How to display Grade of Student in the Subject Using Spring Data Jpa #ManyToMany with 3 tables - spring

Question

Hello I want to display the grade of the student in the specific subject, I want to combine the 3 tables student, subject and grade tables into a student_subject_grade and want it to be returned like this:
"studentList": [
{
"id": "2",
"username": "IN",
"password": "admin",
"fullName": "Depp",
"email": "i#live.com",
"subjectList": [
{
"id": 1,
"name": "Programim 1",
"markList": [
{
"mark": 10,
"description": "Excellent"
}
]
},
{
"id": 2,
"name": "Programim 2",
"markList": [
{
"mark": 9,
"description": "Very Good"
}
]
},
{
"id": 3,
"name": "Calculus",
"markList": [
{
"mark": 8,
"description": "Good"
}
]
},
{
"id": 4,
"name": "Discrete mathematics",
"markList": [
{
"mark": 7,
"description": "Well"
}
]
}
]
}
Here is the database schema:
Database Schema
Here are the models:
Student Model:
package springuniversity.Model;
import com.fasterxml.jackson.annotation.JsonProperty;
import javax.persistence.*;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
#Entity
#Table(name="Student")
public class Student {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
//kjo column name duhet ta ket emrin ekzakt si eshte ne databaze emri i kolones perndryshe nuk punon si duhet dhe mund te krijoen kolona te reja ne tabele
#Column(name="user_id")
#JsonProperty
private Integer user_id;
#Column(name="username")
#JsonProperty
private String username;
#Column(name="password")
private String password;
#Column(name="fullname")
#JsonProperty
private String fullName;
#Column(name="email")
#JsonProperty
private String email;
#ManyToMany
#JoinTable(name = "student_subject", joinColumns = #JoinColumn(name = "student_id", referencedColumnName = "user_id"), inverseJoinColumns = #JoinColumn(name = "subject_id", referencedColumnName = "id"))
#JsonProperty
private List<Subject> subjectList;
public Student()
{
}
public Student(int id, String username, String password, String fullName, String email, List<Subject> subjectList) {
super();
this.user_id = id;
this.username = username;
this.password = password;
this.fullName = fullName;
this.email = email;
this.subjectList=subjectList;
}
public String getId() {
return String.valueOf(user_id);
}
public void setId(int user_id) {
this.user_id = user_id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getFullName() {
return fullName;
}
public void setFullName(String fullName) {
this.fullName = fullName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public List<Subject> getSubjectList() {
return subjectList;
}
public void setSubjectList(List<Subject> subjectList) {
this.subjectList = subjectList;
}
}
**
Here is the Subject Model:**
package springuniversity.Model;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import javax.persistence.*;
import java.util.List;
import java.util.Set;
#Entity
#Table(name="Subject")
public class Subject {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name="id")
#JsonProperty
private Integer id;
#Column(name="name")
private String name;
#ManyToMany
#JoinTable(name = "student_subject_marks", joinColumns = #JoinColumn(name = "student_id", referencedColumnName = "user_id"), inverseJoinColumns = #JoinColumn(name = "subject_id", referencedColumnName = "id"))
#JsonProperty
private List<Subject> markList;
public Subject() {
this.id = id;
this.name=name;
}
public void setId(int id)
{
this.id=id;
}
public int getId()
{
return id;
}
public void setName(String name)
{
this.name=name;
}
public String getName()
{
return name;
}
public List<Subject> getMarkList() {
return markList;
}
public void setMarkList(List<Subject> markList) {
this.markList = markList;
}
}
Grade Model:
package springuniversity.Model;
import com.fasterxml.jackson.annotation.JsonProperty;
import javax.persistence.*;
import java.util.List;
#Entity
#Table(name="StudentMark")
public class StudentMark {
#Id
private int grade_id;
#Column(name="mark")
private int mark;
#Column(name="description")
private String description;
public int getGrade_id() {
return grade_id;
}
public void setGrade_id(int grade_id) {
this.grade_id = grade_id;
}
public int getMark() {
return mark;
}
public void setMark(int mark) {
this.mark = mark;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}
What I've tried so far is to create a List markList in the subject Model, the problem is I don't know how to map 3 foreign keys with spring data jpa or HQL, so far I just managed to display the subjects of the student with 2 foreign keys, how should this kind of problem be approached, I've struggled to find articles that explain this kind of topic properly that's why I asked this question.