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haraldschauer
 Post subject: Hibernate & Spring / Lazy Collactions, Hibernate.initial
PostPosted: Mon Jan 17, 2005 6:49 pm 
Newbie

Joined: Mon Jan 17, 2005 5:14 pm
Posts: 1
Location: Austria
Hello,

I am new to Hibernate and I'm sorry, if this has been asked before - but I did search the forum but I still can't get my

problem fixed.

First of all, I'm running Hibernate in a Web Application using the Spring framework which handles my Hibernate SessionFactory

and Transaction Management.

applicationContext.xml (Spring)
Code:
<beans>
...
   <!-- dataSource -->
   <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
           <property name="driverClassName"><value>${jdbc.driverClassName}</value></property>
           <property name="url"><value>${jdbc.url}</value></property>
           <property name="username"><value>${jdbc.username}</value></property>
           <property name="password"><value>${jdbc.password}</value></property>
   </bean>

   <!-- Hibernate SessionFactory -->
   <bean id="sessionFactory" class="org.springframework.orm.hibernate.LocalSessionFactoryBean">
      <property name="dataSource"><ref local="dataSource"/></property>
      <property name="mappingDirectoryLocations">
         <list>
            <value>classpath:/org/mmo/model/hbm</value>
         </list>
      </property>
      <property name="hibernateProperties">
      <props>
         <prop key="hibernate.dialect">${jdbc.dialect}</prop>
         <prop key="hibernate.show_sql">true</prop>
      </props>
      </property>
   </bean>

   <!-- Transaction manager for a single Hibernate SessionFactory (alternative to JTA) -->
   <bean id="transactionManager" class="org.springframework.orm.hibernate.HibernateTransactionManager">
      <property name="sessionFactory"><ref local="sessionFactory"/></property>
   </bean>
...
   <!-- Daos -->
...
</beans>


In my model, I'm mapping a bi-directional association using this notation:
Code:
<class name="org.mmo.model.SchuelerMatura">
...
    <set name="fachklausuren" inverse="true" lazy ="true" cascade="all" >
        <key column="Schueler_MaturaID" />
        <one-to-many class="org.mmo.model.SchuelerFachklausur"/>

    </set>
...
</class>


respectively

Code:
<class name="org.mmo.model.SchuelerFachklausur">
...
    <!-- bi-directional many-to-one association to SchuelerMatura -->
       <many-to-one name="schuelerMatura" class="org.mmo.model.SchuelerMatura" column="Schueler_MaturaID"/>
...
</class>


Now, when I load a collection of SchuelerMatura-entities using my Dao-Class
Code:
public Collection getSchuelerMaturaByClassAgeGroupId(String classAgeGroupId) {
   Collection c = getHibernateTemplate().find("select sm from SchuelerMatura sm , " +
         "Schueler s, " +
         "SchuelerKlasse k " +
         "where sm.schueler.schuelerId = s.schuelerId and " +
         "s.schuelerId = k.schueler.schuelerId and " +
         "k.klasseJahrgang.klasseJahrgangId = ? and " +
         "sm.berechtigt = '1' " +
         "order by k.katalogNr", classAgeGroupId);
        /*Collection c = getHibernateTemplate().find("select sm from SchuelerMatura sm , " +
            "Schueler s, " +
            "SchuelerKlasse k inner join fetch sm.fachklausuren " +
            "where sm.schueler.schuelerId = s.schuelerId and " +
            "s.schuelerId = k.schueler.schuelerId and " +
            "k.klasseJahrgang.klasseJahrgangId = ? and " +
            "sm.berechtigt = '1' " +
            "order by k.katalogNr", classAgeGroupId); */
        try {
            for (Iterator it = c.iterator(); it.hasNext(); ) {
                SchuelerMatura sm = (SchuelerMatura) it.next();
         // trying to initialize the lazy collection (set)
                        Hibernate.initialize(sm.getFachklausuren());
            }
        } catch(HibernateException hex) {
            log.error(hex.getMessage());
        }

        return c;
}


I get either a LazyInitializationException like this

ERROR - LazyInitializationException.<init>(25) | cannot access loading collection
net.sf.hibernate.LazyInitializationException: cannot access loading collection
at net.sf.hibernate.collection.PersistentCollection.initialize(PersistentCollection.java:191)
at net.sf.hibernate.collection.PersistentCollection.read(PersistentCollection.java:71)
at net.sf.hibernate.collection.Set.hashCode(Set.java:383)
at org.apache.commons.lang.builder.HashCodeBuilder.append(HashCodeBuilder.java:392)
at org.apache.commons.lang.builder.HashCodeBuilder.reflectionAppend(HashCodeBuilder.java:353)
at org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:327)
at org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:194)
at org.mmo.model.BaseObject.hashCode(BaseObject.java:40)
at org.apache.commons.lang.builder.HashCodeBuilder.append(HashCodeBuilder.java:392)
at org.apache.commons.lang.builder.HashCodeBuilder.reflectionAppend(HashCodeBuilder.java:353)
at org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:327)
at org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:194)
at org.mmo.model.BaseObject.hashCode(BaseObject.java:40)
at java.util.HashMap.hash(HashMap.java:257)
at java.util.HashMap.put(HashMap.java:375)
at java.util.HashSet.add(HashSet.java:188)
at java.util.AbstractCollection.addAll(AbstractCollection.java:315)
at net.sf.hibernate.collection.Set.endRead(Set.java:244)
at net.sf.hibernate.impl.SessionImpl.endLoadingCollections(SessionImpl.java:3078)
at net.sf.hibernate.impl.SessionImpl.endLoadingCollections(SessionImpl.java:3065)
at net.sf.hibernate.loader.Loader.doQuery(Loader.java:243)
at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:133)
at net.sf.hibernate.loader.Loader.loadCollection(Loader.java:915)
at net.sf.hibernate.loader.Loader.loadCollection(Loader.java:890)
at net.sf.hibernate.loader.OneToManyLoader.initialize(OneToManyLoader.java:93)
at net.sf.hibernate.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:284)
at net.sf.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:3264)
at net.sf.hibernate.collection.PersistentCollection.forceInitialization(PersistentCollection.java:336)
at net.sf.hibernate.Hibernate.initialize(Hibernate.java:256)
at

org.mmo.dao.SchuelerMaturaDaoHibernateImpl.getSchuelerMaturaByClassAgeGroupId(SchuelerMaturaDaoHibernateImpl.java:46)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.springframework.aop.framework.AopProxyUtils.invokeJoinpointUsingReflection(AopProxyUtils.java:59)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:149)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:118)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:191)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:138)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:148)
at $Proxy0.getSchuelerMaturaByClassAgeGroupId(Unknown Source)
at org.mmo.web.FachklGenAction.execute(FachklGenAction.java:109)
at org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:131)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:449)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:264)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1176)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:454)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:142)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:58)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:536)


or - when I do not use Hibernate.initialize() to initialize my the collection - I get an LazyInitializationException telling

me that no Session was found, respectively the Session was closed.

After researching this issue, I thought Hibernate.initialize() provides the solution for this problem.

I've also seen approaches using HQL to fetch the collection data via inner joins like
Code:
getHibernateTemplate().find("select sm from SchuelerMatura sm , " +
   "Schueler s, " +
   "SchuelerKlasse k [b]inner join fetch sm.fachklausuren [/b]" +
   "where sm.schueler.schuelerId = s.schuelerId and " +
   "s.schuelerId = k.schueler.schuelerId and " +
   "k.klasseJahrgang.klasseJahrgangId = ? and " +
   "sm.berechtigt = '1' " +
   "order by k.katalogNr", classAgeGroupId);


but it did not work for me, either.

One thing that might be of interest is, that I'm joining over 2 MS SQL catalogs and I therefore get a SQLWarning which I'm not

familiar with, I have to admit:

DEBUG - SessionImpl.afterTransactionCompletion(585) | transaction completion
DEBUG - JDBCTransaction.toggleAutoCommit(103) | re-enabling autocommit
DEBUG - SessionImpl.close(573) | closing session
DEBUG - SessionImpl.disconnect(3332) | disconnecting session
DEBUG - JDBCExceptionReporter.logWarnings(18) | SQL Warning
java.sql.SQLWarning: [Microsoft][SQLServer 2000 Driver for JDBC]Database changed to svs
at com.microsoft.jdbc.base.BaseWarnings.createSQLWarning(Unknown Source)
at com.microsoft.jdbc.base.BaseWarnings.get(Unknown Source)
at com.microsoft.jdbc.base.BaseConnection.getWarnings(Unknown Source)
at net.sf.hibernate.impl.BatcherImpl.closeConnection(BatcherImpl.java:289)
at net.sf.hibernate.impl.SessionImpl.disconnect(SessionImpl.java:3348)
at net.sf.hibernate.impl.SessionImpl.close(SessionImpl.java:576)
at org.springframework.orm.hibernate.SessionFactoryUtils.closeSessionIfNecessary(SessionFactoryUtils.java:350)
at org.springframework.orm.hibernate.HibernateTransactionManager.doCleanupAfterCompletion(HibernateTransactionManager.java:478)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.cleanupAfterCompletion(AbstractPlatformTransactionManager.java:510)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:351)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:211)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:138)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:148)
at $Proxy1.getClasses(Unknown Source)
at org.mmo.web.FachklGenAction.execute(FachklGenAction.java:99)
at org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:131)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:449)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:264)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1176)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:454)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:142)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:58)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:536)
WARN - JDBCExceptionReporter.logWarnings(20) | SQL Warning: 0, SQLState:
WARN - JDBCExceptionReporter.logWarnings(28) | [Microsoft][SQLServer 2000 Driver for JDBC]Database changed to svs
WARN - JDBCExceptionReporter.logWarnings(20) | SQL Warning: 5701, SQLState: 01000
WARN - JDBCExceptionReporter.logWarnings(28) | [Microsoft][SQLServer 2000 Driver for JDBC][SQLServer]Changed database context to 'svs'.
WARN - JDBCExceptionReporter.logWarnings(20) | SQL Warning: 0, SQLState:
WARN - JDBCExceptionReporter.logWarnings(28) | [Microsoft][SQLServer 2000 Driver for JDBC]Language changed to us_english
WARN - JDBCExceptionReporter.logWarnings(20) | SQL Warning: 5703, SQLState: 01000
WARN - JDBCExceptionReporter.logWarnings(28) | [Microsoft][SQLServer 2000 Driver for JDBC][SQLServer]Changed language setting to us_english.
DEBUG - SessionImpl.afterTransactionCompletion(585) | transaction completion
DEBUG - FachklGenAction.execute(103) | Maturaklassen:[org.mmo.model.svs.KlasseJahrgang@11bf785[klasseJahrgangId=170], org.mmo.model.svs.KlasseJahrgang@19c86c5[klasseJahrgangId=171], org.mmo.model.svs.KlasseJahrgang@1542cdc[klasseJahrgangId=173], org.mmo.model.svs.KlasseJahrgang@14d4313[klasseJahrgangId=172]]
DEBUG - SessionImpl.<init>(555) | opened session

This occurs after a collection is read by getHibernateTemplate().find("...") by one of my several Dao-Classes.

Due to using Spring I'm actually not managing the SessionFactory through a Singleton class like described in the Hibernate Documentation, and so I'm worried about how to keep the Session alive, when using the lazy collections - i thought using Hibernate.initialize() solves the problem nicely, but aparantly it doesn't - or did i make a major mistake applying it?

Hibernate version: 2.1.4

I'd greatly appreciate any help!
Thanks!
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 Profile  
 
rdeguzman55
 Post subject:
PostPosted: Fri Feb 11, 2005 3:41 am 
Newbie

Joined: Mon Jan 17, 2005 7:32 am
Posts: 13
I have the same problem except that I'm using List and one-to-many relation and my exception is:
[junit] ERROR - LazyInitializationException.<init>(25) | Failed to lazily initialize a
collection - no session or session was closed

this usually occurs when I run my JUnit test case. I follow the procedure from Karl Baum's Website: http://www.jroller.com/comments/kbaum/W ... o#comments

This is the contents of my applicationContext.xml:
<!-- Lazy Initialization here -->
<bean id="urlMapping"
class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="interceptors">
<list>
<ref bean="openSessionInViewInterceptor"/>
</list>
</property>
</bean>

<bean name="openSessionInViewInterceptor"
class="org.springframework.orm.hibernate.support.OpenSessionInViewInterceptor">
<property name="sessionFactory"><ref bean="sessionFactory"/></property>
</bean>

<bean id="hibernateInterceptor" class="org.springframework.orm.hibernate.HibernateInterceptor">
<property name="sessionFactory">
<ref bean="sessionFactory"/>
</property>
</bean>

<bean id="userTargetWorker" parent="txProxyTemplate">
<property name="target">
<bean class="UserWorkerImpl">
<property name="userDAO"><ref bean="userDAO"/></property>
</bean>
</property>
</bean>

<bean id="userWorker" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target"><ref bean="userTargetWorker"/></property>
<property name="proxyInterfaces">
<value>UserWorker</value>
</property>
<property name="interceptorNames">
<list>
<value>hibernateInterceptor</value>
</list>
</property>
</bean>


and my xdoclet mapping:
/**
* @hibernate.list
* cascade="all" inverse="true" lazy="true"
* @hibernate.collection-one-to-many
* class="UserActivity"
* @hibernate.collection-index
* column="USER_ACTIVITY_INDEX"
* @hibernate.collection-key
* column="FK_USER_ID"
* @return array of UserActivityVO
*/
public List getUserActivity() {
return userActivity;
}

and the result of the generation:
<list
name="ewars"
lazy="true"
inverse="true"
cascade="all"
>
<key
column="FK_USER_ID"
>
</key>
<index
column="USER_ACTIVITY_INDEX"
/>
<one-to-many
class="UserActivity"
/>
</list>


I don't know what's wrong in my code here... Please us...
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 Profile  
 
rdeguzman55
 Post subject:
PostPosted: Fri Feb 11, 2005 5:00 am 
Newbie

Joined: Mon Jan 17, 2005 7:32 am
Posts: 13
I solve my problem finally.... after searching through the net the answer lies in:

protected void setUp() throws Exception {
super.setUp();
userDao = (UserDAO) ctx.getBean("userDAO");
accountDao = (AccountDAO) ctx.getBean("accountDAO");

sessionFactory = (SessionFactory) ctx.getBean("sessionFactory");
Session session = SessionFactoryUtils.getSession(sessionFactory, true);
TransactionSynchronizationManager.bindResource(sessionFactory, new SessionHolder(session));
}

protected void tearDown() throws Exception {
super.tearDown();
userDao = null;
accountDao = null;

// unbind and close the session.
SessionHolder holder = (SessionHolder) TransactionSynchronizationManager.getResource(sessionFactory);
Session s = holder.getSession();
s.flush();
TransactionSynchronizationManager.unbindResource(sessionFactory);
SessionFactoryUtils.closeSessionIfNecessary(s, sessionFactory);
}
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