JpaRepository save value always returns null - mysql

Question

I am trying to post using JpaRepository and spring boot and mysql
I have a table that looks like this
+----------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------+--------------+------+-----+---------+----------------+
| id | varchar(255) | NO | PRI | NULL | |
| user | int(11) | NO | | NULL | |
+----------+--------------+------+-----+---------+----------------+
Whenever i try to save data the column user is always 0 no matter what value i pass.
My Model class looks like this
#Entity
#Table(name = "cart")
public class Cart {
#Id
#Column(name = "id", unique = true, nullable = false)
private String id;
#Column(name = "user")
private Integer user;
// getters and setters
}
The repository looks like this
#Repository
public interface CartRepository extends JpaRepository<Cart, String> {
}
The controller looks like this
#RequestMapping("/api/v1/cart")
#RestController
public class CartController {
#Autowired
CartRepository cartRepository;
#PostMapping(value = "/postCart")
public String postCart(#RequestBody Cart cart){
cartRepository.save(cart);
return "Success";
}
}

Answer 1

Something is strange. Your id field is a String, yet in the DB its a int(11). It should be a variation of varchar. Regarding that user change it's type from int to Integer. A int cannot be null so it probably gives it the value 0.
Try also to recreate your DB model so that you are 100% sure it's matching your entity model.