Potential java.lang.ClassCastException in KeysetAwarePageImpl#nextPageable

[Mobe91]

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The current implementation of KeysetAwarePageImpl#nextPageable is:

    @Override
    public KeysetPageable nextPageable() {
        return (KeysetPageable) super.nextPageable();
    }

This assumes that super.nextPageable() always returns a KeysetPageable, which is not true. If hasNext() is false for the page, super.nextPageable() will return Pageable.unpaged() which is not instanceof KeysetPageable.