MessageFactory messageFactory = MessageFactory.newInstance();
SOAPMessage soapMessage = messageFactory.createMessage();

// Retrieve different parts
SOAPPart soapPart = soapMessage.getSOAPPart();
SOAPEnvelope soapEnvelope = soapMessage.getSOAPPart().getEnvelope();

// Two ways to extract body
SOAPBody soapBody = soapEnvelope.getBody();
soapBody = soapMessage.getSOAPBody();

//Modify body
// Etc