You should post this on the JBoss forums. I don't know if you have simply not included the correct jars on the classpath or of the client jars in 4.0.3RC1 aren't uptodate. But, you can probably get faster help there.
Joined: Jul 14, 2005
I solved it with help from the JBoss forum: The file common-httpclient.jar was missing.
Anyway, the response time in this forum is quite faster than of the JBoss forum, that's the reason why I prefer posting here