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Put some (at least two) components to the container (for example JFrame). Change layout of this container to the CardLayout. You will see attached exception.
*** Bug 5450 has been marked as a duplicate of this bug. ***
Fixed in main trunk, not in branch boston.
Priority is changed to P4 (normal).
Verified in Build 2011.
Fixed in Boston1085
Resolved for 3.3.x or earlier, no new info since then -> closing.