Is an open session required for lazy initialization?

mitchellch · **Joined:** Wed Sep 03, 2003 9:56 pm **Posts:** 58

I have a mildly deep object graph (5 levels), comprised of aproximately 200 objects total. I have a tree control for browsing this heirarchy. When I launch my tree viewer, I only want to see the root nodes. With SQL tracing on, I see that I'm getting the entire object graphs loaded as a result of my session.find().

I have proxies set throughout, and my collections declare lazy="true".

The method that does the lookup looks like this (error processing removed):

Code:

public List findRootNodes() {
  s = SessionManager.getSessionFactory().openSession();
  results = s.find("from RootNode");
  s.close();
  return results
}

Is there something else I need to do to get the objects to load only when I access them (i.e. keep the session open during user browsing)?

Thanks.

FWIW, this is a thick-client application talking directly to the database.

christian · **Posted:** Wed Feb 18, 2004 6:42 pm

Pick one:

- You have to keep the Session open (several strategies)
- You initialize all required lazy collections and proxies manually before you close the Session
- You can eagerly fetch all required data with an HQL query before closing
- You can reattach (by calling lock() or update, see the API documentation) an object to a new (second) Session when a view is rendered