Marco Strauch [http://community.jboss.org/people/fambad] created the discussion "Re: Force MTOM Response in JBossWS-3.1.1.GA" To view the discussion, visit: http://community.jboss.org/message/591635#591635 -------------------------------------------------------------- I have found a workaround for this problem by my own. I have added a response handler to the webservice that add a dummy attachment part to the soap message and activate mtom using the method org.jboss.ws.extensions.xop.XOPContext#setMTOMEnabled(true) and declare the message as a XOP Message. That's all. *Code Sample:* public boolean handleMessage( MessageContext msgContext ) { .... ... +// decide if outbound and other code left out+.... ....      org.jboss.ws.core.soap.SOAPMessage msg = ((SOAPMessageContext) msgContext).getMessage();      org.jboss.ws.core.CommonMessageContext cmCtx = (org.jboss.ws.core.CommonMessageContext) msgContext;      ByteArrayDataSource DUMMY_PLAIN_DATA_SOURCE;      DUMMY_PLAIN_DATA_SOURCE = new ByteArrayDataSource( "DUMMY_ATTACHMENT_TO_FORCE_MTOM_RESPONSE", "text/plain" ); *msg.addAttachmentPart( msg.createAttachmentPart( new DataHandler( DUMMY_PLAIN_DATA_SOURCE ) ) );* *((SOAPMessageImpl) msg).setXOPMessage( true );*      Scope lastScope = cmCtx.getCurrentScope();      cmCtx.setCurrentScope( Scope.APPLICATION ); *XOPContext.setMTOMEnabled( true );*      cmCtx.setCurrentScope( lastScope ); ... } -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/591635#591635] Start a new discussion in JBoss Web Services at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]