I am using hibernate 3.5.1 to implement a basic inheritance setup like this:

@Entity
@Inheritance(InheritanceType.JOINED)
@Table("parent_table")
public class Parent
{
}

@Entity
@Table("child_table")
@PrimaryKeyJoinColumn(name="id")
public class Child extends Parent
{
}


I am using JPA criteria to retrieve entities of the child class. However, when these elements are fetched, an update is issued against parent_type for each entity fetched.

If I model this as the Child has a one to one field that is of type Parent, then I do not have this issue.

Any ideas on what would updates against the parent table at fetch time?

I figured out the issue... both the child and the parent classes had "created" and "updated" fields. Once I renamed the fields in the derived class, the problem went away