Re: struts2+hibernate+spring - lazyInitaializationException
hi, thanks for all your help... as it turned out the problem was in my configuration :).. basically one of my service wasn't annotated with @Transaction tag and as a consequence my template was closing the session .. On Mon, Jul 19, 2010 at 8:44 PM, Robert Taylor wrote: > Hi Greg, > > I believe Brian is correct. > > You need to wrap BookDao.find(...) within a transaction or use > OpenSessionInView. > Either one of these should keep the session open when you are navigating > the object graph > in your DAO. If you use OSIV (OpenSessionInView) filter, then you can > navigate the > object graph in your web tier as well. > > We are using both OpenSessionInView filter and a service layer which acts > as a facade to the data layer (DAOs). The services are annotated with > @Transactional (although for readOnly transactions this is really > unnecessary within the OSIV scope; but they are there for consistency). > > /robert > - Original Message - From: "Brian Thompson" > > To: "Struts Users Mailing List" ; < > lukasz.len...@gmail.com> > Sent: Monday, July 19, 2010 1:22 PM > Subject: Re: struts2+hibernate+spring - lazyInitaializationException > > > > Looks to me like the session is being closed in the scope of >> hibernateTemplate.get(). >> >> I don't see a transactionManager mentioned in the XML ... you could >> try adding something like this in the XML configuration file: >> >> > class="org.springframework.orm.hibernate.HibernateTransactionManager"> >> >> >> >> >> >> n.b. I haven't tested the above config, so it probably won't work >> as-is. Hopefully it helps, though. >> >> -Brian >> >> - >> To unsubscribe, e-mail: user-unsubscr...@struts.apache.org >> For additional commands, e-mail: user-h...@struts.apache.org >> >> > > - > To unsubscribe, e-mail: user-unsubscr...@struts.apache.org > For additional commands, e-mail: user-h...@struts.apache.org > > -- Greg Stasica
Re: struts2+hibernate+spring - lazyInitaializationException
Hi Greg, I believe Brian is correct. You need to wrap BookDao.find(...) within a transaction or use OpenSessionInView. Either one of these should keep the session open when you are navigating the object graph in your DAO. If you use OSIV (OpenSessionInView) filter, then you can navigate the object graph in your web tier as well. We are using both OpenSessionInView filter and a service layer which acts as a facade to the data layer (DAOs). The services are annotated with @Transactional (although for readOnly transactions this is really unnecessary within the OSIV scope; but they are there for consistency). /robert - Original Message - From: "Brian Thompson" To: "Struts Users Mailing List" ; Sent: Monday, July 19, 2010 1:22 PM Subject: Re: struts2+hibernate+spring - lazyInitaializationException Looks to me like the session is being closed in the scope of hibernateTemplate.get(). I don't see a transactionManager mentioned in the XML ... you could try adding something like this in the XML configuration file: n.b. I haven't tested the above config, so it probably won't work as-is. Hopefully it helps, though. -Brian - To unsubscribe, e-mail: user-unsubscr...@struts.apache.org For additional commands, e-mail: user-h...@struts.apache.org - To unsubscribe, e-mail: user-unsubscr...@struts.apache.org For additional commands, e-mail: user-h...@struts.apache.org
Re: struts2+hibernate+spring - lazyInitaializationException
hi,
thanks for your replies
lukasz
i'm not sure where the problem exactly is but after my additional test i
don't think it's s2 related... i'll try to check hibernate
brian
i've done tests with your changes but to no avail... still the same problem
even when my dao implementation class has a transaction annotation i.e.
@Repository("bookBean")
@Transactional
class BookDaoImpl {.
.
On Mon, Jul 19, 2010 at 6:22 PM, Brian Thompson wrote:
> Looks to me like the session is being closed in the scope of
> hibernateTemplate.get().
>
> I don't see a transactionManager mentioned in the XML ... you could
> try adding something like this in the XML configuration file:
>
>
> class="org.springframework.orm.hibernate.HibernateTransactionManager">
>
>
>
>
>
> n.b. I haven't tested the above config, so it probably won't work
> as-is. Hopefully it helps, though.
>
> -Brian
>
> -
> To unsubscribe, e-mail: user-unsubscr...@struts.apache.org
> For additional commands, e-mail: user-h...@struts.apache.org
>
>
--
Greg Stasica
Re: struts2+hibernate+spring - lazyInitaializationException
Looks to me like the session is being closed in the scope of hibernateTemplate.get(). I don't see a transactionManager mentioned in the XML ... you could try adding something like this in the XML configuration file: n.b. I haven't tested the above config, so it probably won't work as-is. Hopefully it helps, though. -Brian - To unsubscribe, e-mail: user-unsubscr...@struts.apache.org For additional commands, e-mail: user-h...@struts.apache.org
Re: struts2+hibernate+spring - lazyInitaializationException
Hi, I really don't see how Struts2 can messed it up. Would you try to write a unit test to check that? Regards -- Łukasz + 48 606 323 122 http://www.lenart.org.pl/ Kapituła Javarsovia 2010 http://javarsovia.pl - To unsubscribe, e-mail: user-unsubscr...@struts.apache.org For additional commands, e-mail: user-h...@struts.apache.org
struts2+hibernate+spring - lazyInitaializationException
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 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*
*
*
..
.
org.hibernate.dialect.Oracle10gDialect
true
*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());
}
}
