I've found the cause of the problem. The response message received from the remote service is invalid. <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> | <soapenv:Body> | <validCustomerResponse xmlns="urn:samples:schufa"> | <validCustomerReturn>true</validCustomerReturn> | </validCustomerResponse> | </soapenv:Body> | </soapenv:Envelope> The problem is that each part of the message should appear in a separate element with a local name that matches the part name and no namespace URI. This is specified by the WS-I Basic Profile 1.1, section 4.7.20. In the above message, the validCustomerResponse element sets the default namespace URI to urn:samples:schufa, causing the validCustomerReturn element to have the namespace URI urn:samples:schufa as well. A valid response would be: <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> | <soapenv:Body> | <validCustomerResponse xmlns="urn:samples:schufa"> | <validCustomerReturn xmlns="">true</validCustomerReturn> | </validCustomerResponse> | </soapenv:Body> | </soapenv:Envelope> View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3998070#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...