This seems to happen also today, I performed a fresh installation, plugin 
version is 3.0.8.1, with eclipse 3.1.2 and the problem persists:

java.lang.NullPointerException
        at org.jbpm.ui.properties.ActionHandlerPropertyPage.performOk(Unknown 
Source)
        at 
org.eclipse.jface.preference.PreferenceDialog$11.run(PreferenceDialog.java:862)
        at 
org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:1044)
        at org.eclipse.core.runtime.Platform.run(Platform.java:783)
        at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:44)
        at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:148)
        at 
org.eclipse.jface.preference.PreferenceDialog.okPressed(PreferenceDialog.java:842)
        at 
org.eclipse.ui.internal.dialogs.FilteredPreferenceDialog.okPressed(FilteredPreferenceDialog.java:296)
        at 
org.eclipse.jface.preference.PreferenceDialog.buttonPressed(PreferenceDialog.java:227)
        at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:556)
        at 
org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:90)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1021)
        at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2867)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2572)
        at org.eclipse.jface.window.Window.runEventLoop(Window.java:809)
        at org.eclipse.jface.window.Window.open(Window.java:787)
        at 
org.eclipse.ui.dialogs.PropertyDialogAction.run(PropertyDialogAction.java:157)
        at org.jbpm.ui.part.tree.ElementTreeEditPart.openPropertyDialog(Unknown 
Source)
        at org.jbpm.ui.part.tree.ElementTreeEditPart.performRequest(Unknown 
Source)
        at org.jbpm.ui.outline.DesignerOutlineViewer.handleDoubleClick(Unknown 
Source)
        at org.jbpm.ui.outline.DesignerOutlineViewer.access$3(Unknown Source)
        at org.jbpm.ui.outline.DesignerOutlineViewer$4.mouseDoubleClick(Unknown 
Source)
        at 
org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:141)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1021)
        at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2867)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2572)
        at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1699)
        at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1663)
        at 
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:367)
        at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:143)
        at 
org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:103)
        at 
org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:226)
        at 
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:376)
        at 
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:163)
        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:324)
        at org.eclipse.core.launcher.Main.invokeFramework(Main.java:334)
        at org.eclipse.core.launcher.Main.basicRun(Main.java:278)
        at org.eclipse.core.launcher.Main.run(Main.java:973)
        at org.eclipse.core.launcher.Main.main(Main.java:948)


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