4680657/Bug4680657.java is passing intermittently( once in about 12 times)for all 1.4.2_xx jdks on all linux platforms. But testcase is passing for tiger all the times.

JDK:
====
java -version
java version "1.4.2_10"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_10-b02)
Java HotSpot(TM) Client VM (build 1.4.2_10-b02, mixed mode)

Operating System: SLES9.0, Madhatter-Cinnabar-Linux & RHEL 3.0
=================

Location of testcase:
====================
/net/urts071.india/export6/testSuites/Regression/workspace_142/test/javax/swing/JTabbedPane/4680657/Bug4680657.java

Steps to reproduce:
===================

1) Please copy the attached Bug4680657.java file

2) compile it
<jdk location>/j2sdk1.4.2_10/bin/javac Bug4680657.java

3) Run it
<jdk location>/j2sdk1.4.2_10/bin/java Bug4680657

Many times the following exception is being thrown.

ERROR:
======
Warning: Missing charsets in String to FontSet conversion
Warning: Missing charsets in String to FontSet conversion
Exception in thread "main" java.lang.NullPointerException
        at javax.swing.SizeRequirements.calculateAlignedPositions(SizeRequirements.java:442)
        at javax.swing.SizeRequirements.calculateAlignedPositions(SizeRequirements.java:403)
        at javax.swing.OverlayLayout.layoutContainer(OverlayLayout.java:205)
        at java.awt.Container.layout(Container.java:1020)
        at java.awt.Container.doLayout(Container.java:1010)
        at java.awt.Container.validateTree(Container.java:1092)
        at java.awt.Container.validateTree(Container.java:1099)
        at java.awt.Container.validateTree(Container.java:1099)
        at java.awt.Container.validateTree(Container.java:1099)
        at java.awt.Container.validateTree(Container.java:1099)
        at java.awt.Container.validateTree(Container.java:1099)
        at java.awt.Container.validate(Container.java:1067)
        at java.awt.Window.show(Window.java:461)
        at java.awt.Component.show(Component.java:1133)
        at java.awt.Component.setVisible(Component.java:1088)
        at Bug4680657.test(Bug4680657.java:51)
        at Bug4680657.main(Bug4680657.java:17)

The following report will show the test status on different platforms:

---------------------------------------------------------------------
Operationg System ~TotalRuns ~Pass ~Fail
----------------- --------- ----- ----
SLES 9.0 15 1 or 2 13
Madhatter-Cinnabar-Linux 15 1 or 2 13
RHEL 3 15 13 1 or 2
Solaris 15 15 --
Windows 15 15 --
-------------------------------------------------------------------
Note: TotalRuns:- Number of times i rerun the testcase.