createEntityManagerFactory(emName, map) - JPA PersistenceProvider's method

EntityManagerFactory createEntityManagerFactory(
  String emName,
  Map map

Called by Persistence class when an EntityManagerFactory is to be created.
emName - the name of the persistence unit
map - a Map of properties for use by the persistence provider. These properties may be used to override the values of the corresponding elements in the persistence.xml file or specify values for properties not specified in the persistence.xml (and may be null if no properties are specified).
EntityManagerFactory for the persistence unit, or null if the provider is not the right provider
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.
Object Relational Mapping (ORM) JPA 2 providers include Hibernate, EclipseLink, TopLink, OpenJPA and DataNucleus.
ObjectDB is not an ORM JPA implementation but an Object Database for Java with built in JPA 2 support.