Spring Controller 400 (Bad Request)

I am getting bad request issue from spring controller. Below is my rest call :

Rest Method

 @RequestMapping(value="/addItem", method = RequestMethod.POST,headers="Accept=application/json")
 public  @ResponseBody String createItem(@RequestBody Item item) {

     ItemDAO itemDAO=new ItemDAO(item);      

     try{
         itemDAO.createProduct();
         return "Success";
     }catch(Exception e){  
         System.out.println("Exception occured in item update");
         e.printStackTrace();
         return "Exception occured in item add";
     }  

 }

Markup

 <div data-ng-show="show=='addProduct'">  
      <p class="{{errorClass}}">{{newProductError}}</p> 
      <h2>Add an Item</h2>
      <form class="form-horizontal" role="form">
        <div class="form-group">
          <label class="control-label col-sm-2" for="email">Item Name</label>
          <div class="col-sm-10">
            <input  class="form-control"  placeholder="Item Name" ng-model="newItem.itemName">
          </div>
        </div>
        <div class="form-group">
          <label class="control-label col-sm-2" for="email">Item Description</label>
          <div class="col-sm-10">
            <input  class="form-control"  placeholder="Item Description" ng-model="newItem.itemDescription">
          </div>
        </div>
        <div class="form-group">
          <label class="control-label col-sm-2" for="email">Item Price</label>
          <div class="col-sm-10">
            <input  class="form-control" type="number" placeholder="Item Price"  ng-model="newItem.itemPrice">
          </div>
        </div>
        <div class="form-group">
          <label class="control-label col-sm-2" for="pwd">Item Discount</label>
          <div class="col-sm-10">          
            <input type="number" class="form-control" id="pwd" placeholder="Item Discount" ng-model="newItem.itemDiscount">
          </div>
        </div>

        <div class="form-group">
          <label class="control-label col-sm-2" for="pwd">Item Quantity</label>
          <div class="col-sm-10">          
            <input type="number" class="form-control" id="pwd" placeholder="Item Quantity" ng-model="newItem.itemQuantity">
          </div>
        </div>
        <div class="form-group">
          <label class="control-label col-sm-2" for="email">Item Category</label>
          <div class="col-sm-10">
            <input  class="form-control"  placeholder="Item Category" ng-model="newItem.categoty">
          </div>
        </div>
        <div class="form-group">        
          <div class="col-sm-offset-2 col-sm-10">
            <button type="submit" class="btn btn-success" ng-click="addItem();">Submit</button>
          </div>
        </div>
      </form>
  </div>

Service

addItem: function(item){
    return $http({
        method : 'POST',
        url : '/Ecomm-Java-Backend/item/addItem',
        data: item,
        heades:{
            'Content-type': 'application/json'
        }
    }).success(function(result){
        console.log(result.length);
        console.log("result success "+ result);
        return result;
    }).error(function(err){
        console.log("result success "+ err);
        return err;
    });     
}

When I invoke the rest call , I'm getting bad request error.

What could be the issue here? Any help would appreciated.