Difficulty in generating a JSON object in the correct order

I'm trying to generate a JSON object by following this template:

{
    "schemas": [
        "urn:ietf:params:scim:schemas:extension:oracle:2.0:OIG:User",
        "urn:ietf:params:scim:schemas:core:2.0:User",
        "urn:ietf:params:scim:schemas:extension:oracle:2.0:IDM:User",
        "urn:ietf:params:scim:schemas:extension:enterprise:2.0:User"
    ],
    "urn:ietf:params:scim:schemas:extension:oracle:2.0:OIG:User": {
        "userLoginAttemptsCounter": 0,
        "ldapCommonNameGenerated": 0,
        "userPasswordResetAttemptsCounter": 0,
        "ldapCommonName": "System Administrator",
        "passwordWarnDate": "2015-06-30T01:51:27.000-07:00",
        "lastSuccessfulLoginDate": "2015-03-11T00:00:00.000-07:00",
        "homeOrganization": {
            "value": "1",
            "$ref": "http://HOST_NAME:PORT/idaas/im/scim/v1/Organizations/1"
        },
        "passwordPolicyDescription": [
            {
                "value": "Password must not match or contain first name."
            }
        ],
        "disabled": false,
        "dataLevel": "2",
        "organizations": [
            {
                "value": "1",
                "$ref": "http://HOST_NAME:PORT/idaas/im/scim/v1/Organizations/1",
                "display": "Xellerate Users"
            }
        ]
    }

}

but I'm getting this template:

{
    "schema": [
        "urn:ietf:params:scim:schemas:extension:oracle:2.0:OIG:User",
        "urn:ietf:params:scim:schemas:core:2.0:User",
        "urn:ietf:params:scim:schemas:extension:oracle:2.0:IDM:User",
        "urn:ietf:params:scim:schemas:extension:enterprise:2.0:User"
    ],
    "urn:ietf:params:scim:schemas:extension:oracle:2.0:OIG:User": {
        "userLoginAttemptsCounter": 0,
        "ldapCommonNameGenerated": 0,
        "passwordWarnDate": "2015-06-30T01:51:27.000-07:00",
        "homeOrganization": {
            "value": "1",
            "$ref": "http:\HOST_NAME:PORT\idaas\im\scim\v1\Organizations\1"
        },
        "lastSuccessfulLoginDate": "2015-03-11T00:00:00.000-07:00",
        "organizations": [
            {
                "display": "Xellerate Users",
                "value": "1",
                "$ref": "http://HOST_NAME:PORT/idaas/im/scim/v1/Organizations/1"
            }
        ],
        "disabled": false,
        "ldapCommonName": "System Administrator",
        "passwordPolicyDescription": [
            {
                "value": "Password must not match or contain first name."
            }
        ],
        "userPasswordResetAttemptsCounter": 0,
        "dataLevel": "2"
    }
}

My code:

import org.json.JSONException;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;

public class Main {

    public static void main(String[] args) throws JSONException {

        //obj principal
        JSONObject obj = new JSONObject();
        //obj usuario
        JSONObject objuser = new JSONObject();
        objuser.put("userLoginAttemptsCounter", 0);
        objuser.put("ldapCommonNameGenerated", 0);
        objuser.put("userPasswordResetAttemptsCounter", 0);
        objuser.put("ldapCommonName", "System Administrator");
        objuser.put("passwordWarnDate", "2015-06-30T01:51:27.000-07:00");
        objuser.put("lastSuccessfulLoginDate", "2015-03-11T00:00:00.000-07:00");


        JSONObject objcompuser = new JSONObject();
        objcompuser.put("value", "1");
        objcompuser.put("$ref", "http:\HOST_NAME:PORT\idaas\im\scim\v1\Organizations\1");


        objuser.put("homeOrganization", objcompuser);

        JSONObject psw_des = new JSONObject();
        psw_des.put("value", "Password must not match or contain first name.");

        JSONObject org_des = new JSONObject();
        org_des.put("value", "1");
        org_des.put("$ref", "http://HOST_NAME:PORT/idaas/im/scim/v1/Organizations/1");
        org_des.put("display", "Xellerate Users");
        //obj headers
        JSONArray headers = new JSONArray();
        headers.add("urn:ietf:params:scim:schemas:extension:oracle:2.0:OIG:User");
        headers.add("urn:ietf:params:scim:schemas:core:2.0:User");
        headers.add("urn:ietf:params:scim:schemas:extension:oracle:2.0:IDM:User");
        headers.add("urn:ietf:params:scim:schemas:extension:enterprise:2.0:User");
        obj.put("schema", headers);
        obj.put("urn:ietf:params:scim:schemas:extension:oracle:2.0:OIG:User", objuser);

        JSONArray objpass = new JSONArray();
        objpass.add(psw_des);
        JSONArray objorg = new JSONArray();
        objorg.add(org_des);

        objuser.put("passwordPolicyDescription", objpass);
        objuser.put("disabled", false);
        objuser.put("dataLevel", "2");
        objuser.put("organizations", objorg);
        System.out.println(obj.toJSONString());
    }
}

Obs (I'm using the simple-json lib)