Duplicate key value from Hibernate when using a sequence for the primary key

Issue

I somestimes see a containt violation when saving a new entity instance to the database.

INFO  [STDOUT] Hibernate: select nextval ('hibernate_sequence')
ERROR [JDBCExceptionReporter] ERROR: duplicate key value violates unique constraint "my_entity_pk"


CREATE TABLE public.my_entity (
     id INTEGER NOT NULL DEFAULT nextval('public.my_entity_id_seq'),
     ...
)


@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name = "id", unique = true, nullable = false)
@NotNull
public int getId() {
      return this.id;
}