Web service responses sent from JBoss that are MTOM/XOP encoded cannot be parsed by some clients because the root MIME part does not contain charset parameter.

RFC2616 Sections 14.17 and 3.7.1 state that the charset is not required unless it differs from the implicit default of "ISO-8859-1". JBossWS is encoding the root MIME part in UTF8, so the charset must be provided.

As such, this is a bug in JBossWS.