java - catch oracle sequence and set it to another field in JPA -


an enity bean has generated sequence id (oracle primary key). need catch sequence somehow on persist , set field. example:

class entity {     @id long id;     @column long parentid; }

the idea make parentid same id generated oracle if empty. example:

@prepersist void prepersist() {     if (parentid = 0) parentid = id; // id not yet generated }

currently use db trigger achieve this, can done in jpa (preferably without hibernate specific classes)?

when persist entity in jpa, our entity object become managed, , @ point should have id populated. pre-persist, not post-persist, not have id populated.


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