Metamodel mm = em.getMetamodel();
account_ = mm.entity(Account.class);
address_ = mm.embeddable(Address.class);
assertNotNull(address_);
contact_ = mm.embeddable(Contact.class);
course_ = mm.entity(Course.class);
creditCard_ = mm.entity(CreditCard.class);
customer_ = mm.entity(Customer.class);
department_ = mm.entity(Department.class);
employee_ = mm.entity(Employee.class);