大家好，我正在使用hadoop2.2.0和eclipsejuno以及hadoopeclipse插件，它以前工作正常，但突然停止工作，甚至没有在eclipse plz中显示dfs位置，帮助它显示以下错误

Plug-in org.apache.hadoop.eclipse was unable to load class org.apache.hadoop.eclipse.view.servers.ServerView.

这是错误日志

eclipse.buildId=I20120608-1400
java.version=1.6.0_31
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=linux, ARCH=x86, WS=gtk, NL=en_IN
Framework arguments:  -product org.eclipse.epp.package.jee.product
Command-line arguments:  -os linux -ws gtk -arch x86 -product org.eclipse.epp.package.jee.product

This is a continuation of log file /home/sumit/workspace/.metadata/.bak_0.log
Created Time: 2014-06-15 14:07:21.872

Error
Sun Jun 15 14:07:21 IST 2014
Problems occurred when invoking code from plug-in: "org.eclipse.ui.navigator".

org.eclipse.core.runtime.CoreException: No property tester contributes a property mapreduce.deployable to type class org.eclipse.core.internal.resources.Project
    at org.eclipse.core.internal.expressions.TypeExtensionManager.getProperty(TypeExtensionManager.java:123)
    at org.eclipse.core.internal.expressions.TestExpression.evaluate(TestExpression.java:96)
    at org.eclipse.core.internal.expressions.CompositeExpression.evaluateAnd(CompositeExpression.java:53)
    at org.eclipse.core.internal.expressions.AdaptExpression.evaluate(AdaptExpression.java:91)
    at org.eclipse.core.internal.expressions.CompositeExpression.evaluateOr(CompositeExpression.java:68)
    at org.eclipse.core.internal.expressions.OrExpression.evaluate(OrExpression.java:21)
    at org.eclipse.ui.internal.navigator.NavigatorPlugin$Evaluator.run(NavigatorPlugin.java:245)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.ui.internal.navigator.CustomAndExpression.evaluate(CustomAndExpression.java:71)
    at org.eclipse.ui.internal.navigator.NavigatorPlugin$Evaluator.run(NavigatorPlugin.java:245)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.ui.internal.navigator.NavigatorPlugin.safeEvaluate(NavigatorPlugin.java:260)
    at org.eclipse.ui.internal.navigator.extensions.NavigatorContentDescriptor.isTriggerPoint(NavigatorContentDescriptor.java:426)
    at org.eclipse.ui.internal.navigator.extensions.NavigatorContentDescriptorManager.findDescriptors(NavigatorContentDescriptorManager.java:236)
    at org.eclipse.ui.internal.navigator.extensions.NavigatorContentDescriptorManager.findDescriptorsForTriggerPoint(NavigatorContentDescriptorManager.java:187)
    at org.eclipse.ui.internal.navigator.NavigatorContentService.findDescriptorsByTriggerPoint(NavigatorContentService.java:805)
    at org.eclipse.ui.internal.navigator.NavigatorContentService.findContentExtensionsByTriggerPoint(NavigatorContentService.java:654)
    at org.eclipse.ui.internal.navigator.NavigatorContentService.findContentExtensionsByTriggerPoint(NavigatorContentService.java:635)
    at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.hasChildren(NavigatorContentServiceContentProvider.java:377)
    at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.hasChildren(NavigatorContentServiceContentProvider.java:422)
    at org.eclipse.jface.viewers.AbstractTreeViewer.isExpandable(AbstractTreeViewer.java:2138)
    at org.eclipse.jface.viewers.TreeViewer.isExpandable(TreeViewer.java:588)
    at org.eclipse.jface.viewers.AbstractTreeViewer.isExpandable(AbstractTreeViewer.java:2176)
    at org.eclipse.jface.viewers.AbstractTreeViewer.optionallyPruneChildren(AbstractTreeViewer.java:2808)
    at org.eclipse.jface.viewers.AbstractTreeViewer.updateChildren(AbstractTreeViewer.java:2608)
    at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefreshStruct(AbstractTreeViewer.java:1923)
    at org.eclipse.jface.viewers.TreeViewer.internalRefreshStruct(TreeViewer.java:721)
    at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefreshStruct(AbstractTreeViewer.java:1930)
    at org.eclipse.jface.viewers.TreeViewer.internalRefreshStruct(TreeViewer.java:721)
    at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh(AbstractTreeViewer.java:1898)
    at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh(AbstractTreeViewer.java:1855)
    at org.eclipse.ui.navigator.CommonViewer.internalRefresh(CommonViewer.java:561)
    at org.eclipse.jface.viewers.StructuredViewer$8.run(StructuredViewer.java:1535)
    at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1443)
    at org.eclipse.jface.viewers.TreeViewer.preservingSelection(TreeViewer.java:403)
    at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1404)
    at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1533)
    at org.eclipse.jface.viewers.ColumnViewer.refresh(ColumnViewer.java:548)
    at org.eclipse.ui.navigator.CommonViewer.refresh(CommonViewer.java:353)
    at org.eclipse.ui.navigator.CommonViewer.refresh(CommonViewer.java:510)
    at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1465)
    at org.eclipse.ui.internal.navigator.resources.actions.WorkingSetActionProvider.setWorkingSet(WorkingSetActionProvider.java:310)
    at org.eclipse.ui.internal.navigator.resources.actions.WorkingSetActionProvider.initWorkingSetFilter(WorkingSetActionProvider.java:252)
    at org.eclipse.ui.internal.navigator.resources.actions.WorkingSetActionProvider$4.run(WorkingSetActionProvider.java:340)
    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:3529)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3182)
    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(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:622)
    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)