java - hibernate proxy object after system.out -

i'm new hibernate , have problem.

if this:

session sesion = hibernateutil.getsessionfactory().opensession(); transaction tx = sesion.begintransaction();  obj = (a) session.load(a.class,id); system.out.println(obj);  tx.commit(); session.close(); return obj; 

there no problem , gui shows object's data.

but if this:

session sesion = hibernateutil.getsessionfactory().opensession(); transaction tx = sesion.begintransaction();  obj = (a) session.load(a.class,id);  // don't use system.out.println(obj);  tx.commit(); session.close(); return obj; 

the gui doesn't show , got following exception.

org.hibernate.lazyinitializationexception: not initialize proxy - no session

i've been reading api it's whole new world me. knows what's going on?

instead of using session.load(..), need use session.get(..)

a obj = (a) session.get(a.class,id); 

the session.load(..) lazy loads object using proxy, hence if object not accessed (in example using system.out.println) object stays uninitialised. when uninitialised object accessed outside hibernate session (called detached object), lazyinitializationexception generated - proxy object has no way of retrieving properties of object hibernate session.

the session.get(..) doesn't lazy load object, still accessible outside session. there few other nuances of get vs load, thus, highly recommend visit following post difference:

understanding vs load: http://razshahriar.com/2009/01/hibernate-load-vs-get-differences/