CODEWITHSUNDEEP
hibernatejpa
Michael213
Michael213

Reputation: 317

JPA WrongClassException - inheritance

I've got an Account abstract class which is inherited by two other classes: DoctorAccount, NurseAccount (i omited getters and setters in order to keep post brief). After performing the method checkIfLoginAndPasswordIsCorrect i get an error:

Caused by: org.hibernate.WrongClassException: Object [id=1] was not of the specified subclass [Model.Account] : Discriminator: 1. I found out that query.getSingleResult(); is responsible for this, but I dont know why it throws such errors. Using polymorphism I can assign Account to Doctor/Nurse. Do You have any idea what i'm doing wrong?

@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@Entity
@DiscriminatorColumn(name = "Type_of_account", discriminatorType = 
DiscriminatorType.STRING)
public abstract class Account {
     @Id
     @GeneratedValue(strategy=GenerationType.AUTO)
     @Column(name="Id")
     private int id;
     @Column(name="Login")
     private String login;
     @Column(name="Password")
     private String password;
}

@Entity
public class NurseAccount extends Account{
}

@Entity
public class DoctorAccount extends Account{
}

In logInDAO class:

@Override
public boolean checkIfLoginAndPasswordIsCorrect(String login, String password) {
    Account account = null;
    EntityManagerFactory managerFacotry = Persistence.createEntityManagerFactory("manager");
    EntityManager manager = managerFacotry.createEntityManager();
    manager.getTransaction().begin();
    Query query =  manager.createQuery("SELECT a from Account a WHERE a.login = :login AND a.password = :password")
            .setParameter("login", login).setParameter("password", password);
    manager.getTransaction().commit();
    try {
         account = (Account) query.getSingleResult(); // HERE Occures error
    }
    catch(NoResultException lackOfResult){  
        return false;
    }
    if(account != null)
    {
        return true;
    }
    return false;
}

}

Upvotes: 1

Views: 1038

Answers (1)

Mudassar
Mudassar

Reputation: 3205

You need to add @org.hibernate.annotations.DiscriminatorOptions(force=true) on your Account class

Upvotes: 2

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