Remove row from table throws ConstraintViolationException - spring-boot

Question

Im having a problem when i want to delete the product from the database, deleting it, it should be removed from all the orders that contain that product. But when i try to do it this is the error i get:
"error_message": "Request processing failed; nested exception is org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [fkbjvki7e3gm7vrphs73g4x7d2g]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement"
This is my Order class:
#Entity
#Table(name="orders")
public class Order{
private #Id
#GeneratedValue
Long id;
#OneToMany(mappedBy = "order", cascade = CascadeType.ALL,orphanRemoval = true)
private List<ProductOrderDetails> orderedProducts = new ArrayList<>();
public void addProduct(Product product, int quantity) {
ProductOrderDetails orderedProduct = new ProductOrderDetails(this,product,quantity);
orderedProducts.add(orderedProduct);
product.getProductOrderDetails().add(orderedProduct);
totalOrderPrice+=product.getPrice()*quantity;
}
public void removeProduct(Product product,int quantity) {
ProductOrderDetails orderedProduct = new ProductOrderDetails( this, product,0);
product.getProductOrderDetails().remove(orderedProduct);
orderedProducts.remove(orderedProduct);
orderedProduct.setOrder(null);
orderedProduct.setProduct(null);
totalOrderPrice-=product.getPrice()*quantity;
}
}
This is my Product class
#Entity
#Table
public class Product {
private #Id
#GeneratedValue
Long id;
private String name;
#OneToMany(mappedBy = "order", cascade = CascadeType.MERGE,orphanRemoval = true)
private List<ProductOrderDetails> productOrderDetails = new ArrayList<>();
}
ProductOrderID
#Embeddable
public class ProdOrderId implements Serializable {
#Column(name = "order_id")
private Long orderId;
#Column(name = "product_id")
private Long productId;
}
Many to many column of Products and Orders
#Entity
#Table
public class ProductOrderDetails implements Serializable{
#EmbeddedId
#JsonIgnore
private ProdOrderId id;
#ManyToOne
#MapsId("orderId")
#JsonIgnore
Order order;
#ManyToOne
#MapsId("productId")
Product product;
private int quantity;
}
This is my controller method
#DeleteMapping("/{id}")
ResponseEntity<?> deleteProduct(#PathVariable Long id)
{
repository.deleteById(id);
return ResponseEntity.noContent().build();
}

Answer 1

I don't think this is doing what you think it's doing:
ProductOrderDetails orderedProduct = new ProductOrderDetails( this, product,0);
product.getProductOrderDetails().remove(orderedProduct);
If you debug your code or check the return value of remove you will find that it is returning false, which means nothing was removed.
You're just creating a new ProductOrderDetails and then trying to remove it from product.getProductOrderDetails(), but it doesn't exist in it. You need to find the right element to remove from that collection.