休眠 如何正确获取日志历史记录?

Question

我使用休眠Envers创建了一个表审计日志，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，我得到了无限的错误循环，我怎样才能正确地做到这一点？ 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);

}

这是我的合作伙伴.java模型： package 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;
}

这是我的合作伙伴货件.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 > {

}

这是我的应用程序.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，我得到了类似循环无限错误的东西，从java.lang.StackOverflowError开始：null，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？

Answer 1

在两个实体上添加@EqualsAndHashCode(of = "id")。我认为使用@ToString指定必填字段也很好。我希望这将解决您的问题。

@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注解实现@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，@EqualsAndHashCode的默认实现将包括所有字段。

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，它使用的是result = result * PRIME + ($partnerShipment == null ? 43 : $partnerShipment.hashCode());，partnerShipment在这里是一个列表。

列表的hashCode来自AbstractList

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，它会遍历每个PartnerShipment项并调用其 hashCode 方法。 并且您还在PartnerShipment上使用@Data注释，因此它的hashCode方法还包括创建无限递归Partner字段。