DOM Parsing concatenate help required

Hi All,

I am trying java mapping to concate two fields. Below is my code but I am getting error at line - String document_exit. Please help

Code -

public class conc extends AbstractTransformation {

    public void transform(TransformationInput input, TransformationOutput output)

        throws StreamTransformationException {

        String RESULT = new String();

       InputStream in = input.getInputPayload().getInputStream();

       OutputStream out = output.getOutputPayload().getOutputStream();

        try {

            //Create DOM parser

            Document doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(in);

            NodeList n1 = doc.getElementsByTagName("Emp_Name");

            NodeList n2 = doc.getElementsByTagName("Emp_Surname");

            String nv1 = doc.getNodeName();

            String nv2 = doc.getNodeName();

            if (nv1.equals(n1) && nv2.equals(n2))

            RESULT = nv1.concat(nv2);

          String document_exit = "<?xml version="1.0" encoding="UTF-8"?>"  +

        "<ns0:MT_SJava_Concanat xmlns:ns0=urn:javaMapping.com/Rashmi>" +

        "<Records> <EmployeeID/> <RESULT>" + RESULT + "</RESULT> </Records>";

    TransformerFactory.newInstance().newTransformer().transform(new DOMSource(doc), new StreamResult(document_exit));

        }catch (Exception exception) {

  getTrace().addDebugMessage(exception.getMessage());

  throw new StreamTransformationException(exception.toString());

  }

}

}

BR,

Rashmi