In some instances it may be best to wrap a validator and not create a subclass. The payload schema supports the wrapping-validator-instance attribute that allow you to wrap a validator. It contains the following wrappers that can serve as a base class:

Note that you should only wrap UpdatingValidator with wrappers that also implement UpdatingValidator. If you do not, the updatedBeanValue method will never be called on the wrapped UpdatingValidator, and will bypass any custom logic that may be contained within the method.