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 Post subject: Fields not retrieved on Lazy Fetching+OpenSessionInView+JSF
PostPosted: Thu Nov 30, 2006 10:30 am 
Newbie

Joined: Thu Nov 30, 2006 9:48 am
Posts: 1
General cenario:
Lazy + Open Session in View filter pattern + Request scope + JSF


I have a cenario where there are many large and composed objects (many-to-one, one-to-many, many-to-many and so on). So i need hibernate lazy fetching to avoid memory overcharge on collections retrieval. In all the cases, those collections are retrieved by some DAO, on methods like:


Code:
public Collection <LCR> getAll() throws ExceptionDAO {
      Session session = DAOHibernateFactory.getSession();
      try {         
         List<LCR> lcrs = session .createCriteria(LCR.class).list();   
         return lcrs;
      } catch (Exception e) {
                        //on except, rollback and recreate session
         DAOHibernateFactory.recreateHibernateSession();
         throw new ExceptionDAO (e.getMessage());
      }
   }


To present all LCR´s, im using JSF DataTable, but mysteriously, some fields are not showed when should be. Those fields, are exactly the fields that should be automatically retrieved by Hibernate on demand (what i understand that should be lazy fetching). When i change the hibernate mappings and put
Code:
lazy="false"
and
Code:
session.flush()
before
Code:
return lcrs;
, them it works (the correct sqls are executed and the fields are retrieved from underlying classes) .

What is wrong? Im thinking wrong about Lazy fetching?


Hibernate version:
3.2.1.ga
Mapping documents:
Relevant fields:
Hibernate.cfg

Code:
<property name="hibernate.transaction.factory_class">
org.hibernate.transaction.JDBCTransactionFactory
</property>     
<property name="current_session_context_class">thread</property>         


Name and version of the database you are using:
HSQLDB


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