I have the following in my Entity class

 
@Id @GeneratedValue(strategy= GenerationType.IDENTITY)

And in order to populate my primary key in my Oracle  database I have a trigger like the following

CREATE OR REPLACE TRIGGER DOCUMENTS_BI
   BEFORE INSERT
   ON documents
   FOR EACH ROW
DECLARE
BEGIN
   SELECT NVL (MAX (doc_id), 0) + 1 INTO :NEW.doc_id FROM documents;
END;
/

As per this disussion(https://community.jboss.org/thread/188775)

GenerationType.IDENTITY, generator = "system-uuid") 

can be used.

As I do not have any sequence or rawtohex(sys_guid()), what is value to provided for generator =

Any help is highly appreciated.

Thanks