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我花了很多时间寻找这个错误,但我无法解决这个问题。
我在 Hibernate 和 Postgre 中使用 spring JPA。
我有两个实体 Location 和 Ap:
CREATE TABLE ap
(
id serial NOT NULL,
ssid text NOT NULL,
bssid text NOT NULL,
capabilities text,
CONSTRAINT ap_pkey PRIMARY KEY (id )
)
CREATE TABLE location2
(
latitude double precision NOT NULL,
longitude double precision NOT NULL,
power integer NOT NULL,
ap_id integer,
id serial NOT NULL,
CONSTRAINT location2_pkey PRIMARY KEY (id ),
CONSTRAINT location2_ap_id_fkey FOREIGN KEY (ap_id)
REFERENCES ap (id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION
)
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
@Entity
@Table(name = "ap")
public class Ap implements Serializable {
private Long id;
private String ssid;
private String bssid;
private String capabilities;
private Set<Location> locations = new HashSet<Location>();
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@OneToMany(mappedBy = "ap", cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.LAZY)
public Set<Location> getLocations() {
return locations;
}
public void setLocations(Set<Location> locations) {
this.locations = locations;
}
@Column
public String getSsid() {
return ssid;
}
public void setSsid(String ssid) {
this.ssid = ssid;
}
@Column
public String getBssid() {
return bssid;
}
public void setBssid(String bssid) {
this.bssid = bssid;
}
@Column
public String getCapabilities() {
return capabilities;
}
public void setCapabilities(String capabilities) {
this.capabilities = capabilities;
}
public void addLocation(Location location) {
location.setAp(this);
getLocations().add(location);
}
public void removeLocation(Location location) {
getLocations().remove(location);
}
public Ap() {
super();
}
public Ap(String ssid, String bssid, String capabilities) {
this.ssid = ssid;
this.bssid = bssid;
this.capabilities = capabilities;
}
}
@Entity
@Table(name = "location2")
public class Location implements Serializable {
private Long id;
private double latitude;
private double longitude;
private int power;
private Ap ap;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@ManyToOne
@JoinColumn(name = "ap_id")
public Ap getAp() {
return ap;
}
public void setAp(Ap ap) {
this.ap = ap;
}
@Column
public double getLatitude() {
return latitude;
}
public void setLatitude(double latitude) {
this.latitude = latitude;
}
@Column
public double getLongitude() {
return longitude;
}
public void setLongitude(double longitude) {
this.longitude = longitude;
}
@Column
public int getPower() {
return power;
}
public void setPower(int power) {
this.power = power;
}
public Location(double latitude, double longitude, int power) {
super();
this.latitude = latitude;
this.longitude = longitude;
this.power = power;
}
public Location() {
super();
}
ApService service=context.getBean("ApService", ApService.class);
Ap ap=new Ap("test_ssid2", "test_bssid2", "test_capabilities2");
ap.addLocation(new Location(9.121, 12.9, 12));
ap.addLocation(new Location(9.122, 12.9, 12));
service.save(ap);
public Ap save(Ap ap) {
return apRepository.save(ap);
}
Exception in thread "main" org.springframework.dao.DataIntegrityViolationException: a different object with the same identifier value was already associated with the session: [com.kulig.ap.domain.Location#9]; nested exception is javax.persistence.EntityExistsException: a different object with the same identifier value was already associated with the session: [com.kulig.ap.domain.Location#9]
at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:318)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:106)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:403)
at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:58)
at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:163)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.data.jpa.repository.support.LockModeRepositoryPostProcessor$LockModePopulatingMethodIntercceptor.invoke(LockModeRepositoryPostProcessor.java:91)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:90)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy24.save(Unknown Source)
at com.kulig.ap.service.jpa.ApServiceImpl.save(ApServiceImpl.java:31)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy29.save(Unknown Source)
at com.kulig.ap.Test.main(Test.java:24)
Caused by: javax.persistence.EntityExistsException: a different object with the same identifier value was already associated with the session: [com.kulig.ap.domain.Location#9]
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1359)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1315)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1321)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:843)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:240)
at $Proxy19.persist(Unknown Source)
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.save(SimpleJpaRepository.java:341)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:334)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:319)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155)
... 22 more
最佳答案
在位置尝试改变
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
@Id
@GeneratedValue(generator="LOCATION_SEQ_GEN",strategy=GenerationType.SEQUENCE)
@SequenceGenerator(sequenceName="location_sequence_name",name="LOCATION_SEQ_GEN",allocationSize=1)
allocationSize=1
是不好的做法,但否则会有顺序问题。您可以阅读更多
Hibernate use of PostgreSQL sequence does not affect sequence table
关于jpa - 关系多对一,javax.persistence.EntityExistsException : a different object with the same identifier value was already associated with the session,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12416826/
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