Description Camille Letavernier 2011-09-21 05:26:47 EDT

The following exception is thrown when trying to create an Association Class on an already existing Association :

java.lang.ClassCastException: org.eclipse.papyrus.diagram.clazz.edit.parts.AssociationEditPart cannot be cast to org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart
	at org.eclipse.papyrus.diagram.clazz.custom.helper.AssociationClassHelper.getAssociationClassElementCommand(AssociationClassHelper.java:251)
	at org.eclipse.papyrus.diagram.clazz.custom.policies.CustomGraphicalNodeEditPolicy.getCommand(CustomGraphicalNodeEditPolicy.java:60)
	at org.eclipse.gef.editparts.AbstractEditPart.getCommand(AbstractEditPart.java:502)
	[...]
	
	
There seems to be a confusion between GEF.GraphicalEditPart, GMF.IGraphicalEditPart and GMF.GraphicalEditPart, with unchecked, optimistic casts.
	
However, it is still possible to create an association class directly from two classes.

Steps to reproduce :

- Create two classes
- Create an association between these two classes
- Create an association class on the association

Workaround :

- Create two classes
- Create an association class between these two classes (Another exception is thrown, but this is another story, and this doesn't prevent the association class creation)