When I attempt to open several views (Working Memory, Agenda, Global, etc) within an JBoss Rules enabled Eclipse, I receive the following error: java.lang.NoClassDefFoundError: org/eclipse/debug/internal/ui/contexts/provisional/IDebugContextListener at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:620) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:161) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:501) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:471) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:430) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:413) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:189) at org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java:340) at org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:408) at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:369) at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:357) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:83) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:620) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:161) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:501) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:471) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:430) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:413) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:189) at org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java:340) at org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:408) at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:369) at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:357) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:83) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at org.eclipse.osgi.framework.internal.core.BundleLoader.loadClass(BundleLoader.java:289) at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:227) at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1269) at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:160) at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:788) at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243) at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:51) at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:235) at org.eclipse.ui.internal.registry.ViewDescriptor.createView(ViewDescriptor.java:69) at org.eclipse.ui.internal.ViewReference.createPartHelper(ViewReference.java:327) at org.eclipse.ui.internal.ViewReference.createPart(ViewReference.java:227) at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:592) at org.eclipse.ui.internal.Perspective.showView(Perspective.java:2077) at org.eclipse.ui.internal.WorkbenchPage.busyShowView(WorkbenchPage.java:1018) at org.eclipse.ui.internal.WorkbenchPage.access $18(WorkbenchPage.java:999) at org.eclipse.ui.internal.WorkbenchPage $19.run(WorkbenchPage.java:3666) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67) at org.eclipse.ui.internal.WorkbenchPage.showView(WorkbenchPage.java:3663) at org.eclipse.ui.internal.WorkbenchPage.showView(WorkbenchPage.java:3639) at org.eclipse.ui.handlers.ShowViewHandler.openView(ShowViewHandler.java:165) at org.eclipse.ui.handlers.ShowViewHandler.openOther(ShowViewHandler.java:109) at org.eclipse.ui.handlers.ShowViewHandler.execute(ShowViewHandler.java:77) at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:239) at org.eclipse.core.commands.Command.executeWithChecks(Command.java:475) at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:429) at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:165) at org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommand(SlaveHandlerService.java:247) at org.eclipse.ui.internal.ShowViewMenu$3.run(ShowViewMenu.java:128) at org.eclipse.jface.action.Action.runWithEvent(Action.java:498) at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:545) 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:1101) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3319) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2971) 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:153) 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(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) Anyone know what's going on? I'm running the IDE feature version 4.0.0.12865MR3, Eclipse 3.3, Sun JDK 1.5.0_12 on Fedora 7. Thanks, Eric