LazyInitializationException using OpenSessionInViewFilter

[blacksmith]

Hi everyone.

I´ve spent various days trying to resolve this problem but I can´t find a solution in the forum. I hope you can help me.

Application with Struts 1.3.9 - Hibernate 3.2.6 - Spring 2.5.6 running on Tomcat 5.5.26

I´d like to implement an open session in view pattern using OpenSessionInViewFilter. The problem is a LazyInitializationException I can´t understand. I´ve learned that OpenSessionInViewFilter creates an Hibernate session and binds it to the Thread. This way, classes like HibernateTemplate and HibernateTransactionManager doesn´t have to worry about creating, flushing and closing Hibernate sessions.

However, it looks like HibernateTransactionManager is creating and closing a second Hibernate session. Closing this second Hibernate session is the cause of the LazyInitializationException later, in the view.

Do I have a configuration error?
How can I avoid the creation of the second Hibernate session?

Thanks a lot and sorry if my english is not perfect ;-)

log

DEBUG OpenSessionInViewFilter:239 - Using SessionFactory 'mySessionFactory' for OpenSessionInViewFilter
DEBUG DefaultListableBeanFactory:214 - Returning cached instance of singleton bean 'mySessionFactory'
DEBUG OpenSessionInViewFilter:181 - Opening single Hibernate Session in OpenSessionInViewFilter
DEBUG SessionFactoryUtils:318 - Opening Hibernate Session
DEBUG TransactionSynchronizationManager:186 - Bound value [org.springframework.orm.hibernate3.SessionHolder@2af8f5] for key [org.hibernate.impl.SessionFactoryImpl@1a4181c] to thread [http-8080-Processor24]
DEBUG DelegatingActionUtils:166 - DelegatingActionProxy with mapping path '/resultado' and module prefix '' delegating to Spring bean with name [/resultado]
DEBUG DefaultListableBeanFactory:214 - Returning cached instance of singleton bean '/resultado'
DEBUG HibernateTransactionManager:371 - Creating new transaction with name [null]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT
DEBUG HibernateTransactionManager:496 - Opened new Session [org.hibernate.impl.SessionImpl@3eec1a] for Hibernate transaction
DEBUG HibernateTransactionManager:507 - Preparing JDBC Connection of Hibernate Session [org.hibernate.impl.SessionImpl@3eec1a]
DEBUG HibernateTransactionManager:572 - Exposing Hibernate transaction as JDBC transaction [org.apache.commons.dbcp.PoolableConnection@1a1ff9]
DEBUG TransactionSynchronizationManager:186 - Bound value [org.springframework.jdbc.datasource.ConnectionHolder@12943ac] for key [org.apache.commons.dbcp.BasicDataSource@cef6f1] to thread [http-8080-Processor24]
DEBUG TransactionSynchronizationManager:186 - Bound value [org.springframework.orm.hibernate3.SessionHolder@19ed7e] for key [org.hibernate.impl.SessionFactoryImpl@1a8402c] to thread [http-8080-Processor24]
DEBUG TransactionSynchronizationManager:261 - Initializing transaction synchronization
DEBUG TransactionSynchronizationManager:142 - Retrieved value [org.springframework.orm.hibernate3.SessionHolder@19ed7e] for key [org.hibernate.impl.SessionFactoryImpl@1a8402c] bound to thread [http-8080-Processor24]
DEBUG TransactionSynchronizationManager:142 - Retrieved value [org.springframework.orm.hibernate3.SessionHolder@19ed7e] for key [org.hibernate.impl.SessionFactoryImpl@1a8402c] bound to thread [http-8080-Processor24]
DEBUG HibernateTemplate:410 - Found thread-bound Session for HibernateTemplate
DEBUG HibernateTemplate:435 - Not closing pre-bound Hibernate Session after HibernateTemplate
DEBUG HibernateTransactionManager:903 - Triggering beforeCommit synchronization
DEBUG HibernateTransactionManager:916 - Triggering beforeCompletion synchronization
DEBUG HibernateTransactionManager:730 - Initiating transaction commit
DEBUG HibernateTransactionManager:651 - Committing Hibernate transaction on Session [org.hibernate.impl.SessionImpl@3eec1a]
DEBUG HibernateTransactionManager:929 - Triggering afterCommit synchronization
DEBUG HibernateTransactionManager:945 - Triggering afterCompletion synchronization
DEBUG TransactionSynchronizationManager:315 - Clearing transaction synchronization
DEBUG TransactionSynchronizationManager:232 - Removed value [org.springframework.orm.hibernate3.SessionHolder@19ed7e] for key [org.hibernate.impl.SessionFactoryImpl@1a8402c] from thread [http-8080-Processor24]
DEBUG TransactionSynchronizationManager:232 - Removed value [org.springframework.jdbc.datasource.ConnectionHolder@12943ac] for key [org.apache.commons.dbcp.BasicDataSource@cef6f1] from thread [http-8080-Processor24]
DEBUG HibernateTransactionManager:730 - Closing Hibernate Session [org.hibernate.impl.SessionImpl@3eec1a] after transaction
DEBUG SessionFactoryUtils:789 - Closing Hibernate Session
DEBUG TransactionSynchronizationManager:232 - Removed value [org.springframework.orm.hibernate3.SessionHolder@2af8f5] for key [org.hibernate.impl.SessionFactoryImpl@1a4181c] from thread [http-8080-Processor24]
DEBUG OpenSessionInViewFilter:207 - Closing single Hibernate Session in OpenSessionInViewFilter
DEBUG SessionFactoryUtils:789 - Closing Hibernate Session

web.xml

	<context-param>
	     <param-name>contextConfigLocation</param-name>
	     <param-value>/WEB-INF/applicationContext.xml</param-value>
	</context-param>
 	
	<filter>
		<filter-name>hibernateFilter</filter-name>
		<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
		<init-param>
			<param-name>singleSession</param-name>
			<param-value>true</param-value>
		</init-param>
		<init-param>
			<param-name>sessionFactoryBeanName</param-name>
			<param-value>mySessionFactory</param-value>
		</init-param>
	</filter>
	
	<filter-mapping>
		<filter-name>hibernateFilter</filter-name>
		<servlet-name>action</servlet-name>
	</filter-mapping>

	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>	

	<servlet>
		<servlet-name>action</servlet-name>
		<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
		<init-param>
			<param-name>config</param-name>
			<param-value>/WEB-INF/struts-config.xml</param-value>
		</init-param>
		<load-on-startup>2</load-on-startup>
	</servlet>	
	
	<servlet-mapping>
		<servlet-name>action</servlet-name>
		<url-pattern>*.do</url-pattern>
	</servlet-mapping>

applicactionContext.xml

	<bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
		<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
		<property name="url" value="jdbc:mysql://localhost/prueba"/>
		<property name="username" value="prueba"/>
		<property name="password" value="prueba"/>
	</bean>
	
	<bean id="mySessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="dataSource" ref="myDataSource"/>
		<property name="mappingResources">
			<list>
				<value>com/strutsHibernateSpring/modelo/Direccion.hbm.xml</value>
				<value>com/strutsHibernateSpring/modelo/Persona.hbm.xml</value>
			</list>
		</property>
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
				<prop key="hibernate.current_session_context_class">thread</prop>
				<prop key="hibernate.cache.provider_class">org.hibernate.cache.NoCacheProvider</prop>
				<prop key="hibernate.show_sql">false</prop>
			</props>
		</property>
	</bean>
	
	<bean id="myTxManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory" ref="mySessionFactory"/>
	</bean>
	
	<bean id="personaDao" class="com.strutsHibernateSpring.dao.PersonaDaoHibernate">
		<property name="sessionFactory" ref="mySessionFactory"/>
	</bean>

	<bean id="logica" class="com.strutsHibernateSpring.logica.Logica">
		<property name="personaDao" ref="personaDao"/>
	</bean>

action-servlet.xml

	<bean name="/resultado" class="com.strutsHibernateSpring.action.ResultadoAction">
		<property name="transactionManager" ref="myTxManager"/>
		<property name="logica" ref="logica"/>
	</bean>

ResultadoAction.java

transactionTemplate.execute(new TransactionCallbackWithoutResult() {
	        public void doInTransactionWithoutResult(TransactionStatus status) {
	    		
	        	DynaActionForm inicioForm = (DynaActionForm) form;
	    		String nombre = inicioForm.getString("nombre");
	    		String id = inicioForm.getString("id");
	    		
	    		Collection<Persona> personas = logica.getPersona(id);
	    		
	    		request.setAttribute("nombre", nombre);
	    		request.setAttribute("personas", personas);	    		
	        }
		});
		
		return mapping.findForward("listado");

Logica.java

	public Collection<Persona> getPersona(String id){

		Collection<Persona> personas;

		if (id!=null && !id.equals("")){
			personas = new ArrayList<Persona>();
			int idInt = Integer.parseInt(id);
			Persona p = personaDao.getPersona(idInt);
			personas.add(p);
		}else{
			personas = personaDao.getPersonas();
		}		
		
		return personas;
		
	}

PersonaDaoHibernate.java

public class PersonaDaoHibernate extends HibernateDaoSupport implements PersonaDaoIntf{
	public Persona getPersona(int id) throws DataAccessException {
		return (Persona)getHibernateTemplate().get(Persona.class, id);
	}

	public Collection<Persona> getPersonas() throws DataAccessException {
		return getHibernateTemplate().loadAll(Persona.class);
	}
}

[blacksmith]

I finally solved the problem (what a nightmare!).

This thread helped me: http://forum.springsource.org/showth...t=35340&page=2

A problem of duplication of contexts!!!!

My application context was initialized twice. One by org.springframework.web.struts.ContextLoaderPlugIn and the other by org.springframework.web.context.ContextLoaderListe ner

I solved the problem replacing (in struts-config.xml):

	<plug-in className="org.springframework.web.struts.ContextLoaderPlugIn">
	  <set-property property="contextConfigLocation"
	      value="/WEB-INF/action-servlet.xml,/WEB-INF/applicationContext.xml"/>
	</plug-in>

with

	<plug-in className="org.springframework.web.struts.ContextLoaderPlugIn"/>