How to execute logic on Optional if not present?

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With Java 9 or higher, ifPresentOrElse is most likely what you want:

Optional<> opt = dao.find();

opt.ifPresentOrElse(obj -> obj.setAvailable(true),
                    () -> logger.error("…"));

Currying using vavr or alike might get even neater code, but I haven’t tried yet.

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