How can I change namespace prefix for JAX-RPC client request?

Question

I'm creating a JAX-RPC client to invoke a RPC/encoded web service. The service was generated from a ColdFusion program and for some reason when the SOAP namespace prefix is anything but "soapenv" it returns text/html instead of text/xml. Currently the client is sending requests with the prefix "env" and I'd like to change it to "soapenv".
I created a type of javax.xml.rpc.handler.GenericHandler and attempted to do the follow:
@Override public boolean handleRequest(MessageContext p1) {
     SOAPMessage msg = ((SOAPMessageContext) p1).getMessage(); 
     try {
          SOAPPart part = msg.getSOAPPart();
          SOAPEnvelope envelope = part.getEnvelope(); 
          envelope.setPrefix("soapenv"); 
          msg.saveChanges(); 
     } catch(SOAPException ex) {
          // TODO
          return false;
     return true;
However I get the following exception:
java.rmi.RemoteException: SOAPFaultException - FaultCode [{http://schemas.xmlsoap.org/soap/envelope/}Server] FaultString [UNIMPLEMENTED ] FaultActor [null] Detail [<detail><bea_fault:stacktrace xmlns:bea_fault="http://www.bea.com/servers/wls70/webservice/fault/1.0.0">java.lang.AssertionError: UNIMPLEMENTED
at weblogic.xml.domimpl.NodeImpl.setPrefix(NodeImpl.java:173)
at test.MyHandler.handleRequest(MyHandler.java:33)
at weblogic.wsee.handler.JaxrpcHandlerChain.handleRequest(JaxrpcHandlerChain.java:58)
at weblogic.wsee.ws.dispatch.server.JaxrpcChainHandler.handleRequest(JaxrpcChainHandler.java:102)
at weblogic.wsee.handler.HandlerIterator.handleRequest(HandlerIterator.java:141)
at weblogic.wsee.handler.HandlerIterator.handleRequest(HandlerIterator.java:107)
at weblogic.wsee.ws.dispatch.client.ClientDispatcher.dispatch(ClientDispatcher.java:132)
at weblogic.wsee.ws.WsStub.invoke(WsStub.java:87)
at weblogic.wsee.jaxrpc.StubImpl._invoke(StubImpl.java:341)
at test.Approvedsuppliers_Wrap_Stub.echo(Approvedsuppliers_Wrap_Stub.java:31)
at test.Approvedsuppliers_WrapPortClient.echo(Approvedsuppliers_WrapPortClient.java:130)
at test.Approvedsuppliers_WrapPortClient.main(Approvedsuppliers_WrapPortClient.java:43)
Is there any workaround? I appreciate any feedback.
Thanks, Bill

Answer 1

What I ended up doing is converting the SOAP message to a string, replacing the namespace prefix and converting it back to a SOAP message.
@Override
   public boolean handleRequest(MessageContext messageContext) {
      SOAPMessageContext soapMessageContext = (SOAPMessageContext) messageContext;
      SOAPMessage soapMessage = soapMessageContext.getMessage();
      String soapString = convertSOAPToString(soapMessage);
      soapString = soapString.replaceAll("env:", "soapenv:");
      soapString = soapString.replaceAll("xmlns:env", "xmlns:soapenv");
      SOAPMessage newSoapMessage = convertStringToSOAP(soapString);
      MimeHeaders mimeHeader = newSoapMessage.getMimeHeaders();
      mimeHeader.setHeader("SOAPAction", "");
      soapMessageContext.setMessage(newSoapMessage);
      return true;
   private String convertSOAPToString(SOAPMessage soapMessage) {
      StringWriter stringWriter = null;
      try {
         stringWriter = new StringWriter();
         StreamResult streamResult = new StreamResult(stringWriter);
         TransformerFactory transformFactory = TransformerFactory.newInstance();
         Transformer transformer = transformFactory.newTransformer();
         transformer.transform(new DOMSource(soapMessage.getSOAPPart()), streamResult);
      } catch (TransformerException e) {
         throw new RuntimeException(e);
      } finally {
         close(stringWriter);
      return stringWriter.toString();   
   private SOAPMessage convertStringToSOAP(String soapString) {
      SOAPMessage soapMessage = null;
      ByteArrayInputStream byteInputStream = null;
      try {
         MessageFactory msgFactory = MessageFactory.newInstance();
         soapMessage = msgFactory.createMessage();
         SOAPPart soapPart = soapMessage.getSOAPPart();
         // Load the SOAP text into a stream source
         byte[] buffer = soapString.getBytes();
         byteInputStream = new ByteArrayInputStream(buffer);
         StreamSource source = new StreamSource(byteInputStream);
         // Set contents of message
         soapPart.setContent(source);       
      } catch (SOAPException e) {
         throw new RuntimeException(e);
      } finally {
         close(byteInputStream);
      return soapMessage;
   private void close(Closeable closeable) {
      if(closeable != null) {
         try {
            closeable.close();
         } catch (IOException e) {
            // TODO