I wanted to show the number of items in a certain category and what I get is a LazyInitializationException (failed to lazily initialize a collection of role – no session or session was closed). It seems that because the fetch mode for the collection items is lazy, the session is not available anymore when I actually need it.
The solution is to add an interceptor to the UrlHandlerMapping in the dispatcher servlet like so:
<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="interceptors"> <list> <ref bean="openSessionInViewInterceptor" /> </list> </property>
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That interceptor is a OpenSessionInViewInterceptor which will make the session available in the view layer.
<bean name="openSessionInViewInterceptor" class="org.springframework.orm.hibernate3.support.OpenSessionInViewInterceptor"> <property name="sessionFactory"> <ref bean="sessionFactory" /> </property> </bean>