Question

I want to filter objects based in some conditions or if their parent is of a specific type.

class A {}

class B extends A {}

class O {
    A a;
    long n;
}

I want all O objects where n > 100 or a is of type B.

In Criteria what would be the or condition

Answer 1

Restrictions.eq("a.class", B.class)

I’ve had bugs though when a single-table inheritance type was chosen (using a discriminator), and where I had to use

Restrictions.eq("a.class", B.DISCRIMINATOR_VALUE)

Note that class is an implicit property. You don’t need to define anything special in the entity to make it work.