MapStruct Mapping Maps

Question

Is it possible to Map an Object called Response with 3 Maps inside it to another Object called ResponseDTO with also 3 Maps

@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class ResponseDTO implements Serializable {

    private Map<String, Map<String, ResponseItemDTO>> map1;
    private Map<String, Map<String, ResponseItemDTO>> map2;
    private Map<String, Map<String, ResponseItemDTO>> map3;

}

public class ResponseItemDTO implements Serializable {

    private String id;
    private String label;
    private String type;

    @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "value")
    @JsonSubTypes({
        @JsonSubTypes.Type(value = SimpleString.class, name = “simpleString"),
        @JsonSubTypes.Type(value = OverrideString.class, name = "overrideString")
    })
    public interface Value {}
}

    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    @Builder
    @JsonTypeName("simpleString")
    public class SimpleString implements ResponseItemDTO {
    
        @JsonProperty("value")
        private String value;
    
    }


@Mapper
interface ResponseMapper {
    ResponseMapper INSTANCE = Mappers.getMapper(ResponseMapper.class);

    @Mapping(target = “map1”, source = "response.map1”)
    @Mapping(target = “map2”, source = "response.map2”)
    @Mapping(target = “map3”, source = "response.map3”)
    ResponseDTO mapResponseDTO(Response response);
    
     //fails and tells me i need to add these mappers
    Map<String, Map<String, ResponseItemDTO>> map1(Map<String, ResponseItem> map1);
    Map<String,ResponseItemDTO> map(ResponseItem value);
}

My current error is:

java: The return type Map<String,ResponseItemDTO> is an abstract class or interface. Provide a non abstract / non interface result type or a factory method.

I tried creating a concrete class to the Mapper but I’m still getting the same error:

default SimpleString createSimpleString() {
       return new SimpleString();
}