Panel bug ?

[dflachbart]

I am trying to track down an exception, and I was able to isolate it in some minimal code:




If both panels have vertical scrolling set, I get the following exception:

Sat 2/10 15:46:34.038 Exception in thread "AWT-EventQueue-0" Sat 2/10 15:46:34.038 java.lang.StackOverflowError
Sat 2/10 15:46:34.039 at sage.a5.fn(Unknown Source)
Sat 2/10 15:46:34.040 at sage.a5.fz(Unknown Source)
Sat 2/10 15:46:34.040 at sage.a5.for(Unknown Source)
Sat 2/10 15:46:34.040 at sage.a5.for(Unknown Source)
Sat 2/10 15:46:34.040 at sage.a5.for(Unknown Source)
Sat 2/10 15:46:34.040 at sage.a5.for(Unknown Source)
[...]


If I remove the vertical scrolling from either one, the exception is gone.


Any explanation for this, or simply a bug ?


Dirk

[GKusnick]

Just guessing here, but perhaps there's a design limitation of one scrollable component per menu. Otherwise it might not know which component should receive scroll commands.

The fact that the symptom of this failure is a stack overflow rather than some more informative exception could probably be construed as a bug.

[nielm]

2 or more scrollable panels per menu should be possible, (my IMDB window has them, the left button bar is scrollable and the right contents are also scrollable).

This is just guesswork, but what may be an issue is that normally each scrolling panel has a non-scrolling parent panel to define it's 'viewport' and to put the scrollbars/arrows in, this is missing in the above tree...

(although I agree that the exception trace implies that there is also a bug!)