Add the getHash() method to the Abstract entity, returning an empty string, so that it can be called safely against all entities.
Add the getHash() method to the Abstract entity, returning an empty string, so that it can be called safely against all entities.

Ruggedy-Limited/ruggedy-vma,Ruggedy-Limited/ruggedy-vma,Ruggedy-Limited/ruggedy-vma,Ruggedy-Limited/ruggedy-vma