Java 无法从 Child 获取 Parent 数据

我试图查看是否将cab分配给任何员工，这样我就可以获取该员工Id，并简单地将cab设置为null，但映射为@OneToMany，只需返回一个员工列表&amp；通过这种方式，我不会得到任何像cab.getEmp()这样的获取员工详细信息的方法

Employee.java

@Data
@Entity
@Table(name = "employee")
public class Employee {

    @Id
    private Integer id;
    private String username;
    private String password;
    private String role;
    private String dropLocation;

    @ManyToOne(
        cascade = CascadeType.ALL,
        fetch = FetchType.EAGER
    )

    @JoinColumn(
        name = "empCab",
        referencedColumnName = "cabId"
    )
    public Cab cab;
}

Cab.java

@Data
@Entity
@Table(name = "cab")
public class Cab {

    @Id
    private Integer cabId;
    private Integer cabNumber;
    private String cabShift;
    
    @OneToMany(
        cascade = CascadeType.ALL,
        fetch = FetchType.EAGER,
        mappedBy= "cab"
    )
    private List<Employee> emp = new ArrayList<>();

Controller

    @GetMapping("deleteCab")
        public ModelAndView deleteCab(@RequestParam("id") Integer id, ModelAndView mvc){
            Cab cab = cabRepo.findById(id).orElse(null);
            if(cab!=null){
                List<Employee> emp =  cab.getEmp();
                if(!cab.getEmp().isEmpty()){
                    //e1.setCab(null);
                    //empRepo.save(e1);
                    mvc.addObject("msg", "Cab deleted & an employee cab detail also got changed");
                    mvc.setViewName(NOTHING_JSP);
                } else {
                    cabRepo.deleteById(id);
                    mvc.addObject("msg", "Cab removed from the database");
                    mvc.setViewName(NOTHING_JSP);
                }
}