Hibernate JoinColumn Error on not null constraint

Question

Here\'s a list of my classes

@MappedSuperclass
public abstract class JpaModel {

    @Id
    @Column(name =\"ID\", columnDefinition = \"serial\")
    @Genera         


        

Answer 1

From your log, it shows id=null, which is not related to inventoryItemPicture at all.

The issue is at @GeneratedValue(strategy = GenerationType.IDENTITY)

Your log shows you are using postgresql, but "IDENTITY" can only be used for these dbs:

• Sybase, My SQL, MS SQL Server, DB2 and HypersonicSQL.

You should use GenerationType.SEQUENCE, which is supported by:

• Oracle, DB2, SAP DB, Postgre SQL or McKoi.

Try change your code to this:

@GeneratedValue(strategy = GenerationType.SEQUENCE)