Re: [mapstruct-users] warning: Unmapped target properties

[Gunnar Morling]

Hi,

I assume the problems you see are related to your usage of Lombok for
generating getters/setters. The combination of Lombok + MapStruct is
known to cause issues, as it's not possible for MapStruct to detect
the accessors generated by Lombok in a reliable way.

The problem is that Lombok *alters* the AST, which is generally not
intended in the JSR 269 annotation processing environment and other
processors - that are playing by the rules - don't have a chance to
properly "see" these amendments to the AST.

The best work-around at this point is to have your DTOs/entities
(whatever you apply Lombok to) and the mapper interfaces (to which you
apply MapStruct to) in two separate modules of your build (see
https://github.com/mapstruct/mapstruct-examples/tree/master/mapstruct-lombok
for an example). That way MapStruct can see the generated
getters/setters.

For some more backgrounds of this issue also see
https://github.com/mapstruct/mapstruct/issues/510.

Hth,

--Gunnar




2016-02-02 7:50 GMT+01:00 ZW <zw...@coupang.com>:
> Since My Entity and Dto are follows exact the same namings, so I didn't
> specify the @Mappsings() explicitly, however this works in a very flaky way.
>
>> public interface EntityAMapper {
>> ADto entityAToDto(EntityA e);
>>
>> }
>
>
> When I run gradle test, I got warnings saying "warning: Unmapped target
> properties ...", then I get an empty generation of the EntityAMapper
> Impl.java
>
> When I run with Intellij unit test, the first time it always success, if I
> try to rebuild the project, then all of them are failed, because it
> generates empty implementations,
> but if I change the class definition a little bit, i.e. from interface to
> abstract class, it starts working again, after rebuild it fails again,
> change back to interface it works again.
>
> I really don't want to specify all the mapping property in the Mappings()
> configuration, that's reason why I use this lib, but seems it's quite
> unstable.
>
> I also couldn't use the gradle annotation processor plugin in the given
> example, it conflicts with Lombok annotations.
>
>
>
>
>
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