@Mapper
public interface TestMapper {

    @Mapping(target = ".", ignore = true)
    Target map(Source source);

    class Target {

        private final String value;

        public Target(String value) {
            this.value = value;
        }

        public String getValue() {
            return value;
        }
    }

    class Source {

        private final String value;

        public Target(String value) {
            this.value = value;
        }

        public String getValue() {
            return value;
        }
    }
}