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build 20080526 - create a use case diagram - DnD a use case or actor to the diagram - select the actor or use case element - drag the comment icon from the context palette to an empty diagram area Result: NPE popped up and created link with arrow head pointing to no where in the diagram area. See attached screenshot and ide log file for complete NPE stack trace.
Created attachment 62032 [details] usecase diagram
Created attachment 62033 [details] ide log file
Actually this is from other elements in other diagram types as well, eg, class element.
fixed http://hg.netbeans.org/uml-main/rev/88b8a623816a
verified in build 20080622