Transaction mgmt - am I missing something?

[itamar.hedgehocpoker]

Hi,

I'm developing a spring/struts2/hibernate app, and deploying on tomcat.

I'm using tx:annotation-driven, and marking my service methods with @Transactional. I was under the impression that this is binding me to a sesion context. in one of my service methods, I have some persistent object (which was retrieved from a dao, using an injected session factory), but when I'm accessing a collection, I still get the hibernate lazy instansiation exception (no session or session was closed). do I need to do anything else to have a session to work with?

Thanks

[itamar.hedgehocpoker]

Hi,

(moderator, you can delete the root post and put this one instead)

My problem now is a little more focused.

I'm using annotation driven transactions. I have a transactional service method, which accept a dettached object from the fromt end.

if I'm using session.merge to re-attache my object, I get a lazy instantiation exception when asking a 'lazy' collection.

If I'm re-reading the object by Id, everything seems to work.

does this behaviour make sense?

Thanks in advance

[patelmiral]

Not sure about exact problem you are facing, but I will recommend you to google for "Session In View" pattern, to overcome with lazy init and detached objects problems.

[kbutler]

Good question - you probably know about the docs already

https://www.hibernate.org/42.html

http://static.springsource.org/sprin...on-declarative

But try using the OpenSessionInViewFilter

http://static.springsource.org/sprin...iewFilter.html -- google for configuration details, it's just a filter in your web.xml that attaches the HBM session as a threadlocal, as I recall, and closes after Filter processing is complete. Seems to work for most people, but I am not sure how well it behaves well with JTA. Having issues there myself.