Instead of response.getEntity(), use response.readEntity(String.class) or response.readEntity(HttpEntity.class).

Client Processing code

package net.test;import java.util.HashMap;import org.codehaus.jettison.json.JSONException;import org.codehaus.jettison.json.JSONObject;import com.sun.jersey.api.client.Client;import com.sun.jersey.api.client.ClientResponse;import com.sun.jersey.api.client.WebResource;public class Consumer {    public static void main(String[] args) {        Client client = Client.create();        ClientResponse clientResponse = null;        User u = new User();        u.setUsername("hello");        u.setPassword("hello");        WebResource webResource = client            .resource("http://localhost:8080/"+appName"+/logins");        HashMap<String, String> userMap = new HashMap<String, String>();        userMap.put("username", u.getUsername());        userMap.put("password", u.getPassword());        // JSON logins request!        JSONObject jsonLoginRequest = new JSONObject();        try {            jsonLoginRequest.put("login-request", userMap);            System.out.println(jsonLoginRequest.get("login-request"));            System.out.println(jsonLoginRequest.getJSONObject("login-request")                .get("username"));        } catch (JSONException e) {            e.printStackTrace();        }       // POST Operation       clientResponse = webResource.post(ClientResponse.class,            jsonLoginRequest);       System.out.println(jsonLoginRequest);    // Send the return value in object       String result = clientResponse.getEntity(String.class);       System.out.println(result); }}

Server Processing Code

package net.test;//Server Processing codeimport java.util.HashMap;import java.util.Random;import javax.ws.rs.Consumes;import javax.ws.rs.POST;import javax.ws.rs.Path;import javax.ws.rs.Produces;import javax.ws.rs.core.Context;import javax.ws.rs.core.MediaType;import javax.ws.rs.core.Response;import org.codehaus.jettison.json.JSONException;import org.codehaus.jettison.json.JSONObject;@Path("/")public class Producer {   @POST   @Path("logins")   @Consumes(MediaType.APPLICATION_JSON)   @Produces(MediaType.APPLICATION_JSON)   public Response generateToken(String objInputData) {    JSONObject jsonObject = null;    User user = null;    String username = null;    String password = null;    try {        jsonObject = new JSONObject(objInputData);        user = new User();        username = jsonObject.getJSONObject("login-request")                .get("username").toString();        password = jsonObject.getJSONObject("login-request")                .get("password").toString();        // Your business logic goes here        // DBHandshaker handshaker = DBHandshaker.getInstance();        // user = handshaker.logUser(username, password);        System.out.println(username+password);        if (user != null) {            // write your logic to generate token            // StringUtil stringUtil = StringUtil.getInstance();            // String tokenString =            // stringUtil.encryptForToken(user.getUsername(),            // user.getPassword());            // dummy string to test            String tokenString = "Helllllllllgjdkg";            HashMap<String, String> tokenMap = new HashMap<String, String>();            tokenMap.put("token", tokenString);            JSONObject jsonLoginResponse = new JSONObject();            try {                jsonLoginResponse.put("login-token", tokenMap);            } catch (JSONException e) {                e.printStackTrace();            }            return Response.ok(jsonLoginResponse.toString(),                    MediaType.APPLICATION_JSON).build();        } else {            return Response.status(Response.Status.UNAUTHORIZED).build();        }    } catch (Exception e1) {        return Response.status(Response.Status.NO_CONTENT).build();    }}}

Write catcher logic after getting the response

hope this answer is helpful for you