[jbosstools-issues] [JBoss JIRA] Commented: (JBIDE-7914) org.drools.eclipse.core.DefaultRuleGroup cannot be cast to org.eclipse.emf.ecore.EObject

[Kris Verlaenen (JIRA)]

    [ https://issues.jboss.org/browse/JBIDE-7914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12570508#comment-12570508 ] 

Kris Verlaenen commented on JBIDE-7914:
---------------------------------------

I've tried to reproduce this and it does not occur on Eclipse 3.6.1 with only the Drools Eclipse plugin installed.
Looking at the stack trace, it seems the metamatrix plugin is somehow kicking in and trying to do something with the outline produced by drools.
Is this a possible conflict between the Drools and MetaMatrix plugin? Can someone from metamatrix explain what action they are doing (and why they expect an ecore model)?

> org.drools.eclipse.core.DefaultRuleGroup cannot be cast to org.eclipse.emf.ecore.EObject
> ----------------------------------------------------------------------------------------
>
>                 Key: JBIDE-7914
>                 URL: https://issues.jboss.org/browse/JBIDE-7914
>             Project: Tools (JBoss Tools)
>          Issue Type: Bug
>          Components: drools
>    Affects Versions: 3.2.0.Beta2
>            Reporter: Vitali Yemialyanchyk
>            Assignee: Kris Verlaenen
>         Attachments: screenshot-1.jpg
>
>
> 1) Drools workbench -> New drools project -> any proj name -> check all checkboxes -> other by default;
> 2) open Sample.drl;
> 3) in Outline view -> click on nodes -> click on *default* -> get exception:
> org.drools.eclipse.core.DefaultRuleGroup cannot be cast to org.eclipse.emf.ecore.EObject
> java.lang.ClassCastException: org.drools.eclipse.core.DefaultRuleGroup cannot be cast to org.eclipse.emf.ecore.EObject
> 	at com.metamatrix.modeler.internal.ui.actions.workers.ModelObjectWorker.isReadOnly(ModelObjectWorker.java:134)
> 	at com.metamatrix.modeler.internal.ui.actions.workers.CloneWorker.setEnabledState(CloneWorker.java:58)
> 	at com.metamatrix.modeler.internal.ui.actions.workers.ModelObjectWorker.selectionChanged(ModelObjectWorker.java:181)
> 	at com.metamatrix.modeler.internal.ui.actions.DesignerUiPropertyTester.isCloneAllowed(DesignerUiPropertyTester.java:91)
> 	at com.metamatrix.modeler.internal.ui.actions.DesignerUiPropertyTester.test(DesignerUiPropertyTester.java:45)
> 	at org.eclipse.core.internal.expressions.Property.test(Property.java:58)
> 	at org.eclipse.core.internal.expressions.TestExpression.evaluate(TestExpression.java:99)
> 	at org.eclipse.ui.internal.services.EvaluationResultCache.evaluate(EvaluationResultCache.java:74)
> 	at org.eclipse.ui.internal.services.ExpressionAuthority.evaluate(ExpressionAuthority.java:165)
> 	at org.eclipse.ui.internal.services.EvaluationAuthority.refsWithSameExpression(EvaluationAuthority.java:155)
> 	at org.eclipse.ui.internal.services.EvaluationAuthority.sourceChanged(EvaluationAuthority.java:129)
> 	at org.eclipse.ui.internal.services.ExpressionAuthority.sourceChanged(ExpressionAuthority.java:311)
> 	at org.eclipse.ui.internal.services.ExpressionAuthority.sourceChanged(ExpressionAuthority.java:302)
> 	at org.eclipse.ui.AbstractSourceProvider.fireSourceChanged(AbstractSourceProvider.java:80)
> 	at org.eclipse.ui.internal.services.WorkbenchSourceProvider.selectionChanged(WorkbenchSourceProvider.java:177)
> 	at org.eclipse.ui.internal.AbstractSelectionService.fireSelection(AbstractSelectionService.java:156)
> 	at org.eclipse.ui.internal.AbstractSelectionService$1.selectionChanged(AbstractSelectionService.java:62)
> 	at org.eclipse.ui.part.PageBookView$5.run(PageBookView.java:255)
> 	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
> 	at org.eclipse.core.runtime.Platform.run(Platform.java:888)
> 	at org.eclipse.ui.part.PageBookView$SelectionManager.selectionChanged(PageBookView.java:253)
> 	at org.eclipse.ui.part.PageBookView$SelectionProvider.selectionChanged(PageBookView.java:319)
> 	at org.eclipse.ui.part.PageBookView.pageSelectionChanged(PageBookView.java:896)
> 	at org.eclipse.ui.part.PageBookView.access$2(PageBookView.java:891)
> 	at org.eclipse.ui.part.PageBookView$2.selectionChanged(PageBookView.java:163)
> 	at org.eclipse.ui.views.contentoutline.ContentOutlinePage$1.run(ContentOutlinePage.java:99)
> 	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
> 	at org.eclipse.ui.views.contentoutline.ContentOutlinePage.fireSelectionChanged(ContentOutlinePage.java:97)
> 	at org.eclipse.ui.views.contentoutline.ContentOutlinePage.selectionChanged(ContentOutlinePage.java:157)
> 	at org.eclipse.jface.viewers.Viewer$2.run(Viewer.java:162)
> 	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
> 	at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)
> 	at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
> 	at org.eclipse.jface.viewers.Viewer.fireSelectionChanged(Viewer.java:160)
> 	at org.eclipse.jface.viewers.StructuredViewer.updateSelection(StructuredViewer.java:2162)
> 	at org.eclipse.jface.viewers.StructuredViewer.handleSelect(StructuredViewer.java:1190)
> 	at org.eclipse.jface.viewers.StructuredViewer$4.widgetSelected(StructuredViewer.java:1220)
> 	at org.eclipse.jface.util.OpenStrategy.fireSelectionEvent(OpenStrategy.java:228)
> 	at org.eclipse.jface.util.OpenStrategy.access$4(OpenStrategy.java:222)
> 	at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:389)
> 	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
> 	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
> 	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4066)
> 	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657)
> 	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)
> 	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
> 	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
> 	at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
> 	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
> 	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
> 	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
> 	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
> 	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:369)
> 	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
> 	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:619)
> 	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)
> 	at org.eclipse.equinox.launcher.Main.run(Main.java:1407)

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