Description of problem:
Java class with @WebService annotation and also @MTOM (enabled =true) has
two methods with @WebMethod annotation - one returns binary data , the other does not.
When calling the second method (e.g. with soapui), the raw data returned is multiparted (even though it is not required):

HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Content-Type: multipart/related; type="application/xop+xml"; boundary="uuid:febe2942-..."; start="<root.message.org>"; start-info="application/soap+xml"
Content-Length: 574
Date: Tue, 20 Sep 2016 12:43:09 GMT

--uuid:febe2942-.....
Content-Type: application/xop+xml; charset=UTF-8; type="application/soap+xml"
Content-Transfer-Encoding: binary
Content-ID: <root.message.org>

<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><env:Header xmlns:env="http://www.w3.org/2003/05/soap-envelope"/><soap:Body><ns2:noBlobResponse xmlns:ns2="http://ws.example.com/framework/wstest/MTOMTestWS"><String>Da is' was :-) : Hallo</String></ns2:noBlobResponse></soap:Body></soap:Envelope>
--uuid:febe2942-...--

With JBoss 5 the message was not multi-part in this situation.
Known issue https://issues.jboss.org/browse/JBWS-3593

Impacts EAP 6 & 7

How reproducible:
Always

Steps to Reproduce:
1.
2.
3.

Actual results:
 message multi-part

Expected results:
 message was not multi-part

Additional info: