@ElementCollection: Error Could not determine type for: java.util.Set, for columns

Here is my Entity class ``` @Entity // Model Class as a DB entity public class UserDetails { @Id private int userId; private String name; @ElementCollection private Set<Address> listOfAddresses = new HashSet(); // Setters and Getters Below } ``` Here is my Address Class ``` @Embeddable public class Address { private String Street; private String City; private String State; private String PinCode; // Setters and Getters Below } ``` Am using a standalone Java Class to try and insert into my MySQL database. Since, am new to Hibernate I just want to use this annotation and not the relations for now. My standalone Java class named HibernateTest.java ``` public class HibernateTest { public static void main(String[] args) { UserDetails user = new UserDetails(); Address addr = new Address(); user.setUserId(1); user.setName("Swateek"); addr.setCity("Berhampur"); addr.setPinCode("760001"); addr.setState("Odisha"); addr.setStreet("RKN"); user.getListOfAddresses().add(addr); Address addrOff = new Address(); addrOff.setCity("Bangalore"); addrOff.setPinCode("560037"); addrOff.setState("MTH"); addrOff.setStreet("YH"); user.getListOfAddresses().add(addrOff); SessionFactory sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory(); Session session = sessionFactory.openSession(); session.beginTransaction(); session.save(user); session.getTransaction().commit(); } } ``` Now when I run the class HibernateTest I find this exception coming up. I have no clue why. ``` Exception in thread "main" org.hibernate.MappingException: Could not determine type for: java.util.Set, for columns: ```