I have a server-side JAX-WS SOAPHandler (on WebSphere v8) that in certain cases needs to respond to the client with a SOAP response that it has in a String variable
SOAPHandler
The actual problem is not the missing caused by exception, it is rather a unified fault handling in websphere:
http://www-01.ibm.com/support/docview.wss?uid=swg1PM58524
Either use the described workaround or install at least 8.0.0.4