出现意外错误类型=内部服务器错误，状态=500

Question

大家好，当我将以下行添加到我的函数时出现错误 500 :

Ticket ti = ticketRepository.findOneById(idtick);

或者这个：

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

它们都不起作用，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";
}

这是门票 class :

@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;
}

ticketRepository 代码：

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

这是堆栈跟踪：

java.lang.WhosebugError: null at java.lang.AbstractStringBuilder.ensureCapacityInternal(Unknown Source) ~[na:1.8.0_251] at java.lang.AbstractStringBuilder.append(Unknown Source) ~[na:1.8.0_251] at java.lang.StringBuilder.append(Unknown Source) ~[na:1.8.0_251] at sun.misc.FloatingDecimal$BinaryToASCIIBuffer.appendTo(Unknown Source) ~[na:1.8.0_251] at sun.misc.FloatingDecimal.appendTo(Unknown Source) ~[na:1.8.0_251] at java.lang.AbstractStringBuilder.append(Unknown Source) ~[na:1.8.0_251] at java.lang.StringBuilder.append(Unknown Source) ~[na:1.8.0_251]

谁能告诉我怎么了？提前致谢。

Answer 1

这是无限循环的症状。如果 Projection 或 Place 类包含 Ticket 元素，那么 Lombok 在尝试为这些 [=] 生成方法时运行进入无限递归循环16=]。检查您的代码是否存在其他类似的循环依赖项。参见：

Answer 2

您能否从实体 class 中删除 @Data、@NoArgConstrucor、@AllArgConstructor 并显式添加内容。您在错误的位置定义了 CrossOrigin。您是否在 classpath 中包含了 spring-data-jpa-repository jar？这个实体 class 是否被扫描，否则你必须明确地使用 @EnableJpaReposiry。由于 JPA 而生成的 SQL 查询是什么。你的数据库启动了吗？运行您的应用程序处于调试模式，这会很有帮助。

出现意外错误类型=内部服务器错误，状态=500

There was an unexpected error type=Internal Server Error, status=500

java

spring-mvc

lombok

spring-data-jpa

spring-boot