How to introduce multi-column constraint with JPA annotations?

Question

I am trying to introduce a multi-key constraint on a JPA-mapped entity:

public class InventoryItem {
    @Id
    private Long id;

    @Version 
    private          


        

Answer 1

As already answered, multi-column index can be added using @Table annotation. However, columnNames needs to be the name of actual DB columns, not the class attribute. So, if the column is like the following:

@Column(name="product_id")
Long productId;

Then the @Table annotation should be like the following

@Table(uniqueConstraints=
       @UniqueConstraint(columnNames = {"product_id", "serial"})