Getting null value while unmarshalling an XML String

[mohana krishna]

I am trying to convert XML String to Java object using JaxB Unmarshall.
But when I print the values I am getting the null values.
I have tried values options like using annotation @XmlElement at field , getter and setter level.
Added @XmlAccessorType(XmlAccessType.FIELD).
Added constructor.

But nothing works.

This is my XML String I am trying to convert to Java object.

<ns0:Response xmlns:ns0="http://www.citi.com/fps/clearingswitch/outward/clearingswitchresponse"> <ns0:MessageType>0210</ns0:MessageType> <ns0:RetrvlRefNmbr>331917000008</ns0:RetrvlRefNmbr> <ns0:ResponseCode>00</ns0:ResponseCode> </ns0:Response>

My Response java object is

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name="Response" ,namespace="http://www.citi.com/fps/clearingswitch/outward/clearingswitchresponse")
@XmlAccessorType(XmlAccessType.FIELD)
public class Response
{
	public Response(){
		super();
	}
	
	public Response(String messageType,String retrvlRefNmbr,String responseCode){
		this.MessageType= messageType;
		this.RetrvlRefNmbr=retrvlRefNmbr;
		this.ResponseCode=responseCode;
	}
	//private static final long serialVersionUID = 1L;
	
	private String MessageType; 
	private String RetrvlRefNmbr; 
	private String ResponseCode;
	@XmlElement
	public String getMessageType() {
		return MessageType;
	}
	public void setMessageType(String messageType) {
		this.MessageType = messageType;
	}
	@XmlElement
	public String getRetrvlRefNmbr() {
		return this.RetrvlRefNmbr;
	}
	public void setRetrvlRefNmbr(String retrvlRefNmbr) {
		this.RetrvlRefNmbr = retrvlRefNmbr;
	}
	@XmlElement
	public String getResponseCode() {
		return this.ResponseCode;
	}
	public void setResponseCode(String responseCode) {
		this.ResponseCode = responseCode;
	}
	
	
}

My Unmarshalling code is

import java.io.StringReader;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;

public class Xml2Object {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		JAXBContext objJaxbContext = null;
		String xmlString = "<ns0:Response xmlns:ns0=\"http://www.citi.com/fps/clearingswitch/outward/clearingswitchresponse\"><ns0:MessageType>0210</ns0:MessageType><ns0:RetrvlRefNmbr>331917000008</ns0:RetrvlRefNmbr><ns0:ResponseCode>00</ns0:ResponseCode></ns0:Response>";
		try{
			objJaxbContext = JAXBContext.newInstance(Response.class);
			Unmarshaller unmarshaller =  objJaxbContext.createUnmarshaller();
			Response objProcessResponse =(Response)unmarshaller.unmarshal(new StringReader(xmlString));
			System.out.println(objProcessResponse);
			System.out.println("MessageType  -->"+objProcessResponse.getMessageType());
			System.out.println("ResponseCode -->"+objProcessResponse.getResponseCode());
			System.out.println("RetrvlRefNmbr-->"+objProcessResponse.getRetrvlRefNmbr());		
		}catch(Exception e){
			System.out.println(e.toString());
		}

	}

}

After executing the Xml2Object class I am getting the following output.

com.nucleus.lk.util.Response@1629346 MessageType  -->null ResponseCode -->null RetrvlRefNmbr-->null

Can you please help to resolve the issue why null values were printed.