Key/value wrappers not supported by some cache stores

Configuring HotRot caches to use BdbjeCacheStore as a cache store does not work:

• try to put a value (string) for a key (string)

• CacheLoaderInterceptor.loadIfNeeded() is invoked

• BdbjeCacheStore.load(Object key) throws as the key is an ByteArrayKey and not serializable