Lazyinitialization

[mrwhite]

Hi everybody,
i want to deliver a objectgraph for my swing app wich is connected over spring http remoting.

as i dont want to give up the lazy loading performance gains i want to intialize the object graph before sending it to the client.

I have a Dao that is accessed by the remote server with the following method:

public Catalog getRootCatalog() {
		Catalog rootCatalog = (Catalog) getHibernateTemplate().get(Catalog.class,new Long(1));
		getHibernateTemplate().initialize(rootCatalog.getCatalogs());
		return rootCatalog;
	}

The first call getHibernateTemplate().get(Catalog.class,new Long(1)); works without any problems. But when it call getHibernateTemplate().initialize(rootCatalog.getC atalogs());
i get a lazy initialization exeception:

org.springframework.orm.hibernate3.HibernateSystem Exception: disconnected session; nested exception is org.hibernate.HibernateException: disconnected session
org.hibernate.HibernateException: disconnected session

I use declarative transactions:
<bean id="baseTransactionProxy" class="org.springframework.transaction.interceptor .TransactionProxyFactoryBean" abstract="true">
<property name="transactionManager"><ref bean="transactionManager"/></property>
<property name="transactionAttributes">
<props>
<prop key="get*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="find*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="load*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="store*">PROPAGATION_REQUIRED</prop>
</props>
</property>
</bean>


<bean id="trans4" parent="baseTransactionProxy">
<property name="target" ref="catalogDAO" />
</bean>


I also tried to set:
<prop key="initialize*">PROPAGATION_REQUIRED,readOnly</prop>
Without any success.

I would be very happy if someone could help me.

[mrwhite]

Hi,
when i use the following code everything works:

public Catalog getRootCatalog() {
Session session = SessionFactoryUtils.getSession(getSessionFactory(),true);
		Catalog rootCatalog = (Catalog) session.get(Catalog.class,new Long(1));
		initializeCatalog(rootCatalog);
		
		return rootCatalog;
	}
	
	public void initializeCatalog(Catalog catalog)
	{
		Hibernate.initialize(catalog);
		Hibernate.initialize(catalog.getDocuments());
		for (Catalog nextCatalog : catalog.getCatalogs()) {
			initializeCatalog(nextCatalog);
		}
	}

Any hints?

[manifoldronin]

I think somehow the getRootCatalog() method isn't picked up by the transaction proxy, although I can't see from what you posted why not - with "get*" and all.

You can probably confirm that with this in your second version:

Session session = SessionFactoryUtils.getSession(getSessionFactory(),false);