我正在使用jakarta，当我运行应用程序时，没有创建“学生”和“教师”表，只创建了“用户”表。会有什么问题呢？

用户类

import jakarta.persistence.*;

import java.io.Serializable;

@Entity
public class User implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(nullable = false, updatable = false)
    private Long id;
    private String first_name;
    private String last_name;

    public User(String first_name, String last_name) {
        this.first_name = first_name;
        this.last_name = last_name;
    }

    public User() {}
}

学生类

import com.fasterxml.jackson.annotation.JsonManagedReference;
import jakarta.persistence.*;

import java.io.Serializable;
import java.util.Set;

@Entity
public class Student extends User implements Serializable {

    @Id
    @GeneratedValue(strategy = jakarta.persistence.GenerationType.IDENTITY)
    @Column(nullable = false, updatable = false)
    private Long id;

    private String first_name;
    private String last_name;

    @JsonManagedReference
    @ManyToMany(mappedBy = "students")
@JoinTable(
        name = "student_module",
        joinColumns = @JoinColumn(name = "student_id"),
        inverseJoinColumns = @JoinColumn(name = "module_id"))
private Set<Module> modules;

    private double moyenneGenerale;

    public Student(String first_name, String last_name) {
        super(first_name, last_name);
    }

    public Student() {
    }
}

模块类：

import jakarta.persistence.*;

import java.io.Serializable;
import java.util.Set;

@Entity
public class Module implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(nullable = false, updatable = false)
    private Long id;

    @OneToMany
    private Set<Subject> subjects;

    @ManyToMany(mappedBy = "modules")
    private Set<Student> students;

    public Module(Set<Subject> subjects) {

    }

    public Module() {}

    public Long getId() {
        return id;
    }

    public Set<Subject> getSubjects() {
        return subjects;
    }

    public void setSubjects(Set<Subject> subjects) {
        this.subjects = subjects;
    }

    public void calculMoyenne() {

    }
}

主题类：

import jakarta.persistence.*;

@Entity
public class Subject {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(nullable = false, updatable = false)
    private Long id;
    private String name;
    private int coefficient;

    @ManyToOne
    @JoinColumn(name = "module_id")
    private Module module;

    public Subject(String name, int coefficient, Module module) {
        this.name = name;
        this.coefficient = coefficient;
        this.module = module;
    }

    public Subject() {}

    public Long getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getCoefficient() {
        return coefficient;
    }

    public void setCoefficient(int coefficient) {
        this.coefficient = coefficient;
    }

}

错误7576 --- [ main] j.LocalContainerEntityManagerFactoryBean：无法初始化JPA EntityManagerFactory：集合“com.example.grademanagement_hamzarami.models.Student.modules”是名为“student”的属性“mappedBy”，该属性在目标实体“com.example.grademanagement_hamzarami.models.Module”中不存在
创建在类路径资源[org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]中定义的名为“entityManagerFactory”的bean时出错：集合“com.example.grademanagement_hamzarami.models.Student.modules”是名为“student”的属性“mappedBy”，该属性在目标实体“com.example.grademanagement_hamzarami.models.Module”中不存在