Java classes

package com.example.db.models;

import jakarta.persistence.*;

@Entity
@Table(name="users")
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name="user_id")
    private int userId;

    private String username;

    private String password;

    @Column(name="user_type")
    @Enumerated(EnumType.STRING)
    private UserType userType;

    @OneToOne(fetch = FetchType.LAZY, mappedBy = "user")
    private Review review;

    public User() {}

    public int getUserId() {
        return userId;
    }

    public void setUserId(int userId) {
        this.userId = userId;
    }

    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 UserType getUserType() {
        return userType;
    }

    public void setUserType(UserType userType) {
        this.userType = userType;
    }
}
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package com.example.db.models;

import jakarta.persistence.*;

@Entity
@Table(name="reviews")
public class Review {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name="review_id")
    private int reviewId;

    private double rating;

    private String comment;

    @OneToOne(fetch = FetchType.LAZY ,cascade = CascadeType.REMOVE)
    @JoinColumn(name="review_id")
    private User user;

    @ManyToOne(fetch = FetchType.LAZY ,cascade = CascadeType.REMOVE)
    @JoinColumn(name="book_id")
    private Book book;

    public Review() {}

    public int getReviewId() {
        return reviewId;
    }

    public void setReviewId(int reviewId) {
        this.reviewId = reviewId;
    }

    public double getRating() {
        return rating;
    }

    public void setRating(double rating) {
        this.rating = rating;
    }

    public String getComment() {
        return comment;
    }

    public void setComment(String comment) {
        this.comment = comment;
    }

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    public Book getBook() {
        return book;
    }

    public void setBook(Book book) {
        this.book = book;
    }
}
------------------------------------------------------------------------
package com.example.db.models;

public enum UserType {
    administrator("administrator"), user("user"), banned("banned");
    private final String type;
    private UserType(String type) {
        this.type = type;
    }
    public String getType() { return type; }
}
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for(Book b : books) {
                System.out.println(b);
                for(var r : b.getReviews()) {
                    System.out.println(r.getRating() + " " + r.getUser());
                }
            }