Valid JSON not converted to XML (4.5.1 and 4.5.2)

{
    "user": {
        "userId": 12347664,
        "userName": "xxx@gmail.com",
        "emailAddress": "xxx@gmail.com",
        "firstName": "some",
        "lastName": "TEMP",
        "defaultProfileId": 873112
    },
    "account": {
        "type": "FREE",
        "features": []
    },
    "currentProfileId": 873112,
    "userProfiles": [
        {
            "profileId": 873112,
            "name": "Default Profile",
            "profileTypeId": 1
        }
    ],
    "parentProfiles": [
        {
            "profileId": 873112,
            "name": "Default Profile",
            "profileTypeId": 1
        }
    ]
}

<Not JSON content>

<data contentType="null" contentLength="383"><![CDATA[{"user":{"userId":12347664,"userName":"xxx@gmail.com","emailAddress":"xxx@gmail.com","firstName":"some","lastName":"TEMP","defaultProfileId":873112},"account":{"type":"FREE","features":[]},"currentProfileId":873112,"userProfiles":[{"profileId":873112,"name":"Default Profile","profileTypeId":1}],"parentProfiles":[{"profileId":873112,"name":"Default Profile","profileTypeId":1}]}]]></data>

HTTP/1.1 200 OK
Date: Thu, 27 Jun 2013 12:47:21 GMT
Server: Apache/2.4.3 (Unix) OpenSSL/1.0.0-fips mod_jk/1.2.37
Set-Cookie: JSESSIONID=D0A0B36C6E071D5F1043E5DC4D7EC453.worker4; Path=/
Set-Cookie: ORIGINAL_PATH=""; Domain=.domain.com; Expires=Thu, 01-Jan-1970 00:00:10 GMT; Path=/
Content-Length: 383
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive

{"user":{"userId":12347664,"userName":"xxx@gmail.com","emailAddress":"xxx@gmail.com","firstName":"some","lastName":"TEMP","defaultProfileId":873112},"account":{"type":"FREE","features":[]},"currentProfileId":873112,"userProfiles":[{"profileId":873112,"name":"Default Profile","profileTypeId":1}],"parentProfiles":[{"profileId":873112,"name":"Default Profile","profileTypeId":1}]}