How to rollback hibernate operation when Exception occured after the operation? - spring

Question

I have a java application created using spring+hibernate.
I have a code like this:
public class EmployeeDAO extends AbstractHibernateDAO {
public void save(Employee emp) throws HibernateException {
super.save(emp); // inside this method, it calls hibernate session.save(). This super.save method can throws HibernateException
doSometingElse(emp); // inside this method, it doesn't call any hibernate methods. It can throws Exception too.
}
}
I would like to make EmployeeDAO.save method as an atomic method in transactional view.
If super.save(emp) succeed but doSomethingElse(emp) failed (by throwing Exception) then I want the Employee record inserted in super.save(emp) be rollbacked.
How to do this?

Answer 1

All you need to do is annotate the method with #Transactional like this:
public class EmployeeDAO extends AbstractHibernateDAO {
#Transactional
public void save(Employee emp) throws HibernateException {
super.save(emp); // inside this method, it calls hibernate session.save(). This super.save method can throws HibernateException
doSometingElse(emp); // inside this method, it doesn't call any hibernate methods. It can throws Exception too.
}
}
That way if an exception is thrown in the EmployeeDAO save the whole method worth of hibernate operations will be rolled back.
If you prefer for all the methods in this class to run in their own transaction, then annotate the class #Transactional instead.
You'll also need to make sure you do have a transaction manager configured.
If you are using Spring Java configuration you'll want your transaction manager to look something like this:
#Bean
public PlatformTransactionManager transactionManager() {
JpaTransactionManager transactionManager = new JpaTransactionManager(entityManagerFactory());
transactionManager.setDataSource(datasource());
transactionManager.setJpaDialect(new HibernateJpaDialect());
return transactionManager;
}