org.hibernate.NonUniqueObjectException。怎么解决？

Question

在我的模型中有3个实体（实际上超过3个，但实际上是3个实体）

1. 候选人
2. 空缺
3. 事件

他们都有很多人的关系（候选人可以有空缺和许多活动，空缺......候选人和......活动......）。

如果我更新候选人 - 结果不错。 如果我更新空缺 - 好结果 但如果我更新事件我有org.hibernate.NonUniqueObjectException

在事件中改变空缺的收集的时候显示。如果我评论地点，我在哪里更改事件的空缺我没有问题（在我的代码中放置ONE） 转到代码： 模型映射：

空缺：

@Entity
@Table(name = "vacancy")
@XmlRootElement(name="vacancy")
public class Vacancy {

    private Integer id;

    private String name;

    private String description;

    private Date date;

    private User author;

    @XmlTransient
    private Set<Candidate> candidates = new HashSet<Candidate>();
    private Set<VacancyStatus> statusList = new HashSet<VacancyStatus>();
    private Set<Skill> skills = new HashSet<Skill>();
    private Set<Note> comments = new HashSet<Note>();
    private Set<Event> events = new HashSet<Event>();

    public Vacancy() {
        super();
    }

    @ManyToMany(mappedBy = "vacancies", fetch = FetchType.EAGER)
    public Set<Event> getEvents() {
        return events;
    }

    public void setEvents(Set<Event> events) {
        this.events = events;
    }




    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }



    @ManyToMany(mappedBy = "vacancies", fetch = FetchType.EAGER)
    public Set<Candidate> getCandidates() {
        return candidates;
    }

    public void setCandidates(Set<Candidate> candidates) {
        this.candidates = candidates;
    }


    @Override
    public boolean equals(Object obj) {
        if(obj!= null && ((Vacancy)obj).getId() == id ){
            return true;
        }
        return false;
    }
    @Override
    public int hashCode() {
        Integer id = getId();
        return id != null ? id.intValue() : super.hashCode();
    }
    ...
}

候选：

@Entity
@Table(name = "candidate")
@XmlRootElement(name = "candidate")
public class Candidate extends Person {

    @Size(min=3,max=12)
    @Pattern(regexp="[0-9]*",message="phone format must be without + and - (for example: 89123353456)")
    private String phone;

    @Past
    private Date date;

    private User author;

    @Size(min=4, max=100)
    @URL()
    private String resumeUrl;

    private List<CandidateStatus> statusList = new LinkedList<CandidateStatus>();

    private Set<Vacancy> vacancies= new HashSet<Vacancy>();

    private Set<Skill> skills = new HashSet<Skill>();

    private List<Note> comments = new LinkedList<Note>();

    private Set<Event> events = new HashSet<Event>();

    public Candidate() {
        super();
    }

    @ManyToMany(mappedBy = "candidates", fetch = FetchType.EAGER)
    //@LazyCollection(LazyCollectionOption.FALSE)
    public Set<Event> getEvents() {
        return events;
    }

    public void setEvents(Set<Event> events) {
        this.events = events;
    }


    @ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    @JoinTable(name = "candidate_vacancy", joinColumns = @JoinColumn(name = "candidate_id"), inverseJoinColumns = @JoinColumn(name = "vacancy_id"))
    @XmlTransient
    public Set<Vacancy> getVacancies() {
        return vacancies;
    }

    public void setVacancies(Set<Vacancy> vacancies) {
        this.vacancies = vacancies;
    }
...

}
@MappedSuperclass
public abstract class Person {

    @Size(min=3)
    @Pattern(regexp="[a-zA-Z]*")    
    private String name;

    @Size(min=3)
    @Pattern(regexp="[a-zA-Z]*")
    private String surname;

    private Integer id;

    public Person() {
    }

    public Person(String name, String surname) {
        super();
        this.name = name;
        this.surname = surname;
    }

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY )
    @Column (name = "id")
    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    @Column(name = "name")
    //@NotEmpty
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Column(name = "surname")
    //@NotEmpty
    public String getSurname() {
        return surname;
    }

    public void setSurname(String surname) {
        this.surname = surname;
    }
    @Override
    public boolean equals(Object obj) {
        if(obj!=null && ((Person)obj).getId() == id ){
            return true;
        }
        return false;
    }

    @Override
    public int hashCode() {
        Integer id = getId();
        return id != null ? id.intValue() : super.hashCode();
    }




}

事件：

@Entity
@Table(name = "event")
@XmlRootElement
public class Event {
    private Integer id;

    @Size(min=3 )
    @Pattern(regexp="[a-zA-Z]*")    
    private String name;

    @Size(min=5)
    @Pattern(regexp="[a-zA-Z]*")    
    private String description;

    private Date date;

    @Future
    private Date eventDate;

    private User author;

    private Set<Candidate> candidates;
    private Set<Vacancy> vacancies;

    private EventType eventType;
    private EventStatus eventStatus;

    public Event() {
        super();
    }



    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name ="id")
    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }


    @Override
    public boolean equals(Object obj) {
        if(obj!=null && ((Event)obj).getId() == id ){
            return true;
        }
        return false;
    }
    @Override
    public int hashCode() {
        Integer id = getId();
        return id != null ? id.intValue() : super.hashCode();
    }

    @ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    public Set<Candidate> getCandidates() {
        return candidates;
    }

    public void setCandidates(Set<Candidate> candidates) {
        this.candidates = candidates;
    }

    @ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    public Set<Vacancy> getVacancies() {
        return vacancies;
    }

    public void setVacancies(Set<Vacancy> vacancies) {
        this.vacancies = vacancies;
    }
}

在我的@Controller类中，我写了这样的方法：

@RequestMapping(value = "/updateEvent", method = RequestMethod.POST)
    public String updateEvent(Model model,
            @Valid @ModelAttribute("existedEvent") Event event,
            BindingResult result,
            @ModelAttribute("linkedCandidates") Set<Candidate> candidates,
            @ModelAttribute("linkedvacancies") Set<Vacancy> vacancies) {
        if (result.hasErrors()) {
            model.addAttribute("idEvent", event.getId());
            return "eventDetails";
        }
        if (vacancies != null) {
            for (Vacancy vacancy : vacancies) {
                vacancy.getEvents().add(event);
            }
        }
        if (candidates != null) {
            for (Candidate candidate : candidates) {
                candidate.getEvents().add(event);
            }
        }
        event.setVacancies(vacancies);//place ONE (if comment this line - will //work)
        event.setCandidates(candidates);
        eventService.update(event);//error here
        return "redirect:goToEventMenu";

    }

更新

@Transactional
@Service
public class EventService {
     public void update(Event event) {
        eventDao.update(event);
    }
....
}

@Repository("eventDaoImpl")
public class EventDaoImpl extends DaoAbstract implements EventDao {
    @Autowired
    CandidateDao candidateDao;

    @Autowired
    VacancyDao  vacancyDao;



    @Override
    public boolean update(Event event) {
        Session session = sessionFactory.getCurrentSession();
        if (event == null) {
            return false;
        }
        session.update(event);
        return true;
    }
...
}

很抱歉很多代码/但我不知道写在这里）

更新1

堆栈跟踪：

10.09.2013 11:46:14 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [appServlet] in context with path [/ui] threw exception [Request processing failed; nested exception is org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [com.epam.hhsystem.model.vacancy.Vacancy#6]] with root cause
org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [com.epam.hhsystem.model.vacancy.Vacancy#6]
    at org.hibernate.engine.internal.StatefulPersistenceContext.checkUniqueness(StatefulPersistenceContext.java:697)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:296)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:241)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:109)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
    at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:735)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:727)
    at org.hibernate.engine.spi.CascadingAction$5.cascade(CascadingAction.java:258)
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:388)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:331)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:209)
    at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:418)
    at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:358)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:334)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:209)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:166)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:132)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.cascadeOnUpdate(DefaultSaveOrUpdateEventListener.java:364)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:338)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:241)
    at org.hibernate.event.internal.DefaultUpdateEventListener.performSaveOrUpdate(DefaultUpdateEventListener.java:55)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
    at org.hibernate.internal.SessionImpl.fireUpdate(SessionImpl.java:786)
    at org.hibernate.internal.SessionImpl.update(SessionImpl.java:778)
    at org.hibernate.internal.SessionImpl.update(SessionImpl.java:774)
    at com.epam.hhsystem.jpa.EventDaoImpl.update(EventDaoImpl.java:45)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    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:204)
    at $Proxy38.update(Unknown Source)
    at com.epam.hhsystem.services.EventService.update(EventService.java:24)
    at com.epam.hhsystem.services.EventService$$FastClassByCGLIB$$3653e1b6.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:698)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:631)
    at com.epam.hhsystem.services.EventService$$EnhancerByCGLIB$$8266fd26.update(<generated>)
    at com.epam.hhsystem.web.controllers.EventMenuController.updateEvent(EventMenuController.java:164)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:183)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)

更新2

I noticed, that I have no problem if I write change mapping Vacancy in Event:
@ManyToMany(/*cascade = CascadeType.ALL,*/ fetch = FetchType.EAGER)// I comment cascade
    public Set<Vacancy> getVacancies() {
        return vacancies;
    }

为什么呢？对于simmetrical实体候选人这个映射有效：

@ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    public Set<Candidate> getCandidates() {
        return candidates;
    }

如果我在初始代码变体中删除事件和空缺之间的关系 - 它运作良好

如果我在初始代码变体中删除Event和Candidate之间的关系 - 它不起作用

Answer 1

如果您想在同一会话中保存两个具有相同ID的objest，则会发生这种情况。

首先，这不应该发生，试着找出它发生的原因并避免它。如果结果是用例的要求，那么试试

session.merge

干杯!!

Answer 2

在使用之前，尝试将空缺与当前交易合并。

@PersistenceContext
EntityManager entityManager;

...
 public String updateEvent(Model model,
        @Valid @ModelAttribute("existedEvent") Event event,
        BindingResult result,
        @ModelAttribute("linkedCandidates") Set<Candidate> candidates,
        @ModelAttribute("linkedvacancies") Set<Vacancy> vacancies) {

    if (result.hasErrors())...

    ...
    List<Vacancie> mergedVacancies = new ArrayList<>();
        if (vacancies != null) {
        for(Vacancie v : vacancies) {
             mergedVacancies.add(entityManager.merge(v));
        }
    }


    for (Vacancy vacancy : mergedVacancies ) {
         vacancy.getEvents().add(event);
    }
    ...
    //Attention: mergedVacancies is not null like in the original code
    event.setVacancies(mergedVacancies );
    ...
 }