41 words
createEntityManager() - JPA EntityManagerFactory's method
Methodjavax.persistence.EntityManagerFactory
EntityManager createEntityManager()
Create a new application-managed
EntityManager.
This method returns a new EntityManager instance each time
it is invoked.
The isOpen method will return true on the returned instance.- Returns:
- entity manager instance
- Throws:
IllegalStateException- if the entity manager factory has been closed
- Since:
- JPA 1.0
This documentation page is derived (with some adjustments) from the open source JPA 2 RI (EclipseLink)
and is available under the terms of the Eclipse Public License, v. 1.0 and Eclipse Distribution License, v. 1.0.
and is available under the terms of the Eclipse Public License, v. 1.0 and Eclipse Distribution License, v. 1.0.
Object Relational Mapping (ORM) JPA 2 providers include Hibernate, EclipseLink, TopLink, OpenJPA and DataNucleus.
Object DB is not an ORM JPA implementation but an Object Database for Java with built in JPA 2 support.
Which JPA is Faster?
See a comparison of Hibernate, EclipseLink, OpenJPA, DataNucleus, MySQL, PostgreSQL, Derby, HSQLDB, DB4O by Versant, H2 Database, SQLite and ObjectDB
in the JPA Benchmark.
