Spring REST, Hibernate. Сложности десериализации JSON при one-to-many

@Entity
@Table(name="subjects")
public class Subject implements Serializable {
 
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="id")
    private int id;
 
    @ManyToOne(fetch = FetchType.EAGER,
            cascade = {
            CascadeType.DETACH, CascadeType.MERGE,
            CascadeType.PERSIST, CascadeType.REFRESH})
    @JoinColumn(name="section_id")
    @JsonManagedReference
    private SubjectSection section;
 
    @Column(name="name")
    private String name;
 
    public Subject() {
        
    }
 
    // getters and setters
}

@Entity
@Table(name="subject_sections")
public class SubjectSection implements Serializable {
 
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name = "id")
    private int id;
 
    @Column(name = "name")
    private String name;
 
    @OneToMany(fetch = FetchType.LAZY, mappedBy = "section", cascade = CascadeType.ALL)
    @JsonBackReference
    private List<Subject> subjects;
 
    public SubjectSection() {
    }
 
    // getters and setters
 
    public void addSubject(Subject subject){
        if(subjects == null)
            subjects = new ArrayList<>();
 
        subjects.add(subject);
        subject.setSection(this);
    }
 
}

@RestController
@RequestMapping("/subjects")
public class SubjectsApiController {
 
    @Autowired
    private SubjectService subjectService;
 
    // ...
    
    @RequestMapping(value = "/", method = RequestMethod.POST, headers = "Accept=application/json")
    public void addSubject(@RequestBody Subject subject) {
        System.out.println("Controller layer");
        subjectService.saveSubject(subject);
    }
    
    // ...
}