How can i wire-up org.springframework.transaction.interceptor.TransactionProxyFactoryBean and org.springframework.orm.hibernate3.HibernateInterceptor ?

Question

I wired-up but it did not work as I expected. I have set the lazy inialization true between entities abd believe,HibernateInterceptor manages the hibernate session. When I trying to access the object properties, it thorws exception LazyInitializationException.

Error messgae : Transaction could not initialize proxy - the owning Session was closed

Stack Trace: org.hibernate.LazyInitializationException: could not initialize proxy - the owning Session was closed
    at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:56)
    at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:98)
    at org.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:158)

configuration xml

<!-- THE HIBERNATE INTERCEPTOR -->
<bean id="hibernateInterceptor" class="org.springframework.orm.hibernate3.HibernateInterceptor">
 <property name="sessionFactory" ref="app:sessionFactory" />
</bean>

<!-- Start Transaction proxy definition -->

<bean id="app:appTransactionProxy"
 class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"
 abstract="true">
 <property name="transactionManager" ref="app:transactionManager" />
 <property name="transactionAttributes">
  <props>
  <prop key="process*">PROPAGATION_REQUIRED,readOnly,
    -Exception,-RuntimeException</prop>
   <prop key="submit*">PROPAGATION_REQUIRED,readOnly,
    -Exception,-RuntimeException</prop>
   <prop key="*">PROPAGATION_REQUIRED,readOnly,
    -Exception,-RuntimeException</prop>
  </props>
 </property>
 <property name="preInterceptors">
  <list>
   <ref bean="hibernateInterceptor" />
  </list>
 </property>
 <property name="postInterceptors">
  <list>
   <ref bean="hibernateInterceptor" />
  </list>
 </property>

</bean>


<bean id="app:daoTransactionProxy"
 class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"
 abstract="true">
 <property name="transactionManager" ref="app:transactionManager" />
 <property name="transactionAttributes">
  <props>
   <prop key="unlock*">PROPAGATION_REQUIRES_NEW,
    -Exception,-RuntimeException</prop>
   <prop key="getHead*">PROPAGATION_REQUIRES_NEW,
    -Exception,-RuntimeException</prop>
   <prop key="remove*">PROPAGATION_REQUIRES_NEW,
    -Exception,-RuntimeException</prop>
   <prop key="create*">PROPAGATION_REQUIRES_NEW,
    -Exception,-RuntimeException</prop>
   <prop key="update*">PROPAGATION_REQUIRES_NEW,
    -Exception,-RuntimeException</prop>
   <prop key="addTail*">PROPAGATION_REQUIRES_NEW,
    -Exception,-RuntimeException</prop>
   <prop key="checkForTimeouts">PROPAGATION_REQUIRED,
    -Exception,-RuntimeException</prop>
   <prop key="breakOldLocks">PROPAGATION_REQUIRES_NEW,
    -Exception,-RuntimeException</prop>
   <prop key="find*">PROPAGATION_REQUIRES_NEW,readOnly,
    -Exception,-RuntimeException</prop>
   <prop key="load*">PROPAGATION_REQUIRES_NEW,readOnly,
    -Exception,-RuntimeException</prop>
   <prop key="*">PROPAGATION_REQUIRED,readOnly,
    -Exception,-RuntimeException</prop>

  </props>
 </property>
  <property name="preInterceptors">
  <list>
   <ref bean="hibernateInterceptor" />
  </list>
 </property>
 <property name="postInterceptors">
  <list>
   <ref bean="hibernateInterceptor" />
  </list>
 </property>
</bean>

<bean id="app:transactionManager" name="transactionManager"
 class="org.springframework.orm.hibernate3.HibernateTransactionManager">

 <property name="sessionFactory" ref="app:sessionFactory" />
 <property name="nestedTransactionAllowed" value="true" />
</bean>

    <bean id="app:sessionFactory" name="sessionFactory"
 class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">

 <property name="dataSource" ref="app:dataSource" />

 <property name="mappingResources">
  <list>
   <value>com/app/domain/app.hbm.xml</value>
   <value>com/common/domain/shared.hbm.xml</value>
  </list>
 </property>

 <property name="hibernateProperties">
  <props>
   <prop key="hibernate.dialect">
    ${app.hibernate.dialect}
   </prop>
   <prop key="hibernate.show_sql">false</prop>
   <prop key="hibernate.generate_statistics">false</prop>
  </props>
 </property>

 <property name="eventListeners">
  <map>
   <entry key="merge">
    <bean
     class="org.springframework.orm.hibernate3.support.IdTransferringMergeEventListener" />
   </entry>
  </map>
 </property>
</bean>

<!--Start DATA SOURCE   -->
<bean id="app:dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
 destroy-method="close">
 <!-- Config values-->
</bean>

Any input on this ?

Answer 1

ProxyFactoryBean allows to apply particular logic on the bean methods calling. TransactionProxyFactoryBean IS-A ProxyFactoryBean and it allows to apply transaction-management-specific concerns.

LazyInitializationException means that you access hibernate proxy outside of active hibernate session context.

I.e. you set transaction infrastructure, asked hibernate to get a proxy for particular entity and tried to access proxy properties after tranasction completion.

Solution is to retrieve the object eagerly or work with it from transactional context only.