Why I can't delete data in cascade way? - spring-boot

Question

The problem is when I want to delete user I'm getting error in Spring Boot like that:
java.sql.SQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (32506632_pam.badge, CONSTRAINT FK4aamfo6o0h5ejqjn40fv40jdw FOREIGN KEY (user_id) REFERENCES user (id))
I'm guessing that I need to delete data in cascade way. So I've placed CascadeType.REMOVE value to #OneToOne annotation like that, but it doesn't work:
badge entity
#Entity
#Data
#Table(name = "badge")
#AllArgsConstructor
#NoArgsConstructor
public class Badge {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#JsonManagedReference
#ManyToMany(mappedBy = "badges", fetch = FetchType.LAZY)
private List<Reader> readers;
#OneToOne(cascade = CascadeType.REMOVE, orphanRemoval=true)
#JoinColumn(name = "user_id")
private User user;
private String number;
#Lob
#Basic(fetch = FetchType.LAZY)
private byte[] photo;
}
user entity
#Entity
#Data
#Table(name = "user")
#AllArgsConstructor
#NoArgsConstructor
public class User {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String name;
private String lastname;
private String pesel;
private String email;
private String telephone;
private Integer age;
private String gender;
}
reader entity
#Entity
#Data
#Table(name = "reader")
#AllArgsConstructor
#NoArgsConstructor
public class Reader {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#JsonBackReference
#ManyToMany(fetch = FetchType.LAZY)
private List<Badge> badges;
private String department;
private String room;
private Boolean status;
}
Class which loads initial data
#Component
public class DataLoader implements ApplicationRunner {
#Autowired
private UserService userService;
#Autowired
private BadgeService badgeService;
#Autowired
private ReaderService readerService;
#Override
public void run(ApplicationArguments args) throws Exception {
User user1 = new User(null, "Jan", "Kowal", "11111111111", "jan#kowal.pl", "[phone]", new Integer(23), "male");
userService.saveUser(user1);
Reader reader1 = new Reader(null, null, "Warehouse", "207A", new Boolean("true"));
Badge badge1 = new Badge(null, Arrays.asList(reader1), user1, "738604289120", null);
badgeService.saveBadge(badge1);
reader1.setBadges(Arrays.asList(badge1));
readerService.saveReader(reader1);
}
}
Endpoint for deleting user - it uses repository which extends CrudRepository and uses default delete behavior.
#DeleteMapping("/deleteUserById/{id}")
private void deleteUserById(#PathVariable Long id) {
userService.deleteUserById(id);
}
Database structure in phpmyadmin
My goal is to delete user and associated badge with him, then to delete row in reader_badges table.