Get list of JPA/Hibernate Persisted objects

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Hello, how do I get the list of persisted objects before committing it in BD. Follow the example below:

Pessoa p = new Pessoa("Joao", 21);
Pessoa p2 = new Pessoa("Pedro", 17);
Pessoa p3 = new Pessoa("Maria", 32);

//Entendo que nesse momento os dados ainda não estão salvos no banco
//Preciso obter essa lista para alterar as propriedades de alguns objetos
manager.persist(p);
manager.persist(p2);
manager.persist(p3);


//Comitando para salvar no banco
manager.getTransation().begin();
manager.getTransation().commit();
java hibernate jpa

  • Your objects are in the scope of the method, why do you need their list? If you need the id generated in persistence, the method persiste returns the id.

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If you want the ID, you need to open the transaction before the persist. You can get the persist ID this way by using the flush():

manager.getTransation().begin();

manager.persist(p);
manager.persist(p2);
manager.persist(p3);

//depois do flush, p, p2 e p3 terão os IDs
manager.flush();

//Comitando para salvar no banco
manager.getTransation().commit();

Or, you can get their Ids after the commit:

manager.getTransation().begin();

manager.persist(p);
manager.persist(p2);
manager.persist(p3);

//Comitando para salvar no banco
manager.getTransation().commit();

//depois disto, p, p2 e p3 terão os IDs

I recommend avoiding flush usage whenever possible. If your intention is just to get the Ids, do this after the commit().

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