Provides a Ceylonic EntityManager for use with the Java Persistence API. An EntityManager may be instantiated directly, given an instance of [[javax.persistence.EntityManager|javax.persistence::EntityManager]].

value emf = Persistence.createEntityManagerFactory("example");
value em = EntityManger(emf.createEntityManager());

The EntityManager provides all the same operations as javax.persistence.EntityManager, but:

1. is slightly more typesafe, and
2. accepts Integer, Float, String, Character, and Boolean, arguments to EntityManager.find, EntityManager.getReference and Query.setParameter.

Note: it's perfectly possible to directly use the javax.persistence.EntityManager from Ceylon, but in that case, it's necessary to explicitly convert arguments to [[java.lang.Long|java.lang::Long]], [[java.lang.Double|java.lang::Double]], [[java.lang.String|java.lang::String]], [[java.lang.Character|java.lang::Character]], or [[java.lang.Boolean|java.lang::Boolean]].