java web service client, adding http headers

You can pass a map with custom headers to the BindingProvider (I believe you can set the MessageContext.HTTP_REQUEST_HEADERS property). Try creating an Authorization header and passing it in.

Here is the code, based on Femi's answer.

It can be a little tricky to figure out. Works beautifully!

Service jaxwsService = Service.create(wsdlURL, serviceName);
Dispatch<SOAPMessage> disp = jaxwsService.createDispatch(portName, SOAPMessage.class, Service.Mode.MESSAGE);

//Add HTTP request Headers
Map<String, List<String>> requestHeaders = new HashMap<>();
requestHeaders.put("Auth-User", Arrays.asList("BILL_GATES"));
disp.getRequestContext().put(MessageContext.HTTP_REQUEST_HEADERS, requestHeaders);