public <T> T get(final Object key, final Class<T> clazz)

This implementation does a 'fake' cast of (T) which discards the 'clazz' parameter altogether. value = (T) someObject is a NOP in Java, and that is why somebody has put a warnings suppression on this method.

It's an easy fix, and I am happy to do it myself, but I don't know your project bylaws etc on user contribution and review processes. Please advise.