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The name getWhenPresent() doesn't seem descriptive to me.

There is already orElse(value) and orElseThrow(exception), so why not add a plain orElseThrow() to raise the default exception?

The existing methods orElse(defaultValue) and orElseGet(supplier) and orElseThrow(exception) should be enough to cover everything get() does.

But the Java community should move towards ifPresent/map/filter/flatMap etc.