Trivial JPanel problem, but cant around it!!

i am trying to add a JPanel, in CENTER of another panel (which already has a toolbar in its NORTH). when i set the background of the panel (which i am trying to add)....nothing happens
though when i set the background of the main panel, i can see the changed background color
how do i fix this??

Ye tat field is the primary key for the table, and
you're right the function works fine when everything
is entered in properly.
Are you saying that there is no way that you are
aware of catching this exception myself- I just have
to leave it for the SQL catch, I have tried similar
things on different pages and they are all giving me
the same result.
Huh?
When the table is empty there is no exception - correct?
When there is one entry in the table and another non-duplicate is entered there is no exception - correct?
When there is one entry in the table and another duplicate is entered there is an exception - correct?
If the answer to above are all yes, then that is exactly the behavior that should occur.
Now most databases report a differences via the text of the exception, and so you parse that if you want to differentiate.

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