Lazy loading not working for session attributes

[rukshan]

Hi!

I have a object(Nomination) in session. When I try to access from the view I'm getting an exception :

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

if the Nomination object was passed as request attribute there is no problem. I dont wont to do that bcos i want to show Nomination details in all my jsp pages like a header

what I want to do is put the Nomination in session and access it from all of my jsp pages.


Nomination.hbm.xml

<hibernate-mapping package="org.sya.domain">

	<class name="Nomination" table="nominations">
	
		<id name="nominationId" column="nomination_id" type="integer">
			<generator class="increment" />
		</id>

		<many-to-one name="nominee" class="Person" column="person_id"/>		
		<many-to-one name="nomineeType" class="NomineeType" column="nominee_type_id" />
		<many-to-one name="category" class="Category" column="category_id" />
		<property name="registeredDate" column="registered_date" type="timestamp"/>
		
	</class>

data-access-config

	<bean id="hibernateTransactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactory" />
	</bean>

	<bean id="baseTransactionProxy" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean" abstract="true">
		<property name="transactionManager" ref="hibernateTransactionManager" />
		<property name="transactionAttributes">
			<props>
				<prop key="insert*">PROPAGATION_REQUIRED</prop>
				<prop key="update*">PROPAGATION_REQUIRED</prop>
				<prop key="delete*">PROPAGATION_REQUIRED</prop>				
				<prop key="*">PROPAGATION_SUPPORTS,readOnly</prop>
			</props>
		</property>
	</bean>

	<bean id="openSessionInViewInterceptor" class="org.springframework.orm.hibernate3.support.OpenSessionInViewInterceptor">
		<property name="sessionFactory" ref="sessionFactory" />
		<property name="singleSession" value="true" />
		<property name="flushModeName" value="FLUSH_NEVER" />
	</bean>

	<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
		<property name="alwaysUseFullPath" value="true" />
		<property name="interceptors">
			<list>
				<ref bean="openSessionInViewInterceptor" />
			</list>
		</property>
		<property name="mappings">
			<props>
				<prop key="/public/index">indexController</prop>
				<prop key="/public/login">loginController</prop>
				<prop key="/public/home">userRedirectController</prop>
				<prop key="/nominee/register">nomineeRegistrationController</prop>
				<prop key="/nominee/registernomination">nominationRegistrationController</prop>
				<prop key="/nominee/switchnomination">switchNominationController</prop>
				<prop key="/nominee/home">nomineeHomeController</prop>
			</props>
		</property>
	</bean>

view.jsp

<c:set var="nomination" value="${sessionScope.NOMINATION}"/>

<c:if test="${nomination ne null}">
	<c:set var="nomineeType" value="${nomination.nomineeType}"/>
	<c:set var="category" value="${nomination.category}"/>
  
        Category : ${category.categoryName}
</c:if>

does any one know the reason for it to behave like this. is there any solution (without lazy="false" in my Nomination.hbm) ?

thanks in advance

[Marten Deinum]

It is never going to work, it only is going to work for the initial request that puts the object in the session. The hibernate session will remain open only for that request. As soon as you move to another page the session to which your object belongs is already closed.

Either put it in the session again for each request (which makes it pretty useless so you want probably to put it at the request) or make it non lazy/i.e eagerly retrieve all the data needed.

[rukshan]

I'll go with 2nd option (eagerly retrieve data)

Thank you for the advice