My team discovered this:
If JBOSS use a JDK version with JAI component installed then this problem is risen when you try to consume a web service, if you are in this case you should have 2 JDK installed one with JAI component and the another one without it, and start JBOSS with the second one.
And I had this error when running JBoss ESB trialblazer example with JDK 1.6
JDK 1.6 ships with jax-ws jar files, which then conflict with the jax-ws jar files provided JBossWS 1.2. I recommend not using JDK 1.6 with JBossWS.