public static EntityManager createSharedEntityManager(EntityManagerFactory emf) 
{
		return createSharedEntityManager(emf, null);
}

Create a transactional EntityManager proxy for the given EntityManagerFactory.

 public static EntityManager createSharedEntityManager(EntityManagerFactory emf,
    Map properties) 
{
		Class[] emIfcs = null;
		if (emf instanceof EntityManagerFactoryInfo) {
			EntityManagerFactoryInfo emfInfo = (EntityManagerFactoryInfo) emf;
			Class emIfc = emfInfo.getEntityManagerInterface();
			if (emIfc == null) {
				emIfc = EntityManager.class;
			}
			JpaDialect jpaDialect = emfInfo.getJpaDialect();
			if (jpaDialect != null && jpaDialect.supportsEntityManagerPlusOperations()) {
				emIfcs = new Class[] {emIfc, EntityManagerPlus.class};
			}
			else {
				emIfcs = new Class[] {emIfc};
			}
		}
		else {
			emIfcs = new Class[] {EntityManager.class};
		}
		return createSharedEntityManager(emf, properties, emIfcs);
}

Create a transactional EntityManager proxy for the given EntityManagerFactory.

 public static EntityManager createSharedEntityManager(EntityManagerFactory emf,
    Map properties,
    Class entityManagerInterfaces) 
{
		ClassLoader cl = null;
		if (emf instanceof EntityManagerFactoryInfo) {
			cl = ((EntityManagerFactoryInfo) emf).getBeanClassLoader();
		}
		Class[] ifcs = new Class[entityManagerInterfaces.length + 1];
		System.arraycopy(entityManagerInterfaces, 0, ifcs, 0, entityManagerInterfaces.length);
		ifcs[entityManagerInterfaces.length] = EntityManagerProxy.class;
		return (EntityManager) Proxy.newProxyInstance(
				(cl != null ? cl : SharedEntityManagerCreator.class.getClassLoader()),
				ifcs, new SharedEntityManagerInvocationHandler(emf, properties));
}

Create a transactional EntityManager proxy for the given EntityManagerFactory.