Ed – I really appreciate your help! Thank you a lot! 

Seems to work!

 

Best regards, Christoph

 

 

Von: [email protected] [mailto:[email protected]] Im
Auftrag von Edward Zarecor
Gesendet: Dienstag, 11. Mai 2010 18:39
An: [email protected]
Betreff: Re: warp persist, guice & wicket: use warp persist not in http
request

 

If the data you are loading isn't changing, you could load it on start up
and detach your hibernate objects or cache the data in any number of other
ways so that it is still available after the loading session has closed.
WorkManager would be the appropriate way to load data outside of
Request/Response cycle in a web application.  

http://www.wideplay.com/transactionsemantics, see the section on "Custom
Units of Work."

You could also rely on the various caching mechanisms hibernate provides,
rather than doing this yourself.  

Ed.



On Tue, May 11, 2010 at 11:56 AM, Christoph Grün <[email protected]> wrote:

Thanks! In this class, some data is saved into hibernate objects and then
the session is closed. However, in my case I would like to load some
instances from Hibernate, Jena, etc. as well as images from different
sources and hold them in memory so that I save time as soon as an HTTP
request needs them.

 

I think that WorkManager.beginWork is not appropriate as I cannot access
this data from an HTTP session.

 

Christoph

 

Von: [email protected] [mailto:[email protected]] Im
Auftrag von Edward Zarecor
Gesendet: Dienstag, 11. Mai 2010 17:50


An: [email protected]
Betreff: Re: warp persist, guice & wicket: use warp persist not in http
request

 

Sorry, I had meant to paste this URL into the original email --
multi-tasking!

 

http://jweekend.co.uk/dev/LegUp

Use the form to generate a maven command and run it locally.  The code will
be under src/java as per usual.

 

Ed.

 

On Tue, May 11, 2010 at 11:36 AM, Christoph Grün <[email protected]> wrote:

Ed, thanks a lot for your answer. Where can I find the DataInitializer.java
class?

 

Thanks, Christoph

 

Von: [email protected] [mailto:[email protected]] Im
Auftrag von Edward Zarecor
Gesendet: Dienstag, 11. Mai 2010 16:50


An: [email protected]
Betreff: Re: warp persist, guice & wicket: use warp persist not in http
request

 

Take a look at one of the Guice, Warp and Wicket Archetypes available here,
especially useful as you are using Wicket.

 

Isn't what you are trying to accomplish analogous to what happens in
DataInitializer.java?

 

Ed.

On Tue, May 11, 2010 at 9:40 AM, Christoph Grün <[email protected]> wrote:

Thanks for the link!

 

But I think it cannot be used in a web application because when endWork() is
called, all sessions are closed. I would like to keep all the objects,
loaded from the database, in memory for incoming http requests.

 

Christoph

 

Von: [email protected] [mailto:[email protected]] Im
Auftrag von Edward Zarecor
Gesendet: Dienstag, 11. Mai 2010 15:29
An: [email protected]
Betreff: Re: warp persist, guice & wicket: use warp persist not in http
request

 

See:

 

http://code.google.com/p/warp-persist/wiki/WorkManager

 

Ed.

On Tue, May 11, 2010 at 4:24 AM, Christoph Grün <[email protected]> wrote:

Hi all,

 

I am using Wicket together with Guice and Warp Persist/Servlet.

I have registered the PersistenceService in the contextInitialized method.
However, I would like to do some data loading from the database when wicket
starts, and like to access Hibernate Daos. I am getting the error: 

 

org.hibernate.HibernateException: No session currently bound to execution
context

                at
org.hibernate.context.ManagedSessionContext.currentSession(ManagedSessionCon
text.java:50)

                at
org.hibernate.impl.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.j
ava:591)

                at
com.wideplay.warp.hibernate.SessionProvider.get(SessionProvider.java:42)

                at
com.wideplay.warp.hibernate.SessionProvider.get(SessionProvider.java:32)

          

Using Hibernate from an HTTP request is no problem. How can I configure Warp
to use it directly from WicketApplication?

 

Thanks a lot, Christoph

 

public class Init extends WarpServletContextListener {

 

    @Override

    public void contextInitialized(ServletContextEvent event) {

        super.contextInitialized(event);

        INJ.getInstance(PersistenceService.class).start();

        event.getServletContext().setAttribute("injector", INJ);

    }

 

    @Override

    public void contextDestroyed(ServletContextEvent event) {

        super.contextDestroyed(event);

 

    }

 

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