How to DOM Parsing JAVA Mapping in SAP PI 7.3

Hi Experts,

I am new to DOM Parsing Java Mapping.For learning purpose I want to do one DOM Parsing,I am working in SAP PI Version 7.3.

My requirement is very simple and I am illustrating that below:

Source Structure is :

DT_Source

>Person1

>Employee

>Name

>Surname

and Target Structure that needs to be generated is as below:

DT_Target

>Person2

>EmpName

>Emp

Emp will be generated by concatenating Name and Surname from Source.

I have written one code which is given below:

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.xml.sax.SAXException;

import com.sap.aii.mapping.api.AbstractTransformation;
import com.sap.aii.mapping.api.StreamTransformationException;
import com.sap.aii.mapping.api.TransformationInput;
import com.sap.aii.mapping.api.TransformationOutput;

public class MergeName extends AbstractTransformation{

public void transform1(TransformationInput arg0, TransformationOutput arg1)
throws StreamTransformationException {
DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
DocumentBuilder dbuilder = null;
try {
dbuilder = factory.newDocumentBuilder();
} catch (ParserConfigurationException e) {

e.printStackTrace();
}
Document doc = null;
try {
InputStream in = null;
doc = dbuilder.parse(in);
} catch (SAXException e) {

e.printStackTrace();
} catch (IOException e) {

e.printStackTrace();
}

doc.getFirstChild();
doc.getChildNodes();




DocumentBuilderFactory.newInstance();
DocumentBuilder dbuilder1 = null;
try {
dbuilder1 = factory.newDocumentBuilder();
} catch (ParserConfigurationException e) {

e.printStackTrace();
}
Document docout=dbuilder1.newDocument();

Node Name;
Node Surname,textChild;
String fullname="";
Element Person2=docout.createElementNS("http://testing", "Person2");
//docout.appendChild(Person2);
Element EmpName=docout.createElement("EmpName");
//Person2.appendChild(EmpName);
Element Emp=docout.createElement("Emp");
EmpName.appendChild(Emp);

Name=(Node) doc.getElementsByTagName("Name").item(0);
Surname=(Node) doc.getElementsByTagName("Surname").item(0);

fullname=Name.getFirstChild().getNodeValue();
fullname+=Surname.getFirstChild().getNodeValue();

textChild=docout.createTextNode(fullname);

Emp.appendChild(textChild);
docout.appendChild(Person2);
Person2.appendChild(EmpName);

Transformer tFormer = null;
try {
tFormer = TransformerFactory.newInstance().newTransformer();
} catch (TransformerConfigurationException e) {

e.printStackTrace();
} catch (TransformerFactoryConfigurationError e) {

e.printStackTrace();
}

Source source = new DOMSource(docout);
OutputStream out = null;
StreamResult result = new StreamResult(out);

try {
tFormer.transform(source, result);
} catch (TransformerException e) {

e.printStackTrace();
}




}

@Override
public void transform(TransformationInput arg0, TransformationOutput arg1)
throws StreamTransformationException {
// TODO Auto-generated method stub

}

//public void setParameter(Map arg0) {


//}

}

But everytime I am executing this I am getting an error that is

" Unable to display tree view; Error when parsing an XML document (Premature end of file.)"

I check the code but not getting where the error is actually.

Please help me in getting the correct code for implementing this.

Thanks and Regards

Joy