In my project I use Hibernate with programmatic transaction demarcation. Every time in my Service methods i write something similar to this.
Session session = HibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
.. perform operation here
session.getTransaction().commit();
Now I'm going to refactor my code with declarative transaction management. What I got now ...
<context:component-scan base-package="package.*"/>
<bean id="mySessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="configLocation" value="classpath:hibernate.cfg.xml"></property>
<property name="configurationClass">
<value>org.hibernate.cfg.AnnotationConfiguration</value>
</property>
</bean>
<tx:annotation-driven transaction-manager="txManager"/>
<bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory">
<ref local="mySessionFactory"/>
</property>
</bean>
Service class:
@Service
public class TransactionalService {
@Autowired
private SessionFactory factory;
@Transactional
public User performSimpleOperation() {
return (User)factory.getCurrentSession().load(User.class, 1L);
}
}
And simple test -
@Test
public void useDeclarativeDem() {
FileSystemXmlApplicationContext ctx = new FileSystemXmlApplicationContext("spring-config.xml");
TransactionalService b = (TransactionalService)ctx.getBean("transactionalService");
User op = b.performSimpleOperation();
op.getEmail();
When I try to get user email outside of Transactional method, I got lazy initialization exception, email is my case is a simple string. Hibernate does not even perform sql query, until I call any getters on my POJO.
what I am doing wrong here?
Is this approach valid?
Can you suggest any opensources project which works on spring/hibernate with annotation based configuration?
Update
For some reason if I replace getCurrentSession with openSession this code works fine. Can someone explain it please?
Ok, finally i realized what was the problem. In code above i used load instead of get. Session.load did not actually hit the databased. That's the reason why i get lazy-initialization exception outside of @Transactional method
If i use openSession instead of getCurrentSession, session is opened outside of scope spring container. As result session was not close and it allow me to read object properties outside of @Transactional method