问题
i create a table audit log using Hibernate Envers, and i use Spring Data Envers as my library, when i save/update/delete it successfully saved the log in my autid_log table, but when i want to retrive the log data, i got infinite loop of error, how can i do this properly? here is my code :
Here is my controller :
@GetMapping("/getPartnerRelationshipLog/{partnerId}")
public ResponseEntity<?> getPartnerRelationshipLog(@PathVariable Long partnerId) {
// Long id = partner.getId();
Revisions<Integer,Partner> history = partnerService.findRelationLog(partnerId);
return ResponseEntity.ok(history);
}
here is my Partner.java model : 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;
}
and here is my 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;
}
and here is my service :
public Revisions<Integer,Partner> findRelationLog(Long id) {
Revisions<Integer,Partner> partner = partnerRepository.findRevisions(id);
return partner;
}
here is my Repository :
@Repository
public interface PartnerRepository extends RevisionRepository<Partner, Long, Integer>, JpaRepository<Partner, Long > {
}
and here is my Application.java
@SpringBootApplication
@EnableJpaRepositories(repositoryFactoryBeanClass = EnversRevisionRepositoryFactoryBean.class)
@EnableJpaAuditing
public class AuditingApplication {
public static void main(String[] args) {
SpringApplication.run(AuditingApplication.class, args);
}
}
when i get the data with id = 1, i got something like infinite error of loop, start with java.lang.StackOverflowError: null, what i see in my terminal only this :
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]
what did i miss to avoid this error?
回答1:
Add @EqualsAndHashCode(of = "id") on both of your entities. I think it's also good to use @ToString to specify the required fields. I hope this will solve your issue.
@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 annotation implements @EqualsAndHashCode. But in this case, it is creating an infinite circular recursion. Example: for the hashCode method the default implementation of @EqualsAndHashCode will include all the fields.
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 : $partnerShipment.hashCode());
return result;
}
}
look at the partnerShipment. it's using result = result * PRIME + ($partnerShipment == null ? 43 : $partnerShipment.hashCode()); and partnerShipment is a List here.
and the hashCode of the list comes from AbstractList which is
public int hashCode() {
int hashCode = 1;
for (E e : this)
hashCode = 31*hashCode + (e==null ? 0 : e.hashCode());
return hashCode;
}
in this case, it iterates over each PartnerShipment item and calls it's hashCode method. and you are also using @Data annotation on PartnerShipment so it's hashCode method also includes Partner field which creates an infinite recursion.
来源：https://stackoverflow.com/questions/62495740/hibernate-envers-how-to-get-the-log-history-properly