Avoid JSON removing child object - json

Question

I'm writing a Spring application with Hibernate framework.
In my application there is a JSON call. In that JSON response returns object hierarchy like below:
Object
SupplyBatch
Farmer
This farmer has attributes such as ID, Name, Address and contact.
First object of array list it returns all there attributes and child objects are filled with relevant data. But the problem is that farmer is in second or third or in any other supply batch, that farmer is returned as an attribute in supply batch called "Farmer" with value of farmer's ID.
But when I loop that object in controller it print all the farmer's name. I can't figure out what is this behavior. Here are the screenshots of sample objects.
This is the json response in my controller
#RequestMapping(value = {"admin/getTaskByDate","user/getTaskByDate"}, method = RequestMethod.GET)
public #ResponseBody List<Task> getTaskByDate(#RequestParam("date") String date) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date dat = null;
try {
dat = sdf.parse(date);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
List<Task> tasksByDate = taskService.getFeedIssueTasksByDate(dat);
for(Task t : tasksByDate)
{
System.out.println("Farmers-"+t.getSupplyBatch().getFarmer().getName());
}
return tasksByDate;
}
and following is the code in jsp page which calls this json response
<script>
function getTaskById(){
var date = $('#inputDate').val();
$("#tblTask").find("tr:gt(0)").remove();
var sid = this.value;
$.ajax({
url : 'http://localhost:8080/jp/user/getTaskByDate.json?date='+date+'',
success : function(data) {
console.log(data);
for(var i = 0; i < data.length; i++) {
var obj = data[i];
var act;
var dt = new Date(obj.duedate);
if(obj.type == "Feed Issuing")
{
act='<td>Issue Feed</td>'
}
else
{
act='<td>Catch</td>';
}
$('#tblTask tr:last').after('<tr><td>'+obj.taskId+'</td><td>'+dt+'</td><td>'+obj.status+
'</td><td>'+obj.supplyBatch.supplyBatchId+'</td><td>'+obj.supplyBatch.farmer.name+'</td><td>'+obj.feedType+'</td><td>'+obj.quantity+'</td>'+act+'</tr>');
}
}
});
return false;
}