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Steps to reproduce: - create JFrame from template - set layout to BoxLayout - add two JPanels - try to add some component (e.g. JButton) from the Component Palette to a JPanel => exception is thrown (see att.)
Created attachment 29 [details] StackTrace of exception
This happens whenever trying to add a component to a container which was copied (cut) & pasted. No relation to BoxLayout.
Fixed in the main trunk, not in branch "boston".
Bug assigned to the module owner.
Fixed in boston branch too.
Resolved for 3.3.x or earlier, no new info since then -> closing.