Nice One!
regards,
Martin
On 8/31/05, Enrique Medina <[EMAIL PROTECTED]> wrote:
> I also run into problems when using lazy loading due to the fact that an
> object related to my object was also lazy.
>
> So I solved it by extending the ListDataModel class with a callback
> mechanism that allows me to define some kind of logic in every row of the
> data table (the logic is reattaching the object to the current Hibernate
> session, of course).
>
> Let me show you some code:
>
> public class LazyListDataModel extends ListDataModel
> {
>
> private DataModelCallback dataModelCallback;
>
> private LazyListDataModel()
> {
> }
>
> private LazyListDataModel(List list)
> {
> }
>
> public LazyListDataModel(List list, DataModelCallback
> dataModelCallback)
> {
> super(list);
>
> this.dataModelCallback = dataModelCallback;
> }
>
> public Object getRowData()
> {
> // Get the object...
> Object objeto = super.getRowData();
>
> // ...invoke the callback before returning it.
> if (this.dataModelCallback != null)
> {
> this.dataModelCallback.execute(objeto);
> }
>
> return objeto;
> }
>
> }
>
> public interface DataModelCallback
> {
>
> public abstract void execute(Object objeto);
>
> }
>
> Example of use:
>
> this.politicasDataModel = new LazyListDataModel(this
> .busquedaPoliticas(), new DataModelCallback()
> {
>
> public void execute(Object objeto)
> {
> WebappUtils.reasociarObjeto(objeto);
> }
> });
>
> and the reattachment code:
>
> public static void reasociarObjeto(Object objeto)
> {
> ((DummyDAOHibernateImpl) FacesUtils.getBean("dummyDAO"))
> .getHibernateTemplate().lock(objeto,
> LockMode.NONE);
> }
>
> Notice that I use a dummyDAO object just to be able to use Hibernate's DAO
> support by Spring ;-)
>
> Also my 2 cents ;-)
>
> 2005/8/31, Martin Marinschek <[EMAIL PROTECTED]>:
> > A very short hint from my side:
> >
> > that exception means this object is not in the session anymore. You
> > can easily reapply it to the session by calling
> >
> > session.update(object)
> >
> > If you are sure that your object has not changed since it was last in
> > the session, you can call:
> >
> > session.lock(object, LockMode.NONE);
> >
> > regards,
> >
> > Martin
> >
> > On 8/31/05, Werner Punz <[EMAIL PROTECTED]> wrote:
> > > I think before giving a short answer... I will give you a detailed
> > > explanation via a links:
> > >
> > >
> http://wiki.apache.org/myfaces/HibernateAndMyFaces?highlight=%28hibernate%29
> > >
> > > This small article describes exactly the problems you run into and how
> > > to solve them...
> > >
> > > Werner
> > >
> > >
> > >
> > > Rick Gruber-Riemer wrote:
> > > > Hej
> > > >
> > > > I use MyFaces (1.0.9), Hibernate (3.0.5) and Spring (1.22) in my
> webapplication. When I get a list of records from the database in a table or
> make a new record using a form everything works fine. However when I try to
> edit a record in a form, I get a
> org.hibernate.LazyInitializationException error on opening
> the editform.
> > > > I understand this has something to do with the Hibernate sessions. And
> it has nothing to do with MyFaces in particular. And I have found some hints
> by googeling like Spring's OpenSessionInViewFilter. However I do not have a
> clue what to change where in the configuration.
> > > >
> > > > => Has somebody used JSF+Spring+Hibernate successfully?
> > > > => Downloadable sample code?
> > > > => Do I need the jsf-spring integration library?
> > > >
> > > > Any hint would be much appreciated ... Rick
> > > >
> > > > <hibernate-mapping>
> > > > <class
> name="dk.trafikstyrelsen.data.transfer.dto.railsecurity.danafile.ScanJourLink
> "
> > > > table="DANAFILE.SCANJOUR_LINK">
> > > > <id name="id" type="long" column="ROW_ID">
> > > > <meta
> attribute="scope-set">protected</meta>
> > > > <generator class="sequence">
> > > > <param name="sequence">DANAFILE.SEQNUMBER</param>
> > > > </generator>
> > > > </id>
> > > > <version column="REVISION" name="revision" />
> > > > <property name="objId" type="string" not-null="true"/>
> > > > <property name="scanJourNumber" type="int"
> column="SCANJOUR_NUMBER" not-null="true"/>
> > > > <property name="notes" type="string" column="NOTES"
> not-null="false"/>
> > > > <property name="active" type="yes_no" column="ACTIVE"
> not-null="true" />
> > > > <property name="createdBy" type="string"
> column="CREATED_BY" not-null="true"/>
> > > > <property name="lastUpdatedBy" type="string"
> column="LAST_UPD_BY" not-null="true"/>
> > > > <property name="createdDate" type="timestamp"
> column="CREATED_DT" not-null="true"/>
> > > > <property name="lastUpdatedDate" type="timestamp"
> column="LAST_UPD_DT" not-null="true"/>
> > > > </class>
> > > > </hibernate-mapping>
> > > >
> > > > <beans>
> > > > <bean id="danafileHbmDS" class="
> oracle.jdbc.pool.OracleDataSource">
> > > > <property
> name="driverType"><value>oracle.jdbc.OracleDriver</value></property>
> > > > <property
> name="URL"><value>jdbc:oracle:thin:@10.0.0.3:1521:dhdvl</value></property>
> > > > <property
> name="user"><value>danafile_web</value></property>
> > > > <property
> name="password"><value>styr3ls3n</value></property>
> > > > </bean>
> > > >
> > > > <!-- Hibernate SessionFactories -->
> > > > <bean id="danafileHbmSF" class="
> org.springframework.orm.hibernate3.LocalSessionFactoryBean">
> > > > <property name="dataSource"><ref
> local="danafileHbmDS"/></property>
> > > > <property name="mappingResources">
> > > > <list>
> > > >
> <value>dk/trafikstyrelsen/data/transfer/dto/railsecurity/danafile/ScanJourLink.hbm.xml</value>
> > > > </list>
> > > > </property>
> > > > <property name="hibernateProperties">
> > > > <props>
> > > > <prop
> key="hibernate.dialect">org.hibernate.dialect.Oracle9Dialect</prop>
> > > > <prop
> key="hibernate.query.substitutions">yes 'Y', no 'N'</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.hibernate3.HibernateTransactionManager">
> > > > <property name="sessionFactory"><ref
> local="danafileHbmSF"/></property>
> > > > </bean>
> > > >
> > > > <bean id="scanJourLinkDAO"
> class="dk.trafikstyrelsen.data.transfer.dao.railsecurity.danafile.ScanJourLinkHbmDAO
> ">
> > > > <property name="sessionFactory"><ref
> local="danafileHbmSF"/></property>
> > > > </bean>
> > > > </beans>
> > > >
> > > >
> > > > ERROR - LazyInitializationException.<init>(19) |
> could not initialize proxy - the owning Session was closed
> > > > org.hibernate.LazyInitializationException: could not
> initialize proxy - the owning Session was closed
> > > > at
> org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java
> :53)
> > > > at
> org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:84)
> > > > at
> org.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java
> :134)
> > > > at
> dk.trafikstyrelsen.data.transfer.dto.railsecurity.danafile.ScanJourLink$$EnhancerByCGLIB$$c24a4569.getScanJourNumber(<generated>)
> > > > 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.apache.myfaces.el.PropertyResolverImpl.getProperty(PropertyResolverImpl.java:419)
> > > > at
> org.apache.myfaces.el.PropertyResolverImpl.getValue
> (PropertyResolverImpl.java:104)
> > > > at
> org.apache.myfaces.el.ELParserHelper$MyPropertySuffix.evaluate(ELParserHelper.java:555)
> > > > at
> org.apache.commons.el.ComplexValue.evaluate(ComplexValue.java
> :145)
> > > > at
> org.apache.myfaces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:441)
> > > >
> > > >
> > >
> > >
> >
> >
> > --
> >
> > http://www.irian.at
> > Your JSF powerhouse -
> > JSF Trainings in English and German
> >
>
>
--
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