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Forum locked This topic is locked, you cannot edit posts or make further replies.  [ 5 posts ] 
Author Message
 Post subject: Hibernate Interceptor: getEntity Problem !!
PostPosted: Thu Oct 26, 2006 3:08 pm 
Newbie

Joined: Thu May 25, 2006 9:45 am
Posts: 7
I am working on an application, where I have a hibernate Interceptor to handle the cache object (if an object is available in the cache then return it to the hibernate else put it in to cache for later use).

The Hibernate interceptor:

The getEntity method returns the Fully initialized object if it is available in cache otherwise it returns null. When getEntity method returns null, onLoad will be called and object will be put in the cache for future use. onLoad of interceptor will not be called when getEntity returns the fully initialized object from cache.

I have an object Track (maps to an hbm file) and can have many track_states (TrackState is another entity and maps to many-to-one relationship in Track.hbm.xml mapping file.

I was using the lazy initializtion for "trackstate". I tried changing the "TrackState" lazy initialization to false, but I get the same "Unknown Entity" error with different stack trace.


Hibernate configuration file


Code:
<!-- Hibernate Session -->
   <bean id="tranxSessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
      <property name="dataSource" ref="tranxDataSource" />
      <property name="lobHandler" ref="oracleLobHandler" />
      <property name="entityInterceptor" ref="modDateInterceptor" />
      <property name="eventListeners">
            <map>
                <entry key="merge">
                    <bean class="org.springframework.orm.hibernate3.support.IdTransferringMergeEventListener"/>
                </entry>
            </map>
        </property>
      <property name="mappingResources">
         <list>
            <value>hibconf/Track.hbm.xml</value>
         ...
                                                ...
   <value>hibconf/Color.hbm.xml</value>
         </list>
      </property>
      <property name="hibernateProperties">
         <props>
            <prop key="hibernate.cache.provider_class">org.hibernate.cache.TreeCacheProvider</prop>
            <prop key="hibernate.cache.use_query_cache">true</prop>
            <prop key="hibernate.dialect">org.hibernate.dialect.Oracle9Dialect</prop>
            <prop key="hibernate.show_sql">false</prop>
            <prop key="hibernate.format_sql">false</prop>
            <prop key="hibernate.use_sql_comments">false</prop>
            <prop key="hibernate.generate_statistics">true</prop>
            <prop key="hibernate.jdbc.batch_size">64</prop>
            <prop key="hibernate.default_batch_fetch_size">64</prop>
            <prop key="hibernate.connection.release_mode">after_transaction</prop>
            <prop key="hibernate.transaction.flush_before_completion">true</prop>
            <prop key="hibernate.transaction.auto_close_session">true</prop>
            <prop key="hibernate.transaction.factory_class">org.hibernate.transaction.JTATransactionFactory</prop>
            <prop key="hibernate.transaction.manager_lookup_class">org.hibernate.transaction.WeblogicTransactionManagerLookup</prop>

            <prop key="hibernate.max_fetch_depth">4</prop>
         </props>
      </property>
   </bean>



The interceptor code:

Code:
   

public Object getEntity(String entityName,
                            Serializable id)
    {
   // Need to cache only the TrackState items.
        if ( entityName.equalsIgnoreCase("TrackState"))
        {
            Object obj = getCacheEntity(key);
            return obj;
        }
    }

     // This method will be called when getEntity returns null
     // after checking that item doesn't exist in cache.
     public boolean onLoad(Object entity, Serializable id,
                   Object[] state, String[] propertyNames,
                   Type[] types)
    {
        String key = id.toString();
        return isEntityInCache(entity, id, state, propertyNames,
                            types, key);
    }

    public boolean isEntityInCache(Object entity, Serializable id,
                                   Object[] state, String[] propertyNames,
                                   Type[] types, String key)
    {
        if ( entity instanceof TrackState )
        {
            try
            {
                for (int ix =0; ix < propertyNames.length; ix++)
                {
                        logger.warn(" ---- Setting **" + propertyNames[ix] + "**"
                                    +" to : -- " + state[ix] );
         // Setting all the properties for the TrackState object.
                        PropertyUtils.setProperty(entity, propertyNames[ix], state[ix]);
                }
               
                // Putting the entity in to cache for the corresponding key.
                switchTreeCache.put("switch-1", key, entity);
            }
            catch (IllegalAccessException e)
            {
                e.printStackTrace();
            }
            catch (InvocationTargetException e)
            {
                e.printStackTrace();
            }
            catch (NoSuchMethodException e)
            {
                e.printStackTrace();
            }
            catch (CacheException e)
            {
                e.printStackTrace();
            }
       // Returning true.
            return true;
        }
        else
        {
            return false;
        }
    }

    public Object getCacheEntity(String key)
    {
        Object obj = null;
        try
        {
            obj = switchTreeCache.get("switch-1", key);
            if (obj != null)
            {
      // Item exists in the cache, return the same
                return obj;
            }
        }
        catch (CacheException e)
        {
            e.printStackTrace();
        }

   // Item doesn't exist in the cache, return null.
        return obj;
    }



track.hbm.xml

Code:
<hibernate-mapping package="com.uss.domain">

   <!-- Track -->
   <joined-subclass name="Track" entity-name="Track" table="track_device" extends="SVGable">
      <key column="track_device_id" />

      <property name="name" type="string" column="track_name" />
      <property name="lastModified" type="timestamp" column="last_mod_date_ts" />
      <property name="created" type="timestamp" column="create_date_ts" />

      <many-to-one name="state" entity-name="TrackState" column="track_device_id" insert="false" update="false" lazy="false" fetch="select"/>
   </joined-subclass>

   <!-- TrackState -->
   <class name="TrackState" entity-name="TrackState" table="track_state" lazy="false">
      <id name="id" type="long" column="track_device_id">
         <generator class="foreign">
            <param name="property">state</param>
         </generator>
      </id>

      <property name="decoration" type="string" column="decoration" />
      <property name="requestedPath" type="long" column="requested_path_id" />
      <property name="lastModified" type="timestamp" column="last_mod_date_ts" />
      <property name="created" type="timestamp" column="create_date_ts" />

      <many-to-one name="foregroundColor" column="foreground_color_id" class="Color" lazy="false"/>

      <many-to-one name="backgroundColor" column="background_color_id" class="Color" lazy="false"/>
   </class>




The stack trace when laxy initialization is set to false:


org.hibernate.MappingException: Unknown entity: com.uss.domain.TrackState
at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:548)
at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1338)
at org.hibernate.event.def.DefaultLockEventListener.onLock(DefaultLockEventListener.java:50)
at org.hibernate.impl.SessionImpl.fireLock(SessionImpl.java:584)
at org.hibernate.impl.SessionImpl.lock(SessionImpl.java:576)
at org.hibernate.impl.SessionImpl.getEntityUsingInterceptor(SessionImpl.java:482)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromSessionCache(DefaultLoadEventListener.java:428)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:334)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:137)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:177)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:101)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:846)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)
at org.hibernate.type.ManyToOneType.assemble(ManyToOneType.java:196)
at org.hibernate.type.TypeFactory.assemble(TypeFactory.java:404)
at org.hibernate.cache.entry.CacheEntry.assemble(CacheEntry.java:96)
at org.hibernate.cache.entry.CacheEntry.assemble(CacheEntry.java:82)
at org.hibernate.event.def.DefaultLoadEventListener.assembleCacheEntry(DefaultLoadEventListener.java:540)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromSecondLevelCache(DefaultLoadEventListener.java:494)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:356)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:137)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:193)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:101)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:846)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)
at org.hibernate.type.ManyToOneType.assemble(ManyToOneType.java:196)
at org.hibernate.collection.PersistentSet.initializeFromCache(PersistentSet.java:124)
at org.hibernate.cache.entry.CollectionCacheEntry.assemble(CollectionCacheEntry.java:35)
at org.hibernate.event.def.DefaultInitializeCollectionEventListener.initializeCollectionFromCache(DefaultInitializeCollectionEventListener.java:130)
at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:48)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at org.hibernate.collection.PersistentSet.iterator(PersistentSet.java:163)
at com.uss.domain.ControlPoint.getLatestModified(ControlPoint.java:472)
at com.uss.domain.ControlPointGroup.getLatestModified(ControlPointGroup.java:255)
at com.uss.domain.Screen.toSVG(Screen.java:540)
at com.uss.domain.Screen.toSVG(Screen.java:431)
at com.uss.service.TrafficControlServiceImpl.getTracklineOverviewSvg(TrafficControlServiceImpl.java:253)
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:585)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:292)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:155)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:122)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:174)
at $Proxy10.getTracklineOverviewSvg(Unknown Source)
at com.uss.toa.controller.TracklineSvgController.getSVG(TracklineSvgController.java:300)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.springframework.web.servlet.mvc.multiaction.MultiActionController.invokeNamedMethod(MultiActionController.java:351)
at org.springframework.web.servlet.mvc.multiaction.MultiActionController.handleRequestInternal(MultiActionController.java:305)
at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:128)
at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:44)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:684)
at com.uss.web.SwitchDispatcherServlet.doDispatch(SwitchDispatcherServlet.java:142)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:625)
at org.springframework.web.servlet.FrameworkServlet.serviceWrapper(FrameworkServlet.java:386)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:346)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:225)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:127)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:272)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:165)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3153)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:1973)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1880)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1310)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:207)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:179)




Database used:
Oracle 10g

Am I doing something wrong or expecting something, which hibernate can't handle?

Thanks,


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 Post subject: Re: Hibernate Interceptor: getEntity Problem !!
PostPosted: Thu Oct 26, 2006 4:28 pm 
Beginner
Beginner

Joined: Wed Jul 13, 2005 2:18 pm
Posts: 44
[quote="amits2"]

Hibernate configuration file


Code:
<!-- Hibernate Session -->
   <bean id="tranxSessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
...
      <property name="mappingResources">
         <list>
            <value>hibconf/Track.hbm.xml</value>
         ...
                                                ...
   <value>hibconf/Color.hbm.xml</value>
         </list>
      </property>
...
   </bean>



org.hibernate.MappingException: Unknown entity: com.uss.domain.TrackState
at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:548)
at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1338)
at org.hibernate.event.def.DefaultLockEventListener.onLock(DefaultLockEventListener.java:50)
at org.hibernate.impl.SessionImpl.fireLock(SessionImpl.java:584)
at org.hibernate.impl.SessionImpl.lock(SessionImpl.java:576)
at org.hibernate.impl.SessionImpl.getEntityUsingInterceptor(SessionImpl.java:482)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromSessionCache(DefaultLoadEventListener.java:428)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:334)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:137)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:177)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:101)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:846)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)
at org.hibernate.type.ManyToOneType.assemble(ManyToOneType.java:196)
at org.hibernate.type.TypeFactory.assemble(TypeFactory.java:404)
at org.hibernate.cache.entry.CacheEntry.assemble(CacheEntry.java:96)
at org.hibernate.cache.entry.CacheEntry.assemble(CacheEntry.java:82)
at org.hibernate.event.def.DefaultLoadEventListener.assembleCacheEntry(DefaultLoadEventListener.java:540)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromSecondLevelCache(DefaultLoadEventListener.java:494)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:356)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:137)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:193)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:101)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:846)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)
at org.hibernate.type.ManyToOneType.assemble(ManyToOneType.java:196)
at org.hibernate.collection.PersistentSet.initializeFromCache(PersistentSet.java:124)
at org.hibernate.cache.entry.CollectionCacheEntry.assemble(CollectionCacheEntry.java:35)
at org.hibernate.event.def.DefaultInitializeCollectionEventListener.initializeCollectionFromCache(DefaultInitializeCollectionEventListener.java:130)
at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:48)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at org.hibernate.collection.PersistentSet.iterator(PersistentSet.java:163)
at com.uss.domain.ControlPoint.getLatestModified(ControlPoint.java:472)
at com.uss.domain.ControlPointGroup.getLatestModified(ControlPointGroup.java:255)
at com.uss.domain.Screen.toSVG(Screen.java:540)
at com.uss.domain.Screen.toSVG(Screen.java:431)
at com.uss.service.TrafficControlServiceImpl.getTracklineOverviewSvg(TrafficControlServiceImpl.java:253)
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:585)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:292)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:155)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:122)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:174)
at $Proxy10.getTracklineOverviewSvg(Unknown Source)
at com.uss.toa.controller.TracklineSvgController.getSVG(TracklineSvgController.java:300)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.springframework.web.servlet.mvc.multiaction.MultiActionController.invokeNamedMethod(MultiActionController.java:351)
at org.springframework.web.servlet.mvc.multiaction.MultiActionController.handleRequestInternal(MultiActionController.java:305)
at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:128)
at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:44)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:684)
at com.uss.web.SwitchDispatcherServlet.doDispatch(SwitchDispatcherServlet.java:142)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:625)
at org.springframework.web.servlet.FrameworkServlet.serviceWrapper(FrameworkServlet.java:386)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:346)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:225)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:127)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:272)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:165)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3153)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:1973)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1880)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1310)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:207)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:179)



This is almost too obvious, but is the mapping document containing the mapping for the TrackState entity being referenced in your mappingResources list in the session factory bean definition?

_________________
- Matt


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 Profile  
 
 Post subject: Yes I do have !!
PostPosted: Thu Oct 26, 2006 4:32 pm 
Newbie

Joined: Thu May 25, 2006 9:45 am
Posts: 7
Yes I do have the mapping.

But after seeing the Hibernate source file I feel the interceptor's event method should be described in details.

I think I am very close to solve this problem and post the solution soon.

Thanks for the reply

Amit


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 Post subject: When is isTransient called?
PostPosted: Thu Oct 26, 2006 4:34 pm 
Newbie

Joined: Thu May 25, 2006 9:45 am
Posts: 7
I dont know but if someone can give me idea about when isTransient being called?

Thanks,


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 Post subject:
PostPosted: Thu Oct 26, 2006 4:47 pm 
Newbie

Joined: Thu May 25, 2006 9:45 am
Posts: 7
I don't know whether this is the exact problem or not, but after seeing the hibernate code. I had to implement the [b] getEntityName [b] method in the hibernate interceptor I am using.

The reason might be I am using EntityName for my object rather than using the fully qualified name in hibernate mapping?

That would be great if some one can explain me the right reason for this?

Thanks,


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