发生意外错误，类型=内部服务器错误，状态= 500

大家好，将以下行添加到函数中时，出现错误500：

Ticket ti = ticketRepository.findOneById(idtick);

或这个 ：

Ticket ti = ticketRepository.findById(idtick).get();

两者都不起作用，这是我的功能：

@GetMapping(path = "/tickets")
public String tickets(Model model, Long idp, 
        @RequestParam(name = "page", defaultValue = "0") int page,
        @RequestParam(name = "size", defaultValue = "8") int size,
        @RequestParam(name = "idtick", defaultValue = "0") Long idtick) {
    
    Ticket t = new Ticket();
    if(idtick!=0) {
        System.out.println("ID Ticket : "+idtick);
        Ticket ti = ticketRepository.findOneById(idtick);
        System.out.println(ti);
    }
    //Projection p = projectionRepository.findOneById(idp);
    model.addAttribute("ticket", t);
    Projection p = projectionRepository.findOneById(idp);
    Page<Ticket> tickets = ticketRepository.findByProjection(p, PageRequest.of(page, size));
    model.addAttribute("idprojection", idp);
    model.addAttribute("tickets", tickets);
    model.addAttribute("page", page);
    model.addAttribute("films", tickets.getContent());
    model.addAttribute("pages", new int[tickets.getTotalPages()]);
    model.addAttribute("currentPage", page);
    model.addAttribute("idtick", idtick);
    model.addAttribute("size", size);
    return "tickets";
}

这是机票类：

@Entity
@Data @NoArgsConstructor @AllArgsConstructor
public class Ticket {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    @Column(length=75)
    private String nomClient;
    private double prix;
    //@Column(unique = true, nullable=true)
    @Column(unique = false,nullable=true)
    private Integer codePayement;
    private boolean reserve;
    @ManyToOne
    private Place place;
    @ManyToOne
    private Projection projection;
}

和ticketRepository的代码：

@RepositoryRestResource
@CrossOrigin("*")
public interface TicketRepository extends JpaRepository<Ticket, Long> {
    public Ticket findOneById(Long id);
}

这是堆栈跟踪：

java.lang.StackOverflowError：在java.lang.AbstractStringBuilder.ensureCapacityInternal（未知来源）处为null（在java.lang.AbstractStringBuilder.append（未知来源）处〜[na：1.8.0_251]在Java处为[na：1.8.0_251]。 lang.StringBuilder.append（未知源）〜[na：1.8.0_251]在sun.misc.FloatingDecimal $ BinaryToASCIIBuffer.appendTo（未知源）〜[na：1.8.0_251]在sun.misc.FloatingDecimal.appendTo（未知源） ）〜[na：1.8.0_251]在java.lang.AbstractStringBuilder.append（未知源）〜[na：1.8.0_251]在java.lang.StringBuilder.append（未知源）〜[na：1.8.0_251]

有人可以告诉我怎么了吗？提前致谢。