CallImpl mycall = (CallImpl)call;
QName xmlName = new QName(HEADER_NAMESPACE_URI, "headerMsg");
mycall.addParameter(xmlName, Constants.TYPE_LITERAL_STRING, String.class, ParameterMode.INOUT, true);
StringHolder holder = new StringHolder("INOUT header message");
Object retObj = call.invoke(new Object[]{"Hello world!", holder});
assertNull(retObj);
Map outputParams = call.getOutputParams();
Object headerValue = outputParams.get(xmlName.getLocalPart());
assertEquals("INOUT header message - response", headerValue);