CODEWITHSUNDEEP
javajqueryjsonweb-servicesrest
mzereba
mzereba

Reputation: 2517

No response back from REST WS called by jQuery/JSON

I know there is a lot of these posts but I couldn't really get this to work since I am new to both REST and JQuery:

I am using REST-WS with Java 5 and I am able to call it and get result back with "Poster" ,the firefox plugin to test it. When I call the URL below I should get the employee in order '0' in the map by calling the method "getCustomer" in the resource class shown below.

Although I am not able to get the result and getting an error "unknown "using jQuery and returning JSON when I call the REST from an html page with body as below:

<body>
        jQuery to REST <br><br>

       <a href="http://jquery.com/">jQuery</a>
       <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js"></script>
       <script>
         $(document).ready(function(){

            $("button").click(function (){
                $.ajax({
                    type: "GET",
                    url: "http://localhost:8081/RestDemo/services/customers/0",
                    dataType: "json",
                    success: function (data) {
                        alert(data.name);
                    },
                    error: function(e){  
                        alert("Error: " + e);  
                    } 
                });
             });

         });
       </script>
       <br>
       <br>
       <button>Return Customer</button>

      </body>

This is my Resource class:

package com.myeclipseide.ws;

import java.util.ArrayList;
import java.util.List;
import java.util.TreeMap;

import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

import com.sun.jersey.spi.resource.Singleton;

@Produces("application/xml")
@Path("customers")
@Singleton
@XmlRootElement(name = "customers")
public class CustomerResource {

    private TreeMap<Integer, Customer> customerMap = new TreeMap<Integer, Customer>();

    public  CustomerResource() {
        // hardcode a single customer into the database for demonstration
        // purposes
        Customer customer = new Customer();
        customer.setName("Harold Abernathy");
        customer.setAddress("Sheffield, UK");
        addCustomer(customer);
    }

    @GET
    @XmlElement(name = "customer")
    public List<Customer> getCustomers() {
        List<Customer> customers = new ArrayList<Customer>();
        customers.addAll(customerMap.values());
        return customers;
    }

    @GET
    @Path("/{id}")
    @Produces("application/json")
    public String getCustomer(@PathParam("id") int cId) {
        return  "{\"name\": \"unknown\", \"address\": -1}"; //customerMap.get(cId); 

    }

    @POST
    @Path("add")
    @Produces("text/html")
    @Consumes("application/xml")
    public String addCustomer(Customer customer) {
         int id = customerMap.size();
         customer.setId(id);
         customerMap.put(id, customer);
         return "Customer " + customer.getName() + " added with Id " + id;
    }

}

I appreciate anyone's help,

Thanks!

Upvotes: 2

Views: 1098

Answers (2)

mzereba
mzereba

Reputation: 2517

I got it!

Returning {"name": "unknown", "address": -1} is right because that's exactly what is hard coded in my method return,

so i replaced return "{\"name\": \"unknown\", \"address\": -1}"; simply with a correct form which is 

return  "{\"name\": \" " + customer.getName() + " \", \"address\": \"" + customer.getAddress() + "\"}";

and obviously it works!

Thanks everyone.

Upvotes: 1

Stephen C
Stephen C

Reputation: 719446

I appreciate anyone's help,

If you are stumped, take a look at what is in the web countainer's log files. If necessary, turn on debug logging.

The next thing would be to use your web browser's built-in "web developer" support to see what request is actually being sent.

Upvotes: 0

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