About EntityManagerFactory

manual

Database Connection using JPA

Describes the main JPA interfaces: EntityManagerFactory, EntityManager and EntityTransaction.... following topics: Overview EntityManagerFactory EntityManager ... for every HTTP request. The main role of an EntityManagerFactory javax.persistence.EntityManagerFactory JPA interface Interface used to interact with ...

 
manual

Obtaining a JPA Database Connection

Shows how to use Java/JPA to connect to the ObjectDB Object Database.... Reference Page... instance. Obtaining an EntityManagerFactory Obtaining an EntityManager ... of two steps. First we need to obtain an instance of EntityManagerFactory javax.persistence.EntityManagerFactory JPA interface Interface used to interact with ...

 
tutorial

Step 3: Add a Context Listener Class

Explains how to add a servlet context listener (to manage an application scope EntityManagerFactory) in an Eclipse Web Application.... database, which will be represented by a JPA's EntityManagerFactory javax.persistence.EntityManagerFactory JPA interface Interface used to interact with ...

 
tutorial

Step 3: Add a Context Listener Class

Explains how to add a servlet context listener (to manage an application scope EntityManagerFactory) in a NetBeans Web Application.... database, which will be represented by a JPA's EntityManagerFactory javax.persistence.EntityManagerFactory JPA interface Interface used to interact with ...

 
manual

Shared (L2) Entity Cache

Explains how to set and use the EntityManagerFactory's shared cache (L2 / level 2) in JPA 2.... cache of entity objects, which is managed by the EntityManagerFactory javax.persistence.EntityManagerFactory JPA interface Interface used to interact with ...

 
manual

Chapter 3 - Using JPA

Explains how to store, retrieve, update and delete entity objects using JPA. This chapter explains how to manage ObjectDB databases using the Java Persistence API (JPA). The first two pages introduce basic JPA interfaces and concepts: Database Connection using JPA Working with JPA Entity Objects ...

 
api-jpa

JPA Reference (JavaDoc)

Java/JPA API Reference (based on the JPA 3 JavaDoc)... javax.persistence.Persistence javax.persistence.EntityManagerFactory javax.persistence.EntityManager ...

 
forum_thread

ArrayIndexOutOfBoundsException at com.objectdb.o.ALS.c(ALS.java:89)

Hi all, I have created a packet grabber using JNetPcap. It creates a scala actor (java thread) for every packet grabbed which connect to an OpenDB database to add or update relevant entry's. Everything works fine until packets arrive with a time difference in the order of microseconds. Every scala actor opens a connection to the database, does what it needs to do, and then closes the connection. Something like: ... Line 16 in ArpMonitor.scala: val emf : EntityManagerFactory = Persistence . createEntityManagerFactory ... that usually it is more efficient to create a single EntityManagerFactory with multiple  EntityManager instances. It is ...

 
forum_thread

Persist error @ManyToMany how to define correct entities relationships

I have Product entities containing a list of Category enties. Each product can have multiple Category but all sue the same limited set of Category entities. There is not changes made to Category from Product. The category ID is taken from the webservice Object ID (unique too). ... ; import javax. persistence . EntityManagerFactory ; import javax. persistence . Id ; ... public static class Test { EntityManagerFactory emf ; EntityManager em ; ...

 
api-jpa

javax.persistence.EntityManagerFactory

Interface used to interact with the entity manager factory for the persistence unit.(Interface of JPA)