@Getter
@Setter
public class Student {
  private String name;
  private String roll;
  private int age;
}

@Getter
@Setter
public class StudentDto {
  private String name;
  private String roll;
  private int age;
}

@Mapper()
public interface Mapper {
  @Mapping(target = "age", ignore = true)
  StudentDto studentToStudentDto(Student source);
  
  @InheritInverseConfiguration
  Student studentDtoToStudent(StudentDto source);
}

@Generated(
    value = "org.mapstruct.ap.MappingProcessor",
    date = "2019-12-08T20:18:06+0600",
    comments = "version: 1.3.1.Final, compiler: javac, environment: Java 11.0.5 (Amazon.com Inc.)"
)
public class MapperImpl implements Mapper {

    @Override
    public StudentDto studentToStudentDto(Student source) {
        if ( source == null ) {
            return null;
        }

        StudentDto studentDto = new StudentDto();

        studentDto.setName( source.getName() );
        studentDto.setRoll( source.getRoll() );

        return studentDto;
    }

    @Override
    public Student studentDtoToStudent(StudentDto source) {
        if ( source == null ) {
            return null;
        }

        Student student = new Student();

        student.setName( source.getName() );
        student.setRoll( source.getRoll() );
        student.setAge( source.getAge() );

        return student;
    }
}