Classic classloading issue. You will find these wiki pages useful:
http://wiki.jboss.org/wiki/Wiki.jsp?page=ClassLoadingConfiguration
http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossClassLoadingUseCases
In short, its recommended that you package those 3rd party jar into your application and
then have classloader isolation enabled on your application to avoid and version conflicts
with existing libraries in JBoss/other applications deployed on JBoss.
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