Map Target object with no source object using MapStruct

Question

I want to map a Target object with no source object using MapStruct. I tried it, but getting the below error.

Can't generate mapping method with no input arguments

Mapper code

public interface MyMapper {
@Mapping(target="student.courseName", constant="Master in Science")
Target map();
}

Answer 1

As you can see this is not supported. And why would you do that? Why not just write your own method?

That aside, you can theoretically try passing a dummy parameter that won't be mapped.

public interface MyMapper {
    @Mapping(target="student.courseName", constant="Master in Science")
    Target map(Integer dummy);
}