Hi,

I have the persistence model following :

@Entity
@Table(...)
@Inheritance( strategy = InheritanceType.TABLE_PER_CLASS )
public class A {
...
List<B> getB();
...
}

@Entity
@Table(...)
@Inheritance( strategy = InheritanceType.TABLE_PER_CLASS )
public abstract class B {
...
}

@Entity
@Table(...)
@Inheritance( strategy = InheritanceType.TABLE_PER_CLASS )
public class C extends B {
...
}

@Entity
@Table(...)
@Inheritance( strategy = InheritanceType.TABLE_PER_CLASS )
public class D extends B {
...
}

And hibernate during the backup tries to retrieve a row in the table of class B or it is not in it but in that of the class D and therefore Hibernate throws an exception.

Have you an idea on the problem?

What is the exception that it is throwing?

The exception is :

org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1