JavaMapping in PI 7.1 Error:Unable to display tree view; Error when parsing

Question

hi,
i get by testing in PI 7.1 (operation mapping) this ERROR:
"Unable to display tree view; Error when parsing an XML document (Content is not allowed in prolog.)"
this is my java-programm-code:
import java.io.FileInputStream;
import java.io.FileOutputStream;
import com.sap.aii.mapping.api.StreamTransformation;
import java.io.*;
import java.util.Map;
import javax.xml.parsers.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;
/*IMPORT statement imports the specified classes and its methods into the program */
/Every Java mapping program must implement the interface StreamTransformation and its methods execute() and setParameter() and extend the class DefaultHandler./
public class Mapping extends DefaultHandler implements StreamTransformation {
Below is the declaration for all the variables we are going to use in the
subsequent methods.
     private Map map;
     private OutputStream out;
     private boolean input1 = false;
     private boolean input2 = false;
     private int number1;
     private int number2;
     private int addvalue;
     private int mulvalue;
     private int subvalue;
     String lineEnd = System.getProperty("line.separator");
setParamater() method is used to store the mapping object in the variable
"map"
     public void setParameter(Map param) {
          map = param;
     public void execute(InputStream in, OutputStream out)
               throws com.sap.aii.mapping.api.StreamTransformationException {
          DefaultHandler handler = this;
          SAXParserFactory factory = SAXParserFactory.newInstance();
          try {
               SAXParser saxParser = factory.newSAXParser();
               this.out = out;
               saxParser.parse(in, handler);
          } catch (Throwable t) {
               t.printStackTrace();
As seen above execute() method has two parameters "in" of type
InputStream and "out" of type OutputStream. First we get a new instance
of SAXParserFactory and from this one we create a new Instance of
SAXParser. To the Parse Method of SaxParser, we pass two parameters,
inputstream "in" and the class variable "handler".
Method "write" is a user defined method, which is used to write the
string "s" to the outpurstream "out".
     private void write(String s) throws SAXException {
          try {
               out.write(s.getBytes());
               out.flush();
          } catch (IOException e) {
               throw new SAXException("I/O error", e);
     public void startDocument() throws SAXException {
          write("");
          write(lineEnd);
          write("");
          write(lineEnd);
     public void endDocument() throws SAXException {
          write("");
          try {
               out.flush();
          } catch (IOException e) {
               throw new SAXException("I/O error", e);
     public void startElement(String namespaceURI, String sName, String qName,
               Attributes attrs) throws SAXException {
          String eName = sName;
          if ("".equals(eName))
               eName = qName;
          if (eName.equals("NUMBER1"))
               input1 = true;
          if (eName.equals("NUMBER2"))
               input2 = true;
     public void endElement(String namespaceURI, String sName, String qName)
               throws SAXException {
          String eName = sName;
          if ("".equals(eName))
               eName = qName;
          if (eName.equals("NUMBER1"))
               input1 = false;
          if (eName.equals("NUMBER2"))
               input2 = false;
     public void characters(char[] chars, int startIndex, int endIndex)
               throws SAXException {
          String dataString = new String(chars, startIndex, endIndex).trim();
          if (input1) {
               try {
                    number1 = Integer.parseInt(dataString);
               } catch (NumberFormatException nfe) {
          if (input2) {
               number2 = Integer.parseInt(dataString);
          if (input2 == true) {
               addvalue = number1 + number2;
               mulvalue = number1 * number2;
               subvalue = number1 - number2;
               write("" + addvalue + "");
               write(lineEnd);
               write("" + mulvalue + "");
               write(lineEnd);
               write("" + subvalue + "");
               write(lineEnd);
in developer studio 7.1 i dont get error.
this happens by testing the mapping-programm in ESR.
can somebody help me please?

Answer 1

Make sure that the xml created out after the java mapping is a valid xml with only one root node.
Regards,
Prateek