FULL PRODUCT VERSION :
java version "1.6.0_16"
Java(TM) SE Runtime Environment (build 1.6.0_16-b01)
Java HotSpot(TM) Client VM (build 14.2-b01, mixed mode, sharing)


ADDITIONAL OS VERSION INFORMATION :
Linux desktop 2.6.9-22.ELsmp #1 SMP Mon Sep 19 18:32:14 EDT 2005 i686 i686 i386 GNU/Linux

EXTRA RELEVANT SYSTEM CONFIGURATION :
X Window System Version 6.8.2
  Release Date: 9 February 2005
X Protocol Version 11, Revision 0, Release 6.8.2
Build Operating System: Linux 2.4.21-25.ELsmp i686 [ELF]
Current Operating System: Linux desktop 2.6.9-22.ELsmp #1 SMP Mon Sep 19 18:32:14 EDT 2005 i686
Build Date: 19 September 2005
Build Host: porky.build.redhat.com

        Before reporting problems, check http://wiki.X.Org
        to make sure that you have the latest version.
Module Loader present
OS Kernel: Linux version 2.6.9-22.ELsmp (###@###.###) (gcc version 3.4.4 20050721 (Red Hat 3.4.4-2)) #1 SMP Mon Sep 19 18:32:14 EDT 2005 PF


A DESCRIPTION OF THE PROBLEM :
We have a product with a UI in which many containers (JPanels) with GridBagLayout. Each of these containers include one main child (JPanel).

Using java 1.5 and the child appears in the container occupying the whole area.
During the tests with Java1.6, the child JPanel does not exist anymore. and this problem appeared only since Java1.6 U13 (to update 16)

We figured out that the child panel is there but with a null size.


REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
we found a workaround in our code by adding the following listener in parent containers :

addComponentListener(new ComponentAdapter() {
@Override
public void componentResized(ComponentEvent e) {
childPanel.setSize(this.getSize()):
}
});

Release Regression From : 6u12
The above release value was the last known release where this
bug was not reproducible. Since then there has been a regression.