set java.util.Optional constructor fields default to Optional.empty().

[Zegveld]

If I have an Optional field it would be nice that the instantiation would automatically be empty.
That way I can never have a null-value here.

Example:

@Builder
class MyClass {
  Optional<String> someField;
  // setter/getter/constructor
}

should result in:

class MyClassBuilder {
    Optional<String> someField = Optional.empty();
    // setters and build method.
}

[Nutstree]

Is this only for Optionals? It could be on purpose null for other objects. Actually the writer could have some design freedom to initialize the object personally.

[Zegveld]

If you want to do default initialization you can simply do that in a constructor and not have the builder handle that. The idea for this is that unset java.util.Optional fields which are required for a constructor are default set to Optional.empty().

[Zegveld]

related to #39