MapStruct not generating implementation

Question

I am using Java 17,Gradle as build tool, the following is my gradle dependency

implementation 'org.mapstruct:mapstruct:1.5.5.Final'
implementation 'org.mapstruct:mapstruct-processor:1.5.5.Final'

I am trying to understand MapStruct , but when gradle build,bootRun is called MapStruct is not generating any implementation

Here is the code:

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

    @Mapping(source = "name",target="name")
    @Mapping(source = "totalCount",target="count")
    SimpleDto mapToDto(SimpleRO ro);
}

SimpleDto.java

public class SimpleDto {
    private String name;
    private String count;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCount() {
        return count;
    }

    public void setCount(String count) {
        this.count = count;
    }
}

SimpleRO.java

public class SimpleRO {
    private String name;
    private String totalCount;


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getTotalCount() {
        return totalCount;
    }

    public void setTotalCount(String totalCount) {
        this.totalCount = totalCount;
    }
}

Answer 1

According to the MapStruct Installation Documentation you have to include mapstruct as a dependency but also as annotationProcessor in your build.gradle. Like

dependencies {
    ...
    implementation 'org.mapstruct:mapstruct:1.5.5.Final'

    annotationProcessor 'org.mapstruct:mapstruct-processor:1.5.5.Final'
}

In the file you showed, the second part (mapstruct-processor) was also given as implementation instead of annotationProcessor.