java - 为什么无法使用 JPA 更改实体的引用对象？

Question

我有一个应该编辑的工单对象。在我的票证对象中，有引用对象的属性(见下文)。

...
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "project_id", referencedColumnName="id")
private Project project;

@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "costCenter_id", referencedColumnName="id")
private CostCenter costCenter;
...

但是当我尝试更新实体时，我总是收到错误:

Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Error while committing the transaction

@PutMapping("/tickets/{id}")
@ResponseStatus(HttpStatus.OK)
public Ticket updateTicket(@RequestBody Ticket ticket) throws Exception{
    Optional<Ticket> o = this.ticketRepo.findById(ticket.getId());
    o.ifPresent(element -> {
        if(ticket.getCostCenter() != null) {
            Optional<CostCenter> c = this.costCenterRepo.findById(ticket.getCostCenter().getId());
            c.ifPresent( costCenter -> {
                element.setCostCenter(costCenter);
            });
        }
        if(ticket.getProject() != null) {
            Optional<Project> p = this.projectRepo.findById(ticket.getProject().getId());
            p.ifPresent(project -> {
                element.setProject(project);
            });
        }
        this.ticketRepo.save(element);
    });
    return o.orElseThrow(() -> new NotFoundException(ticket.getId()));
}

PS:当我触发更新而不进行任何更改时，一切正常。

堆栈跟踪:https://textsaver.flap.tv/lists/2vm5

class AuditorAwareImpl implements AuditorAware<Long> {

    @Override
    public Optional<Long> getCurrentAuditor() {
        PersonRepository personRepo = ApplicationContextProvider.getApplicationContext().getBean(PersonRepository.class);
        if(SecurityContextHolder.getContext().getAuthentication() != null) {
            Person p = personRepo.findByUserPrincipalName(SecurityContextHolder.getContext().getAuthentication().getName() + "@email.com");
            return Optional.of(p.getId());
        } else {
            Person p = personRepo.findByUserPrincipalName("SYSTEM");
            return Optional.of(p.getId());
        }
    }
}

@Component(value = "applicationContextProvider")
class ApplicationContextProvider implements ApplicationContextAware {

    private static class AplicationContextHolder {
        private static final InnerContextResource CONTEXT_PROV = new InnerContextResource();
    }

    private static final class InnerContextResource {

        private ApplicationContext context;

        private void setContext(ApplicationContext context) {
            this.context = context;
        }
    }

    public static ApplicationContext getApplicationContext() {
        return AplicationContextHolder.CONTEXT_PROV.context;
    }

    @Override
    public void setApplicationContext(ApplicationContext ac) {
        AplicationContextHolder.CONTEXT_PROV.setContext(ac);
    }

}

@Data
@Getter
@Setter
@MappedSuperclass
@EntityListeners(AuditingEntityListener.class)
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public abstract class BaseEntity implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id", updatable = false, nullable = false)
    protected Long id;

    @CreatedDate
    private Date createdAt;

    @CreatedBy
    private Long createdBy;

    @LastModifiedDate
    private Date updatedAt;

    @LastModifiedBy
    private Long updatedBy;

    @PrePersist
    protected void prePersist() {
        if (this.createdAt == null) createdAt = new Date();
        if (this.updatedAt == null) updatedAt = new Date();
    }

    @PreUpdate
    protected void preUpdate() {
        this.updatedAt = new Date();
    }

    @PreRemove
    protected void preRemove() {
        this.updatedAt = new Date();
    }

}

Answer 1

你有一个StackOverflowError，它强烈表明你在某处有一些无限递归(或者至少是一个非常深的递归):

Caused by: java.lang.RuntimeException: java.lang.StackOverflowError

com.mycompany.test.config.AuditorAwareImpl.getCurrentAuditor 在您很长的堆栈跟踪中重复出现的事实表明它以某种方式参与了您的无限递归，我敢打赌它来自此类，以某种方式触发首先触发它的任何内容，可能是org.springframework.data.auditing.AuditingHandler。因此，请检查您的 AuditorAwareImpl 代码和/或审核配置。