Hello!
Yes, the following code solved it for me
MessageContext mc = webServiceContext.getMessageContext();
SOAPMessage message = ((SOAPMessageContextJAXWS) mc).getMessage();
ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
message.writeTo(byteOut);
String request = new String(byteOut.toByteArray(), "UTF-8");
Greetings
Andreas