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> instance. JPA requires the definition of a persistence-unit">persistence unit in an XML file in order to be able to generate an EntityManagerFactory. But when using ObjectDB you can either define a standard persistence unit in an XML file or

the application and the persistence provider managing the persistence unit. The methods of this interface ... for this persistence unit or on new entity instances. persistence unit. This method can be used to determine

="description"> Interface used to interact with the entity manager factory for the persistence unit ... to the metamodel of the persistence unit. persistence unit.

to the most relevant entity class. But since the scope of named queries is the entire persistence unit ... >One of the reasons that JPA requires the persistence-unit#managed_persistable_classes">listing of managed classes in a persistence-unit">persistence unit

> EntityManagerFactory for the persistence unit specified by the metadata emName - the name of the persistence unit EntityManagerFactory for the persistence unit, or null

must use a second-level cache for the persistence unit. Corresponds to the value of the Caching is disabled for the persistence unit. Caching is disabled for the persistence unit

">EntityManagerFactory and its associated persistence unit. (Optional) The name of the persistence unit as defined in ... class="description"> (Optional) The name of the persistence unit as defined in

(Optional) The name of the persistence unit as ... ="details"> (Optional) The name of the persistence unit as defined ... > element is specified, the persistence unit for the entity manager that is accessible in JNDI

class="description"> Create and return an EntityManagerFactory for the named persistence unit ... > persistenceUnitName - the name of the persistence unit ... > the factory that creates EntityManagers configured according to the specified persistence unit

and return an EntityManagerFactory for the named persistence unit. - the name of the persistence unit Returns ... to the specified persistence unit Since: JPA 1.0