FetchType.LAZY

[danjourno]

I have an entity called commission that has a property of supplier with the reference to this object set up as below

 @ManyToOne(fetch=FetchType.LAZY)
 @JoinColumn(nullable=false, name="supplier_id")
 public Supplier getSupplier() {
 return supplier;
 }

I also have a Stateless session bean called PersistenceManager that as you probably guessed manages all the persistence operations for my entity beans.

Then I have another sesison bean that uses this PersistenceManager to retrieve an instance of the Commission object.

when I try to get the supplier object attached to this Commission object with

commission.getSupplier();

I get the following..

org.hibernate.LazyInitializationException: could not initialize proxy - no Session

Any ideas as to why I cannot "get" an attached entity that has a fetch type of LAZY?

Regards
Dan

[ejb3workshop]

Are you calling commission.getSupplier(); on the client side or within the session bean ?

If you are calling it on the client side you will get a LazyException as you are trying to access an object outside of it's persistent context. In this case to fix the problem you will need to either:
1.) fetch the associated objects within the session bean and return both to the client
2.) Set the type to EAGER if the two objects are closely related. (Composition Relationship ???)

I hope this helps. If you have further input please send it.

Alex
ejb3workshop.com
Video Podcasts on EJB3

[cyril.joui]

For more informations you can look at :
http://jboss.com/index.html?module=bb&op=viewtopic&t=75525

Good luck

[pvanonselen]

Check persistence.xml under JBOSS_HOME/server/all/ejb3.deployer/META-INF.

When release_mode is on after_transaction it closes the session after each JDBC statement.

Resolve problem by uising on_close or just comment the line containing the following line

hibernate.connection.release_mode=after_statement

See Chapter 4 of Hibernate 3 reference guide 4.Configuration for more details

[cyril.joui]

Hello,

I think, you can overload it in your persistence.xml of your .par file