hibernate非空屬性引用空值或瞬態值：

Question

此問題隨機出現。計劃已經運行了一個多月，今天它墜毀了。在添加新訂單時，用戶可以從下拉列表中選擇一家公司。然後他可以將新訂單保存到數據庫中。即使在重新加載應用程序時，它大部分時間都可以工作。錯誤代碼如下：

javax.persistence.PersistenceException：org.hibernate.PropertyValueException：非空屬性引用null或瞬態值：mapped.Order.company（odwzorowania.Zlecenie.firma）

使用Hibernate，JSF 2.1中，MySQL 5.5，javax.persistence。*

這裏是代碼（名稱是來自波蘭的翻譯）

public void update(Order order) throws AdException 
{ 
    try 
    { 
     begin(); 

      Company fir2 = order.getCompany(); 

      em.merge(fir2); 
      em.merge(order); 

     commit(); 
    } 
    catch(HibernateException e) 
    { 
     rollback(); 
     throw new AdException("Nie mozna zaktualizować zlecenia",e); 
    } 
} 

Order實體

import javax.persistence.* //fixed in real code 

    @Entity 
    @Table(name = "order") 


    public class Order implements Serializable { 
    private static final long serialVersionUID = 1L; 

    private Integer idOrder; 
    private Company company; 
    [...] 

    @JoinColumn(name = "company_idCompany", referencedColumnName = "idCompany") 
    @ManyToOne(optional = false, fetch = FetchType.LAZY) 
    public Company getCompany() { 
     return company; 
    } 

    public void setCompany(Company company) { 
     this.company = company; 
    } 
    [...] 

公司實體

import javax.persistence.* 

@Entity 
@Table(name = "company") 

public class Company implements Serializable { 

private static final long serialVersionUID = 1L; 

private Integer idCompany;  
private List<Order> orderList; 
[...] 

@OneToMany(mappedBy = "company", fetch = FetchType.LAZY) 
public List<Order> getOrderList() { 
    return orderList; 
} 

public void setOrderList(List<Order>orderList) { 
    this.orderList = orderList; 
} 
[...] 

堆棧跟蹤（mapped.Order.company是odwzorowania.Zlecenie.firma同樣來自波蘭的翻譯）

2012-xx-xx xx:xx:xx com.sun.faces.application.ApplicationImpl newThing 
SEVERE: Unable to load class: 
javax.persistence.PersistenceException: org.hibernate.PropertyValueException: not-null property references a null or transient value: odwzorowania.Zlecenie.firma 
    at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:637) 
    at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:74) 
    at controllery.FirmaController.get(FirmaController.java:84) 
    at validatory.FirmyValidator.<init>(FirmyValidator.java:32) 
    at sun.reflect.GeneratedConstructorAccessor154.newInstance(Unknown Source) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:532) 
    at java.lang.Class.newInstance0(Class.java:372) 
    at java.lang.Class.newInstance(Class.java:325) 
    at com.sun.faces.application.ApplicationImpl.newThing(ApplicationImpl.java:1699) 
    at com.sun.faces.application.ApplicationImpl.createValidator(ApplicationImpl.java:1557) 
    at com.sun.faces.facelets.tag.jsf.ValidatorTagHandlerDelegateImpl.createValidator(ValidatorTagHandlerDelegateImpl.java:238) 
    at com.sun.faces.facelets.tag.jsf.ValidatorTagHandlerDelegateImpl.applyAttachedObject(ValidatorTagHandlerDelegateImpl.java:132) 
    at com.sun.faces.facelets.tag.jsf.ValidatorTagHandlerDelegateImpl.applyNested(ValidatorTagHandlerDelegateImpl.java:205) 
    at com.sun.faces.facelets.tag.jsf.ValidatorTagHandlerDelegateImpl.apply(ValidatorTagHandlerDelegateImpl.java:87) 
    at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120) 
    at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98) 
    at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:137) 
    at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:188) 
    at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120) 
    at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98) 
    at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:137) 
    at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:188) 
    at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120) 
    at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98) 
    at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:137) 
    at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:188) 
    at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120) 
    at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98) 
    at com.sun.faces.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:93) 
    at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98) 
    at com.sun.faces.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:86) 
    at com.sun.faces.facelets.impl.DefaultFacelet.apply(DefaultFacelet.java:152) 
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.buildView(FaceletViewHandlingStrategy.java:769) 
    at com.sun.faces.application.view.StateManagementStrategyImpl.restoreView(StateManagementStrategyImpl.java:232) 
    at com.sun.faces.application.StateManagerImpl.restoreView(StateManagerImpl.java:188) 
    at com.sun.faces.application.view.ViewHandlingStrategy.restoreView(ViewHandlingStrategy.java:123) 
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.restoreView(FaceletViewHandlingStrategy.java:452) 
    at com.sun.faces.application.view.MultiViewHandler.restoreView(MultiViewHandler.java:148) 
    at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:192) 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) 
    at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:116) 
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:409) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) 
    at java.lang.Thread.run(Thread.java:636) 
Caused by: org.hibernate.PropertyValueException: not-null property references a null or transient value: odwzorowania.Zlecenie.firma 
    at org.hibernate.engine.Nullability.checkNullability(Nullability.java:72) 
    at org.hibernate.event.def.DefaultFlushEntityEventListener.scheduleUpdate(DefaultFlushEntityEventListener.java:270) 
    at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:128) 
    at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:196) 
    at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:76) 
    at org.hibernate.event.def.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:35) 
    at org.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:969) 
    at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1114) 
    at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79) 
    at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:65) 
    ... 58 more 

我已經找到了一些答案，但沒有他們似乎適合我的問題。正如你所看到的，我正在更新公司和訂單之間雙向關聯的雙方。

編輯：固定翻譯

Answer 1

我認爲實體公司與實體之間的訂購這種關係是你的問題的原因。實體訂單沒有公司。

一個問題，order.getCompany（）可以在你的測試爲空？您的實體訂單映射是：

@ManyToOne(**optional = false**, fetch = FetchType.LAZY) 

我看到實體訂單中需要字段公司。

Regards