[jboss-user] ClassCastException in jBPM Graphical Process Designer

[Bender Heri]

Hello 

Just installed the new dev-Studio (3.0.0 GA) and try to understand the todolist tutorial example of the seam reference (http://www.redhat.com/docs/en-US/JBoss_Enterprise_Application_Platform/5.0.0/html/Seam_Reference_Guide/todo.html)

I created the file todo.jpdl.xml in the root of my todoList project (ear-Project) and copied the content of the tutorial page into it. Opening this this file with the "jBPM Graphical Process Designer" ("open with...") produces following exception:

java.lang.ClassCastException: org.eclipse.core.internal.resources.Project cannot be cast to org.eclipse.core.resources.IFolder
	at org.jbpm.gd.common.editor.Editor.checkReadOnly(Editor.java:339)
	at org.jbpm.gd.common.editor.Editor.createPages(Editor.java:95)
	at org.jbpm.gd.jpdl.editor.JpdlEditor.createPages(JpdlEditor.java:132)
	at org.eclipse.ui.part.MultiPageEditorPart.createPartControl(MultiPageEditorPart.java:357)
	at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:662)
	at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:462)
	at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
	at org.eclipse.ui.internal.EditorAreaHelper.setVisibleEditor(EditorAreaHelper.java:271)
	at org.eclipse.ui.internal.EditorManager.setVisibleEditor(EditorManager.java:1417)
	at org.eclipse.ui.internal.EditorManager$5.runWithException(EditorManager.java:942)
	at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3885)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3506)
	at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803)
	at org.eclipse.ui.internal.Workbench$28.runWithException(Workbench.java:1384)
	at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3885)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3506)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2316)
	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
	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:368)
	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:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1311)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1287)

What's going wrong? Am I missing something?

Thanks for help
Heri Bender