Hi,
I am dusting off some old prototype code that last worked on Hibernate JPA1.0, Glassfish 3.x to Hibernate 4.3.7-Final, Glassfish 4 and JPA2.1. I am seeing an odd problem where an @Entertity class cannot be cast to it's interface (this previously worked for many many months).

Here is a small example:

@Entity
@Table(name = "accounts")
public class UserAccountBean implements Serializable,UserAccount {

/**
*
*/
private static final long serialVersionUID = 6603302682644224769L;

@Id
@SequenceGenerator(name = "usersIdSequence", sequenceName = "users_id_seq", allocationSize = 1)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "usersIdSequence")
@Column(name = "id", nullable = false)
private Integer id;

... various fields and accessors etc.
}

public interface UserAccount extends Serializable {

Employee getEmployee();

Customer getCustomer();

.. more accessors

}


And the calling code (showing problem):

@Override
public UserAccount authenticateUser(final String username, final String password) {
Query query = em.createQuery("select u from UserAccountBean u where u.username = :username");
query.setParameter("username", username);
List<UserAccount>userList = query.getResultList();

boolean test = userList != null;

test = userList.size() == 1; // this works and shows 1 entry was retrieved - using a debugger I can see it is correct

test = userList.get(0).getPassword().equals(password); // this goes BANG! on the get(0) where it performs a cast returning from the container

}


Warning: A system exception occurred during an invocation on EJB UserAccountServiceBean, method: public <package>.UserAccount <package>.UserAccountServiceBean.authenticateUser(java.lang.String,java.lang.String)
Warning: javax.ejb.EJBException

Caused by: java.lang.ClassCastException: <package>.UserAccountBean cannot be cast to <package>.UserAccount

Any ideas? has something changed in this area? looks pretty simple and standard to me...

</scratching head>

Update: Something definitely appears to be odd - using the debugger I can evaluate userList.get(0).getPassword() and it shows me the retrieved password....

Update 2: Tried Hibernate 4.3.5-Final and it all works (same config).

So, 4.3.7-Final seems to be the issue, at least for my setup. I initially followed these instructions https://coderwall.com/p/e5fxrw/use-hibernate-4-3-x-with-jta-on-glassfish-4 to get me going.