Java Mapping Using DOM Parser.

Hi Experts,

I am new to Java mapping and i have followed the link
http://scn.sap.com/thread/3173071 and it is working fine. It is for only one item. I have tried to modify the code and i placed a for loop to go create the Output Node based on the No of Input Nodes and it is giving the error as below. But my requirement is
Input.xml : -

<?xml version="1.0" encoding="UTF-8" ?>  
<ns0:DT_Source xmlns:ns0="urn:java_mapping2"> 
<Person1> 
      <Name>Alex</Name>  
      <Surname>Stewart</Surname>  
</Person1>
<Person1> 
      <Name>Sam</Name>  
      <Surname>Abdreson</Surname>  
</Person1>  
</ns0:DT_Source>

Output.xml:-

<?xml version="1.0" encoding="UTF-8" standalone="no"?> 
<ns0:DT_Target xmlns:ns0="urn:java_mapping2"> 
<Person2> 
     <EmpName> 
          <Emp>Alex Stewart</Emp> 
</EmpName> 
</Person2>
<Person2> 
     <EmpName> 
          <Emp>Sam Abdreson</Emp> 
</EmpName> 
</Person2>  
</ns0:DT_Target> 

I am unable to get the output. I am getting the following error.

org.w3c.dom.DOMException: HIERARCHY_REQUEST_ERR: An attempt was made to insert a node where it is not permitted.
at com.sun.org.apache.xerces.internal.dom.CoreDocumentImpl.insertBefore()
at com.sun.org.apache.xerces.internal.dom.NodeImpl.appendChild()

Please suggest me how i can resolvoe this error.

Regards,
GIRIDHAR