Difference between creating dao object with constructor and by EJB injection

Question

I would like to know the difference between creating an DAO Object with constructor like :

myDaoObject = new MyDaoObject();

and creating it by EJB injection :

@EJB
MyDaoObject myDaoObject;

Is there a difference in the running and/or performance ? thanks.

possibly duplicate http://stackoverflow.com/questions/7662501/is-it-deemed-bad-practice-to-inject-the-dao-into-the-constructor-and-if-so-why — Muhammad, Aug 28 '13 at 09:18
You seem to have completely missed the point of EJBs. This is not just like decoration. I suggest to carefully read this answer: http://stackoverflow.com/a/18379228 — BalusC, Aug 28 '13 at 12:36

score 4 · Accepted Answer · answered Aug 28 '13 at 09:18

Well...you really can't create EJBs with constructor because you would lose the functionality offered by the container (dependency injection, pooling, calling of @PostConstruct, transactions, ...). So only correct way is

@EJB
MyDaoObject myDaoObject;

P.S. Or, in case you are using CDI, @Inject instead of @EJB

Difference between creating dao object with constructor and by EJB injection

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