Testcase from regression workspace, bug4774166.java is failing on Linux but passing on Solaris and Windows platforms with Tiger JDKS.

Testcase Location:
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/net/urts071.india/export6/testSuites/Regression/workspace_150/test/javax/swing/InputVerifier/4774166/bug4774166.java

JDK:
====
java -version
java version "1.5.0_07-ea"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_07-ea-b01)
Java HotSpot(TM) Client VM (build 1.5.0_07-ea-b01, mixed mode, sharing)

Operating System:
================
cat /etc/SuSE-release
SUSE LINUX Enterprise Server 9 (i586)
VERSION = 9

Steps to reproduce:
===================
1. Install JDK in test machine.
2. copy attached .java files ( bug4774166.java, JRobot.java and Util.java) into test machine.
3. Compile *.java files with tested JDK with following command:
   <jdk location>/bin/javac *.java
4. Start the test with the following command:
   <jdk location>/bin/java bug4774166

ERROR:
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Exception in thread "main" java.lang.RuntimeException: Focus error. Test failed!
        at bug4774166.main(bug4774166.java:153)