singleton « Core « JPA Q&A





1. Handling singletons with Hibernate    stackoverflow.com

I have a problem with a factory of singletons and Hibernate. I need to have exactly one instance of objects of class MyObj for each possible value of the parameter ...

2. When should EntityManagerFactory instance be created/opened?    stackoverflow.com

Ok, I read bunch of articles/examples how to write Entity Manager Factory in singleton. One of them easiest for me to understand a bit: http://javanotepad.blogspot.com/2007/05/jpa-entitymanagerfactory-in-web.html I learned that EntityManagerFactory (EMF) should only ...

3. Saving an object into an Entity without persisting it in JPA    stackoverflow.com

I am doing an application in play framework in which I need to store the same instance of a non-Entity object into a JPA Entity without persisting it into the database, ...

4. EnityManagerFactory Singleton. Please just check out?    stackoverflow.com

I am just cruious if this looks solid. It gives no errors but I just want to double check as I am having a pooling issue with c3p0. Just checking to ...

5. Where to create HibernateUtil instance Java Servlet    stackoverflow.com

I've just created my first Java EE servlet using Hibernate. What I don't know is how to initialize the HibernateUtil class so that when the first request comes in, it has already ...

7. Singleton Session Factory - Clarification    forum.hibernate.org

Just to be clear. There is no reason why a session factory HAS to be a singleton. The only reason is to save on the resources needed to create and destroy one. Am I correct in assuming that a Hibernate program would work just as correctly using a non-singleton session factory, just less efficiently?

8. Hibernate Sessions and Singletons...    forum.hibernate.org

I have just started to use Hibernate... wonderfully easy to persist and retrieve data... but I need to run it under a webservice server (glue) and I have always done my DAO thru a singleton connection manager... I looked at the ThreadLocal information, and understand what it is doing, but don't know if that is the right implementation for my scenerio... ...

9. Hibernate and singleton    forum.hibernate.org





10. Singleton Hibernate Service    forum.hibernate.org

11. Singleton with no private constructor    forum.hibernate.org

12. How to ensure a singleton database row?    forum.hibernate.org

Hello DB/Hibernate experts I'm not sure how to do this in Hibernate, or relational databases in general. What I need is one of my persistent classes to have only a single instance in the database - a persistent singleton, in other words. I think I need to use pessimistic locking somehow... I have the following mapping document: Code:

13. Singleton Hibernate for Struts    forum.hibernate.org

Newbie Joined: Sat Jan 08, 2005 6:26 pm Posts: 2 Location: Brazil, Parana, Maringa sorry Im a little new... I mean a class that create a connection with the db, and returns you a Session... I got one class of these, with singleton, but not using the struts' hibernate plugin, here it is: Code: /* * HibernateSessionFactory.java * * Created on ...

14. ImprovedNamingStrategy singleton problem    forum.hibernate.org

15. Persist Singleton Objects Reference    forum.hibernate.org

16. NonUniqueObjectException when persisting singletons    forum.hibernate.org

Newbie Joined: Wed May 23, 2007 11:53 am Posts: 12 I have a client/server application that passes XML data representing an Object of type A to the server. JiBX unmarshals the XML into an A and Hibernate persists it. A has several fields that represent reference data, one of which is called Status. I wanted the application to be able to ...





17. singleton database state class    forum.hibernate.org

Hi all, This might be a weird question, but after mapping all my database tables into persistent classes, I would like to create a singleton class (it has only one possible instance) that reflects the state of the database. For instance, if I have a table for clients, the "state class" would have a method getClients() that returns a list with ...

18. Singleton session for single user desktop app    forum.hibernate.org