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From Greg Stasica <gstas...@googlemail.com>
Subject struts2+hibernate+spring - lazyInitaializationException
Date Sun, 18 Jul 2010 22:43:23 GMT
hi,

i've been testing very simply scenario using aforementioned technologies but
all i get is LazyInitializationException while trying to access my entity
collection. I've included some code snippets below to make myself very
clear. I don't think there is anything wrong with the attached code as most
of the examples i found on the Internet use exactly (at least i haven't seen
any differences ) this approach. This makes me believe that somehow s2 works
differently here and causes the problem (.. perhaps it's a long shot on my
part but perhaps attaching each action to the ThreadLocal is the problem ?
Surely it's not a problem of having or not having OpenSessionInViewFilter as
the call to hibernate doesn't originate from the view layer (jsp)

*Entity*

@Entity
class Book{

  @OneToMany.....
  private List<Author> authors;
}

*DAOImpl*

class BookDaoImpl {

 public Book find(int Id)
    {

     Book sv = hibernateTemplate.get(Book.class, Id);  //this line works
fine

     sv.getAuthors().size();  //this line throws LazyInitializationException


    return sv;
    }

    @Autowired
    @Qualifier("sessionFactory")
public void setSessionFactory(SessionFactory sessionFactory)
    {
this.hibernateTemplate = new HibernateTemplate(sessionFactory);
    }
}

*spring configuration xml*
*
*
<beans...>
<context:component-scan base-package="com.xx.service,com.xx.dao">
</context:component-scan>
<bean class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"
id="dataSource">
..</bean>

<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="annotatedClasses">
<list>.....
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean>

</beans>

*BeanManager - i'm using this class in struts actions to retrieve spring
beans as i don't want to use spring object factory shipped with struts2*

public class BeanManager {
        public static synchronized BeanManager getInstance() {
if(instance==null)
{
instance = new BeanManager();
}
return instance;
        }

protected BeanManager()
{
URL url =
BeanManager.class.getClassLoader().getResource("applicationContext.xml");
 ctx = new FileSystemXmlApplicationContext(url.getPath());
}

}

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