The common sample for that is when you retrieve from persistent layer a collection of entity referenced with a Class Object and some conditions. The returned collection could contain unchecked objects, so if you just cast it as pointed G_H, you will throw the Cast Exception at this point, and not when the values are accessed.
One example for this is when you retrieve a collection from a DAO that returns an unchecked collection and on your service you iterate over it, this situation can lead to a ClassCastException.
One way to solve it, as you have the wanted class and the unchecked collection is iterate over it and cast it inside the DAO transforming the collection in a checked collection and afterwards return it.
