How to subclass Hibernate entity class effectively replacing the parent? - hibernate-mapping

Question

Given the following scenario:
A project using a framework
The framework defines basic entity classes (used for logging, user management etc.)
The project has application specific entity classes.
I want to subclass a framework class in a way that does not need changes to the framework code nor the framework specific database schema (apart from any constraints that maybe introduced by additional mappings).
Here is a simplified framework class:
package com.example.parent;
#Entity
#Table("entities")
public class ExampleEntity {
#Id
#GeneratedValue
protected Integer id;
protected String name;
}
And the application specific extension:
package com.example.child;
#Entity
public class ExampleEntity extends com.example.parent.ExampleEntity {
#OneToMany
#JoinColumn
protected Set<OtherEntity> otherEntities;
}
As you can see this just adds an additional mapping to an application specific entity class.
This won't work with Hibernate 4.3.11 out-of-the-box. It will try to create a discriminator column (dtype) which is not desired and IMHO not required here.
I want this to be as transparent as possible (i.e. without changing anything on the framework side) and without any additional manual mapping/casting in the application. Effectively, I want to trick Hibernate into loading only instances of com.example.child.ExampleEntity without the framework even noticing.
TL;DR
How to trick Hibernate into loading entities from the entities table as instances of com.example.child.ExampleEntity?

Answer 1

You can used #Inheritance(strategy = InheritanceType.JOINED) on the parent class. You can find an example here.
So it would work with
package com.example.parent;
#Entity
#Table("entities")
#Inheritance(strategy = InheritanceType.JOINED)
public class ExampleEntity {
#Id
#GeneratedValue
protected Integer id;
protected String name;
}
So you can join any other table to children or parent
This is the official documentation about inheritance mapping.