Java EE - Return 415 status

Question

I'm creating an WEB Api with Java and Jersey and now i get 415 status code on a POST request to my API.

The request made by Postman with the Header Content-type application/json

These images show my request

And that is my code.

package api;

import java.sql.SQLException;
import java.util.List;
import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

import DAO.TransactionDAO;
import DAO.UsersDAO;
import Entity.Transaction;
import Entity.Users;

@Path("/users")
public class UsersController {

    private UsersDAO dao;
    private static final String CHARSET = ";charset=UTF-8";
    @PostConstruct
    private void init(){
    this.dao = new UsersDAO();
}

@POST
@Path("/add")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.TEXT_PLAIN)
public int insert(Users user){              
try{
        return this.dao.add(user);      
    }
    catch(Exception e){
        e.toString();
        return 0;
    }
    }
}

Answer 1

I found the error. My model didn't have an empty constructor. I just create it and work.