HATEOS Usage in StudentServiceImpl.java

StudentServiceImpl.java

  @Override
  @Transactional(propagation = Propagation.REQUIRED)
  public Student getStudentById(String studentId) {

    Optional<StudentEntity> studentEntity = Optional.of(this.studentRepository.findById(studentId)).orElse(null);

    if (studentEntity.isPresent()) {
      Student student = this.studentMapper.toDto(studentEntity.get());

      //adding hateoas links to student object
      final Link selfLink = WebMvcLinkBuilder.linkTo(StudentController.class).slash(student.getId()).withSelfRel();
      student.add(selfLink);

      student.getLectureList().forEach(lectureRef -> {
        final Link selfLectureLink = WebMvcLinkBuilder.linkTo(LectureController.class).slash(lectureRef.getId()).withSelfRel();
        lectureRef.add(selfLectureLink);
      });

      return student;
    }

    return null;
  }