One-to-many mapping between two entities showing null in table

See more:

Java

MySQL

mapping

Hibernate

, +

Hello, I'm new to thymeleaf. I've two entities, Patient Doctor which have one-to-many relationship between them, when I tried to set one Doctor to Patient, its showing null. I'm sharing my entities and controller here. please give advice.

Doctor entity

<pre>
@Entity
public class Doctor {

	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private long id;
	private String name;
	private String eMail;
	private String password;
	private String degree;
	private String specialization;
	Type type = Type.DOCTOR;
	
	@OneToMany(mappedBy="doctor")
	private Set<Patient> patients = new HashSet<>();

// all constructors getters,setters and toString()


Patient entity

	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private long id;
	private String name;
	private String eMail;
	private String password;
	private String bloodgroup;
	private String record;
	private int age;
	Type type = Type.PATIENT;
	
	@ManyToOne
	@JoinColumn(name = "doctor_id")
	private Doctor doctor;
// all constructors getters,setters and toString()

Controller

/*
 * Get Doctor Details
 * */
@GetMapping("/detailsDoctor")
public String detailsDoctor(@ModelAttribute Doctor doctor,Model model) {
    model.addAttribute("doctor", docRep.getOne(doctor.getId()+1));
    return "Booking-Appointment-Pages/Booking_Page";
}

/*
 * Book Doctor
 * */
@GetMapping("/bookedDoctor")
public String bookedDoctor(@ModelAttribute Doctor doctor, @ModelAttribute Patient patient,  Model model) {
    model.addAttribute("patient", patient);
    if((patient.getDoctor() == null)) {
        patient.setDoctor(docRep.getOne(doctor.getId()+1));
    }
    return "Booking-Appointment-Pages/Confirmed_Booking_Page";
}

What I have tried:

I've checked mapping, it creates table as it has to. but unable to insert the value in it.
I'm so lost right now as it does'nt make any error.