Usage.. Best Java code snippets using org.mapstruct.Mappings (Showing top 15 results out of 315) org.mapstruct Mappings. Luckily for us, there are multiple object mapping frameworks for Java. Follow the conversation 待转换的类 @Getter @Setter @ToString @Builder @AllArgsConstructor @NoArgsConstructor public class Spu {private Integer id;private String name;private…. We have already drafted this as a feature . You can do that with a default-method in the interface or by changing your mapper type to be a abstract class. I picked this library out of several similar ones since it seems to be mature and performant and supports Immutables out of the box. i'm very new to mapstruct, but your map (List):List method doesnt really make sense - with <U> List<U> in front of it, it means "this could return a list of anything", and whoever calls it is going to define U. so if i did List<Double> output = mapper.map (input);, that would compile even though it wouldn't make any sense. Answer 1. Take these 2 classes to map from/to: class Pair<A,B> { A object1; B object2; // getters and setters } class PairDto<A, B>{ A object1; B object2; // getters and setters } . MapperConfiguration.isValid () seems to be able to fail for various reasons. We have to use the @ Named annotation with the value parameter to inform MapStruct about the custom mapper method: @Mapper public interface UserBodyValuesMapper { @Named ("inchToCentimeter") public static double inchToCentimeter(int inch) { return inch * 2.54 ; } //. } MapStruct uses sensible defaults but steps out of your way when it comes to configuring or implementing special behavior. This is useful in case multiple factory. type conversion - mapping method. Using MapStruct with Maven and Lombok - Bootify.io Kind regards, Michael You define an interface method to accept a source type with a return type. Overview. I could imagine that we can extend the current options and for example extend how and which mapping configs from MappingConfig types are applied automatically or explicitly.