eclipse ide error

on ubuntu 11.10
eclipse does not open anymore

dialog box
an error has occurred. see the log file
/home/joe/workspace/.metadata/.log

!ENTRY org.eclipse.osgi 4 0 2012-03-15 11:47:22.393
!MESSAGE Application error
!STACK 1
java.lang.NoClassDefFoundError: Could not initialize class org.eclipse.jface.preference.PreferenceConverter
        at org.eclipse.ui.internal.themes.ThemeElementHelper.installFont(ThemeElementHelper.java:103)
        at org.eclipse.ui.internal.themes.ThemeElementHelper.populateRegistry(ThemeElementHelper.java:59)
        at org.eclipse.ui.internal.Workbench$38.runWithException(Workbench.java:1693)
        at org.eclipse.ui.internal.StartupThreading$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:3563)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3212)
        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(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        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)

!ENTRY org.eclipse.core.jobs 2 2 2012-03-15 11:47:23.746
!MESSAGE Job found still running after platform shutdown.  Jobs should be canceled by the plugin that scheduled them during shutdown: org.eclipse.core.internal.refresh.RefreshJob

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rgb192Asked:
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Chris Harte2015 Top Expert (Most Article Points)Commented:
Probably a problem you should ask at the Eclipse user forum

http://www.eclipse.org/forums/

Though it does look like eclipse has left a child process running that needs to be stopped before it can restart. Look for

$ ps -A | grep eclipse

and kill any you find. Eclipse may also have become corrupted (happened to me once during an update) in which case you may have to re-install.
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rgb192Author Commented:
I restarted computer, and still have same problem
other solutions
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rgb192Author Commented:
any other ideas?
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rgb192Author Commented:
>>in which case you may have to re-install.<br /><br />this is what I finally did when nothing else worked, so you provided a solution that works
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