arraylist objects returning null

1//in my case my model class had an empty constructor
2
3
4//don't
5public Item(String img_loc, String name, String price) {
6       
7    }
8    
9// do
10public Item(String img_loc, String name, String price) {
11        this.img_loc = img_loc;
12        this.name = name;
13        this.price = price;
14    }