关于hibernate：@ElementCollection：错误无法确定类型：java.util.Set，用于列

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

这是我的实体类

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@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

}

这是我的地址课

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@Embeddable
public class Address
{
private String Street;
private String City;
private String State;
private String PinCode;

// Setters and Getters Below
}

号

AM使用一个独立的Java类来尝试插入到我的MySQL数据库中。因为，我是新冬眠的，我现在只想使用这个注释而不是关系。

我的独立Java类，名为HiBiNeTest.java

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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();
}

}

现在，当我运行类hibernatest时，我发现这个异常即将出现。我不知道为什么。

1	Exception in thread"main" org.hibernate.MappingException: Could not determine type for: java.util.Set, for columns:

。