让我通知你，我是hadoop域名的初学者。所以，我指的是https://developer.yahoo.com/hadoop/tutorial/module3.html教程。我完成了所有设置，只是将所有代码复制到我的eclipse map-reduce项目中。就wordcountmapper，wordcountreducer和wordcount.java文件而言，没有出现任何错误。
现在，当我点击在hadoop上运行并在VM播放器上选择已设置的服务器并单击下一步时，之后就没有任何事情发生了。同样的“在选定的服务器页面上运行hadoop”就像被卡住了一样。进度信息面板的跨度非常短，因此无法检查其实际内容。
但是，这是我在完成所有这些步骤后每次都获得的日志文件。请帮帮我。自从过去2天以来，我一直在努力。至于所需的库，我已经从hadoop安装路径添加了所有必需的.jar文件。
.log文件内容---
!ENTRY org.eclipse.ui 4 0 2015-05-31 16:56:39.849
!MESSAGE Unhandled event loop exception
!STACK 0
java.lang.ClassCastException: org.eclipse.swt.widgets.Table cannot be cast to org.eclipse.swt.widgets.TableColumn
at org.eclipse.swt.widgets.Table.getColumn(Table.java:766)
at org.eclipse.swt.widgets.Table.releaseChildren(Table.java:1532)
at org.eclipse.swt.widgets.Widget.release(Widget.java:816)
at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:840)
at org.eclipse.swt.widgets.Widget.release(Widget.java:816)
at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:840)
at org.eclipse.swt.widgets.Widget.release(Widget.java:816)
at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:840)
at org.eclipse.swt.widgets.Widget.release(Widget.java:816)
at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:840)
at org.eclipse.swt.widgets.Widget.release(Widget.java:816)
at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:840)
at org.eclipse.swt.widgets.Widget.release(Widget.java:816)
at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:840)
at org.eclipse.swt.widgets.Widget.release(Widget.java:816)
at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:840)
at org.eclipse.swt.widgets.Canvas.releaseChildren(Canvas.java:120)
at org.eclipse.swt.widgets.Decorations.releaseChildren(Decorations.java:501)
at org.eclipse.swt.widgets.Shell.releaseChildren(Shell.java:932)
at org.eclipse.swt.widgets.Widget.release(Widget.java:816)
at org.eclipse.swt.widgets.Widget.dispose(Widget.java:445)
at org.eclipse.swt.widgets.Decorations.dispose(Decorations.java:282)
at org.eclipse.swt.widgets.Shell.dispose(Shell.java:566)
at org.eclipse.jface.window.Window.close(Window.java:330)
at org.eclipse.jface.dialogs.Dialog.close(Dialog.java:971)
at org.eclipse.jface.dialogs.TrayDialog.close(TrayDialog.java:143)
at org.eclipse.jface.wizard.WizardDialog.hardClose(WizardDialog.java:797)
at org.eclipse.jface.wizard.WizardDialog.close(WizardDialog.java:427)
at org.eclipse.jface.wizard.WizardDialog.cancelPressed(WizardDialog.java:414)
at org.eclipse.jface.wizard.WizardDialog$1.widgetSelected(WizardDialog.java:293)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:227)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1006)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2413)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2164)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:820)
at org.eclipse.jface.window.Window.open(Window.java:796)
at org.apache.hadoop.eclipse.launch.HadoopApplicationLaunchShortcut.findLaunchConfiguration(HadoopApplicationLaunchShortcut.java:110)
at org.eclipse.jdt.internal.debug.ui.launcher.JavaLaunchShortcut.launch(JavaLaunchShortcut.java:109)
at org.eclipse.jdt.internal.debug.ui.launcher.JavaLaunchShortcut.searchAndLaunch(JavaLaunchShortcut.java:74)
at org.eclipse.jdt.internal.debug.ui.launcher.JavaLaunchShortcut.launch(JavaLaunchShortcut.java:227)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchShortcutExtension.launch(LaunchShortcutExtension.java:429)
at org.eclipse.debug.internal.ui.actions.LaunchShortcutAction.run(LaunchShortcutAction.java:66)
at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:546)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:490)
at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:402)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1006)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2413)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2164)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219)
at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:169)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:508)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:447)
at org.eclipse.equinox.launcher.Main.run(Main.java:1173)
答案 0 :(得分：0)
该错误似乎与hadoop无关。我也找不到该页面中SWT表或列的任何引用。
你可以启动一个普通的java应用程序来查看它是否正常工作，然后从终端运行wordcount（$ HADOOP_HOME / share / hadoop / mapreduce / hadoop-mapreduce-examples）来测试你的hadoop安装。在那之后你应该回到eclipse看看它是否正常工作（在hadoop中从终端运行东西的问题总是少，而不是直接从eclipse运行）