Question

I got the famous LazyInitializationException.

I have an object User which is stored in the session. This object contains an other object Market which is lazy initialized.
When I load the user in the session, I don’t load Market because it is too heavy and I don’t need it everytime.

When I want to load the market, I am in a different transaction and I don’t want to reload the user from the database. How can I retrieve the Market object? Knowing that User.market contains the Hibernate proxy and so the id of the market and that I don’t want to hack Hibernate using reflection.

That would be even better if I could load the market without loading it into the user. Since the user is in the session, I don’t want to put a lot of stuff in the session.

A JPA compatible solution would be even better.

Cheers

Answer 1

What you have to do is to annotate the accessors instead of the fields. This will allow you to avoid loading of the market object when you initially load the user, but you will have access to the id of the market from the Hibernate proxy object without triggering a lazy loading or getting a LazyInitializationException. Then later on when you want to load the market itself you do a normal entity retrieval based on its id. You can read a detailed explanation of how this works here.