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JPA - ExceptionInInitializerError when creating EntityManager

{ EntityManagerFactory emf = javax.persistence.Persistence.createEntityManagerFactory("tmpCLMSPU ... static { javax.persistence.EntityManagerFactory emf = javax.persistence.Persistence

Entity factory - best practices

at the same time? Flying Banana Jiacong Xu Creating multiple EntityManagerFactory instances is thread safe but inefficient. It is more efficient to create one EntityManagerFactory per database

Deadlock, if two threads try to close an entity manager

is closing the EntityManagerFactory that owns that EntityManager. Both threads require locks on both the EntityManager and the EntityManagerFactory but in a different order, so that can cause a deadlock

Cannot sort descending, when ordering by caluculated float in a method

main(String[] args)     {         EntityManagerFactory emf =             Persistence ... ("javaapplication.*"); EntityManagerFactory emf = Persistence

Mysterious "Attempt to persist a reference to a non managed instance" error

.EntityManagerFactory; import javax.persistence.EntityTransaction; import javax.persistence.Persistence; import ... ) {     Enhancer.enhance("failing.*");       EntityManagerFactory emf = Persistence

use of Singleton into tomcat

hi all. i would write a class singleton that encapsulate the entitymanagerFACTORY into it.(the entitymanagerFactory IS A property of the only instance of class singleton. (the class singleton is not a Ejb!!!!!!!!!). into tomcat it not possible use ejbs............. i have to manage the concurrency

Selective merge/cascade of detatched entity

-persisted) company. The following code was run: EntityManagerFactory emf = Persistence ... for improvement would be where I'm inserting a new company each time, such as: EntityManagerFactory emf

Remove not working

;drop"; EntityManagerFactory emf = Persistence.createEntityManagerFactory(url

Issue with orphanRemoval and multiple EntityManagers

){         EntityManagerFactory emf =             Persistence.createEntityManagerFactory(                 "objectdb:test.tmp

problem when primary key value is zero

) {         EntityManagerFactory emf =             Persistence.createEntityManagerFactory

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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