post request with multiple parameters JSON and String on Jackson/Jersey JAVA

I've created a rest api using Jersey/Jackson and it works well. I want to adjust my POST methods to receive a string token in addition to the POJO they are receiving as JSON. I've adjusted one of my methods like so:

@POST
@Path("/user")
@Consumes(MediaType.APPLICATION_JSON)
public Response createObject(User o, String token) {
    System.out.println("token: " + token);
    String password = Tools.encryptPassword(o.getPassword());
    o.setPassword(password);
    String response = DAL.upsert(o);
    return Response.status(201).entity(response).build();

}

I want to call that method, but for whatever reason token prints to null no matter what I try. Here is the client code I've written to send the post request:

public String update() {

    try {
        com.sun.jersey.api.client.Client daclient = com.sun.jersey.api.client.Client
                .create();
        WebResource webResource = daclient
                .resource("http://localhost:8080/PhizzleAPI/rest/post/user");

        User c = new User(id, client, permission, reseller, type, username,
                password, name, email, active, createddate,
                lastmodifieddate, token, tokentimestamp);
        JSONObject j = new JSONObject(c);
        ObjectMapper mapper = new ObjectMapper();

        String request = mapper.writeValueAsString(c) + "&{''token'':,''"
                + "dog" + "''}";
        System.out.println("request:" + request);
        ClientResponse response = webResource.type("application/json")
                .post(ClientResponse.class, request);
        if (response.getStatus() != 201) {
            throw new RuntimeException("Failed : HTTP error code : "
                    + response.getStatus());
        }

        System.out.println("Output from Server .... \n");
        String output = response.getEntity(String.class);
        setId(UUID.fromString(output));
        System.out.println("output:" + output);