JDK 5.0 was the reason of the Problem. It was too recent for the older JBOSS version
JBoss-2.4.0_Tomcat-3.2.3. After i changed to jdk 1.3.1 and built the application again
with the jdk 1.3.1, it ran without any problem. It is very Important to build it again
with the jdk 1.3.1 and deploy it then. Otherwise you will get
InvalidClassVersionException.
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