MapStruct 不会为标有特定注释的字段生成映射

Question

I'm dealing with framework code that I cannot modify and which ends up throwing a NullPointerException during mapping because MapStruct thinks it should use a getter defined in a superclass.

Is there a way to tell MapStruct to ignore all getters marked with @JsonIgnore (a jackson library annotation) ?

---

Some more context

To provide a bit of code, here is part of the generated implementation by MapStruct:

        if ( target.getChangedProperties() != null ) {
            target.getChangedProperties().clear();
            List<Property> list = src.getChangedProperties();
            if ( list != null ) {
                target.getChangedProperties().addAll( list );
            }
        }

The NPE is thrown from within target.getChangedProperties() because there are some uninitialized variables being accessed. However, in reality, I don't even want this getter to be part of MapStruct's implementation . (In fact, that getter isn't a getter for a specific variable, but more of a "utility getter", so I do wonder why MapStruct is trying to use it.)

My mapped class would look like:

@Entity
@Table(name = "myentity")
@JsonIgnoreProperties(ignoreUnknown = true)
@Data
@NoArgsConstructor
@AllArgsConstructor
public class MyEntity extends TheFrameworkSuperClass {

  @Id
  private String id;

  private String foo;
}

@MappedSuperclass
@JsonSerialize(include = JsonSerialize.Inclusion.NON_DEFAULT)
@JsonIgnoreProperties(ignoreUnknown = true)
public abstract class TheFrameworkSuperClass {

    @Version
    @JsonProperty(value = "Version")
    private Long version;

    @Transient
    @JsonIgnore
    protected UnitOfWorkChangeSet changes;

    @Override
    @JsonIgnore
    public List<Property> getChangedProperties() {
        // stuff happening before
        this.changes.getObjectChangeSetForClone(this); // throws NPE
        // stuff happening after
    }
}

My MapStruct interface

I have no customization of the mapper's configs. And my interface is:

@Mapper(componentModel = "spring")
public interface MyMapper {

    MyEntity boToBo(MyEntity destination);

    void updateBo(MyEntity src, @MappingTarget MyEntity target);
}

I contemplated using @BeanMapping(ignoreByDefault = true) and then listing each field individually to make sure no extra getters are used, but that is far from being a satisfying solution due to the amount of times I'll have to do that.

Answer 1

Well, turns out even though the changedProperties field does not exist, since MapStruct picks up getChangedProperties() as a getter, you can nonetheless tell MapStruct to ignore that non-existing field...

@Mapper(componentModel = "spring")
public interface MyMapper {

    @Mapping(target = "changedProperties", ignore = true)
    MyEntity boToBo(MyEntity destination);

    @Mapping(target = "changedProperties", ignore = true)
    void updateBo(MyEntity src, @MappingTarget MyEntity target);
}