XML : Transforming XML to JSON in Wso2

I am Trying to Transform XML payload to JSON format using WSO2 Proxy service.As part of this I did the following.But I couldn,t recieve the JSON Format response.Could any one help me on this.

I have uuncommented the following message builder and formatter from axis2.xml and axis2_blocking_client.xml of wso2esb-4.9.0\repository\conf\axis2 path

messageBuilder contentType="application/json" class="org.apache.synapse.commons.json.JsonStreamBuilder"

messageFormatter contentType="application/json" class="org.apache.synapse.commons.json.JsonStreamFormatter"

ANd My Proxy is

  <?xml version="1.0" encoding="UTF-8"?>    <proxy xmlns="http://ws.apache.org/ns/synapse"     name="TestXML_To_JSON"     transports="http,https"     statistics="disable"     trace="disable"     startOnLoad="true">       <target>      <inSequence>       <header name="To" action="remove"/>       <property name="RESPONSE" value="true"/>       <property name="NO_ENTITY_BODY" scope="axis2" action="remove"/>       <payloadFactory media-type="xml">          <format>             <person>                <fullName>                   <firstName>Laks</firstName>                   <lastName>M</lastName>                </fullName>                <birthDate>                   <month>May</month>                   <date>31</date>                   <year>2015</year>                </birthDate>                <address>                   <street>test1</street>                   <province>test2</province>                   <city>Colombo</city>                   <country>test3</country>                   <postalCode>0002</postalCode>                </address>             </person>          </format>          <args/>       </payloadFactory>       <property name="messageType"                 value="application/json"                 scope="axis2"                 type="STRING"/>       <send/>    </inSequence>    

I am expecting the response in JSOn Format as key value pairs as I set the property messageType as application/json.But when I tenst this Proxy it gives the output as follows...... JSONObject

               <jsonObject>                 <person>                <fullName>                   <firstName>Laks</firstName>                   <lastName>M</lastName>                </fullName>                <birthDate>                   <month>May</month>                   <date>31</date>                   <year>2015</year>                </birthDate>                <address>                   <street>test1</street>                   <province>test2</province>                   <city>Colombo</city>                   <country>test3</country>                   <postalCode>0002</postalCode>                </address>             </person>             </jsonObject>    

Please help me how to configure my proxy or message builder and formatters to get the response as actual JSOn format as Key valuye pairs.

Thanks, Lakshmi