HIbernate 5: generator class=“sequence” not working

Question

I have following mapping:

Answer 1

I also encountered this problem when migrating from Hibernate 4.3.10 to Hibernate 5.0.4. Like maksim2020, I replaced instances of with . However, to preserve the id sequence for the affected tables I also had to write a sql migration script which set the default value for the column to be the next value of the existing sequence. In PostgreSQL this is done as follows:

ALTER TABLE ONLY affected_table ALTER COLUMN affected_id SET DEFAULT nextval('original_sequence'::regclass);