Unable to parse JSON object to Java Object in Springs Controller

Question

I am wrestling with this JSON to Java Object conversion. Here is my client side JavaScript code where it sends the JSON to Ajax call.

var college = {
        collegeName : $("#collegeNameID").val(),
        estYear : $("#estYear").val(),
        universityOrBoardName : $("#university").val(),
        website : $("#webSite").val()
    };
    var address = { 
        city    :  $("#cityID").val(),
        district:  $("districtID").val()
    };
    ajaxResult = $.ajax({
        url : urls,
        async : false,
        cache : false,
        type : "POST",
        dataType : "json",
        contentType : "application/json",
        mimeType : "application/json",
        data : JSON.stringify({ College : college, Address: address}),
        mimeType : "application/json",
        success : function(result) {
        return result;
    }

Here is my Pojo class which are mapped to the respective JSON.

Address.java

private String district;
private String city;
    (there are other member variables for which I will not be getting the input from the Client side. I will be setting those in server side)

College.java

private String collegeName;
private String universityOrBoardName;
private String website;
  (there are other member variables for which I will not be getting the input from the Client side. I will be setting those in server side)

In my Controller code, the string JSON value coming from the Client code is

{"College":{"collegeName":"sfd","universityOrBoardName":"sdd","website":"fdd"}}

My Controller code

CollegeController.java

@RequestMapping(value="/submitCol", method = RequestMethod.POST)
    public  String mycollege(@RequestBody String str,HttpServletRequest req)
    {
             Gson gson=new Gson();
    Type type = new TypeToken<College>(){}.getType();
    College cols=gson.fromJson(str, type);
    System.out.println("College Name "+cols.getCollegeName());//HERE ITS PRINTING NULL

}

So my question is..I am sending two JSONs namely Address, College from Client side and in my controller I am trying to convert them into their respective Java Value Objects( Java Beans). But I am not able to do it. Please help.

The client should not be sending the outer json object, ie. the one containing College. It should only be sending the JSON object named College. — Sotirios Delimanolis
– Sotirios Delimanolis, Commented May 17, 2014 at 5:12
{"collegeName": "sfd", "universityOrBoardName":"sdd","website":"fdd"} is what the controller expects. — Misha
– Misha, Commented May 17, 2014 at 5:15

Pramod S. Nikam · Accepted Answer · 2014-05-17 05:25:55Z

1

Create Class to hold both POJO's say it be RequestCommand:

 class RequestCommand{

      private College college;

      private Address address;

      // follows getter and setter


  }

Your Address and College POJO will automatically be binded inside RequestCommand by Spring Framework to controller method Params like below:

@RequestMapping(value="/submitCol", method = RequestMethod.POST)
public  String mycollege(@ModelAttribute RequestCommand command)
{
      // use both of them here

       command.getCollege();



}

edited May 17, 2014 at 5:25

answered May 17, 2014 at 5:15

Pramod S. Nikam

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2 Comments

Sotirios Delimanolis Over a year ago

Why do you think so and where would Address come from?

Sotirios Delimanolis Over a year ago

Can @ModelAttribute deserialize json?

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