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undjask (13) [Avatar] Offline

In text you are using Optional.EMPTY but for consistency with your syntax for e.g. Optional.ofNullable I would prefer Optional.empty instead.

Listing 9.4 is not complete. That is, the optional's are all null but should be initialized with Optional.empty().

On page 224 first bullet point, you wrote

"unless, you're sure the Optional is empty"

I'm sure you meant "is not empty".