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我使用 Hibernate Envers 创建了一个表审计日志，并且我使用 Spring Data Envers 作为我的库，当我保存/更新/删除它时，它成功地将日志保存在我的 autid_log 表中，但是当我想检索日志数据时，我得到了无限错误循环，我该如何正确执行此操作？这是我的代码：

这是我的控制器：

@GetMapping("/getPartnerRelationshipLog/{partnerId}")
public ResponseEntity<?> getPartnerRelationshipLog(@PathVariable Long partnerId) {
    // Long id = partner.getId();

    Revisions<Integer,Partner> history = partnerService.findRelationLog(partnerId);
    return ResponseEntity.ok(history);
 
}

这是我的 Partner.java 模型：包 com.example.envers.auditing.Model；

@Data
@Entity
@Audited
@EntityListeners(AuditingEntityListener.class)
@Table(name = "msPartner")
public class Partner {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    public Long id;

    public String partnerCode;

    public String partnerName;

    @CreatedDate
    private Date createDate;
    @LastModifiedDate
    private Date lastModifiedDate;
    @CreatedBy
    private String createdBy;
    @LastModifiedBy
    private String modifiedBy;

    @OneToMany(mappedBy = "partner", cascade = CascadeType.ALL)
    public List<PartnerShipment> partnerShipment;

}

这是我的 PartnerShipment.java ：

@Data
@Entity
@Audited
@EntityListeners(AuditingEntityListener.class)
@Table(name = "msPartnerShipment")
public class PartnerShipment {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    public Long id;

    public String partnerShipmentCode;

    public String partnerShipmentAddress;

    @JsonIgnore
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "partnerId")
    // @NotAudited
    public Partner partner;

    @CreatedDate
    private Date createDate;
    @LastModifiedDate
    private Date lastModifiedDate;
    @CreatedBy
    private String createdBy;
    @LastModifiedBy
    private String modifiedBy;

}

这是我的服务：

public Revisions<Integer,Partner> findRelationLog(Long id) {
    Revisions<Integer,Partner> partner = partnerRepository.findRevisions(id);

    return partner;
}

这是我的存储库：

@Repository
public interface PartnerRepository extends RevisionRepository<Partner, Long, Integer>, JpaRepository<Partner, Long > {
    
}

这是我的 Application.java

@SpringBootApplication
@EnableJpaRepositories(repositoryFactoryBeanClass = EnversRevisionRepositoryFactoryBean.class)
@EnableJpaAuditing
public class AuditingApplication {

    public static void main(String[] args) {
        SpringApplication.run(AuditingApplication.class, args);
    }

}

当我得到 id = 1 的数据时，我得到了类似循环的无限错误，从 java.lang.StackOverflowError: null 开始，我在终端中看到的只有这个：

java.lang.StackOverflowError: null
    at com.example.envers.auditing.Model.PartnerShipment.hashCode(PartnerShipment.java:33) ~[classes/:na]
    at java.util.AbstractList.hashCode(AbstractList.java:541) ~[na:1.8.0_241]
    at org.hibernate.envers.internal.entities.mapper.relation.lazy.proxy.CollectionProxy.hashCode(CollectionProxy.java:131) ~[hibernate-envers-5.4.17.Final.jar:5.4.17.Final]
    at com.example.envers.auditing.Model.Partner.hashCode(Partner.java:31) ~[classes/:na]
    at com.example.envers.auditing.Model.PartnerShipment.hashCode(PartnerShipment.java:33) ~[classes/:na]
    at java.util.AbstractList.hashCode(AbstractList.java:541) ~[na:1.8.0_241]
    at org.hibernate.envers.internal.entities.mapper.relation.lazy.proxy.CollectionProxy.hashCode(CollectionProxy.java:131) ~[hibernate-envers-5.4.17.Final.jar:5.4.17.Final]
    at com.example.envers.auditing.Model.Partner.hashCode(Partner.java:31) ~[classes/:na]
    at com.example.envers.auditing.Model.PartnerShipment.hashCode(PartnerShipment.java:33) ~[classes/:na]
    at java.util.AbstractList.hashCode(AbstractList.java:541) ~[na:1.8.0_241]
    at org.hibernate.envers.internal.entities.mapper.relation.lazy.proxy.CollectionProxy.hashCode(CollectionProxy.java:131) ~[hibernate-envers-5.4.17.Final.jar:5.4.17.Final]
    at com.example.envers.auditing.Model.Partner.hashCode(Partner.java:31) ~[classes/:na]
    at com.example.envers.auditing.Model.PartnerShipment.hashCode(PartnerShipment.java:33) ~[classes/:na]
    at java.util.AbstractList.hashCode(AbstractList.java:541) ~[na:1.8.0_241]
    at org.hibernate.envers.internal.entities.mapper.relation.lazy.proxy.CollectionProxy.hashCode(CollectionProxy.java:131) ~[hibernate-envers-5.4.17.Final.jar:5.4.17.Final]
    at com.example.envers.auditing.Model.Partner.hashCode(Partner.java:31) ~[classes/:na]
    at com.example.envers.auditing.Model.PartnerShipment.hashCode(PartnerShipment.java:33) ~[classes/:na]
    at java.util.AbstractList.hashCode(AbstractList.java:541) ~[na:1.8.0_241]
    at org.hibernate.envers.internal.entities.mapper.relation.lazy.proxy.CollectionProxy.hashCode(CollectionProxy.java:131) ~[hibernate-envers-5.4.17.Final.jar:5.4.17.Final]
    at com.example.envers.auditing.Model.Partner.hashCode(Partner.java:31) ~[classes/:na]
    at com.example.envers.auditing.Model.PartnerShipment.hashCode(PartnerShipment.java:33) ~[classes/:na]
    at java.util.AbstractList.hashCode(AbstractList.java:541) ~[na:1.8.0_241]
    at org.hibernate.envers.internal.entities.mapper.relation.lazy.proxy.CollectionProxy.hashCode(CollectionProxy.java:131) ~[hibernate-envers-5.4.17.Final.jar:5.4.17.Final]

为了避免这个错误，我错过了什么？

4

1 回答 1

1

添加@EqualsAndHashCode(of = "id")两个实体。我认为使用@ToString指定必填字段也很好。我希望这能解决你的问题。

@Data
@Entity
@Audited
@EntityListeners(AuditingEntityListener.class)
@Table(name = "msPartner")
@EqualsAndHashCode(of = "id")
@ToString(of = {"id", "partnerCode", "partnerName"})
public class Partner {}



@Data
@Entity
@Audited
@EntityListeners(AuditingEntityListener.class)
@Table(name = "msPartnerShipment")
@EqualsAndHashCode(of = "id")
@ToString(of = {"id", "partnerShipmentCode", "partnerShipmentAddress"})
public class PartnerShipment {}

@Data注释实现@EqualsAndHashCode。但在这种情况下，它正在创建一个无限循环递归。示例：对于 hashCode 方法，默认实现@EqualsAndHashCode将包括所有字段。

public class Partner {
  public int hashCode() {
    final int PRIME = 59;
    int result = 1;
    final Object $id = this.getId();
    result = result * PRIME + ($id == null ? 43 : $id.hashCode());
    final Object $partnerCode = this.getPartnerCode();
    result = result * PRIME + ($partnerCode == null ? 43 : $partnerCode.hashCode());
    final Object $partnerName = this.getPartnerName();
    result = result * PRIME + ($partnerName == null ? 43 : $partnerName.hashCode());
    final Object $createDate = this.getCreateDate();
    result = result * PRIME + ($createDate == null ? 43 : $createDate.hashCode());
    final Object $lastModifiedDate = this.getLastModifiedDate();
    result = result * PRIME + ($lastModifiedDate == null ? 43 : $lastModifiedDate.hashCode());
    final Object $createdBy = this.getCreatedBy();
    result = result * PRIME + ($createdBy == null ? 43 : $createdBy.hashCode());
    final Object $modifiedBy = this.getModifiedBy();
    result = result * PRIME + ($modifiedBy == null ? 43 : $modifiedBy.hashCode());
    final Object $partnerShipment = this.getPartnerShipment();
    result = result * PRIME + ($partnerShipment == null ? 43 : $partnerShipment.hashCode());
    return result;
}
}

看看partnerShipment。它正在使用 result = result * PRIME + ($partnerShipment == null ? 43 : $partnerShipment.hashCode());并且partnerShipment是这里的列表。

并且hashCode列表的来源AbstractList是

    public int hashCode() {
    int hashCode = 1;
    for (E e : this)
        hashCode = 31*hashCode + (e==null ? 0 : e.hashCode());
    return hashCode;
}

在这种情况下，它遍历每个PartnerShipment项目并调用它的 hashCode 方法。而且您还使用@Data了注释，PartnerShipment因此它的 hashCode 方法还包括Partner创建无限递归的字段。

于 2020-06-21T19:59:04.420 回答