelegateHandlerProxy(null,org.springsource.ide.eclipse.commons.ui.launch.StopProcessPullDownToolbarDelegate),
exPression=AndExpression(ActionSetExpression(org.springsource.ide.eclipse.commons.launch.actionSet,org.eclipse.ui.internal.WorkbenchWindow@89ffb18),WorkbenchWindowExpression(org.eclipse.ui.internal.WorkbenchWindow@89ffb18)),sourcePriority=16640)
HandlerActivation(commandId=AUTOGEN:::org.springsource.ide.eclipse.commons.launch.actionSet/org.springsource.ide.eclipse.commons.launch.relaunch.action,
handler=ActionDelegateHandlerProxy(null,org.springsource.ide.eclipse.commons.ui.launch.RelaunchProcessPullDownToolbarDelegate),
expression=AndExpression(ActionSetExpression(org.springsource.ide.eclipse.commons.launch.actionSet,org.eclipse.ui.internal.WorkbenchWindow@89ffb18),WorkbenchWindowExpression(org.eclipse.ui.internal.WorkbenchWindow@89ffb18)),sourcePriority=16640)

参考：http://www.blogjava.net/wangxinsh55/archive/2007/07/06/128589.html