Hi,
do you use a "plain" eclipse or do you use Eclipse WebTools Platform plugin or JBoss Tools plugin? Both plugins make it possible to start a Java client application without having to struggle with JAR includes.
If you want to start the client by using a batch file, you will have to include probably all of the JARs in "jboss-6.0.0.Final\client\" in your classpath.
With a lot of "try and error", you can reduce this to a set of "really" required JARs, but there is always the chance the later a "ClassNotFoundException" will be thrown.
Hope this helps
Wolfgang