如何在JPA中分离关联对象
我已使用em.clear()分离了所有实体,但我没有看到相关对象已分离?如何分离关联对象如何在JPA中分离关联对象,jpa,datanucleus,detach,Jpa,Datanucleus,Detach,我已使用em.clear()分离了所有实体,但我没有看到相关对象已分离?如何分离关联对象 I have a method as : public CustomerSurvey getSurveyByRequest(long requestNo) throws WorkServiceException { logger.debug("Inside getSurveyByRequest : " + requestNo); EntityManager em =
I have a method as :
public CustomerSurvey getSurveyByRequest(long requestNo)
throws WorkServiceException {
logger.debug("Inside getSurveyByRequest : " + requestNo);
EntityManager em = entityManagerFactory.createEntityManager();
Query query = em.createNamedQuery("customerSurvey.findByRequest")
.setParameter("srNo", requestNo);
List<CustomerSurvey> surveys = query.getResultList();
**em.clear();**
em.close();
return surveys.get(0);
}
错误消息:
调查=com.ge.dsp.iwork.entity。CustomerSurvey@36b88ea5
调查id=131
线程“SpringOsgiExtenderThread-134”org.springframework.beans.factory.BeanCreationException中出现异常:创建URL中定义了名为“testCloseRequest”的bean时出错[bundle://178.124:0/META-INF/spring/module-
context.xml]:调用init方法失败;嵌套异常为javax.jdo.jdodetachedFeldAccessException:您刚刚尝试访问字段“customer”,但在您分离
对象不要访问此字段,或者在分离对象时将其分离。
位于org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1455)
位于org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
位于org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
位于org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
位于org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
位于org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
位于org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
位于org.springframework.beans.factory.support.DefaultListableBeanFactory.PreInstanceSingleton(DefaultListableBeanFactory.java:609)
位于org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
位于org.springframework.osgi.context.support.AbstractDelegatedExecutionApplicationContext.access$1600(AbstractDelegatedExecutionApplicationContext.java:69)
位于org.springframework.osgi.context.support.AbstractDelegatedExecutionApplicationContext$4.run(AbstractDelegatedExecutionApplicationContext.java:355)
位于org.springframework.osgi.util.internal.PrivilegedUtils.executeWithCustomTCCL(PrivilegedUtils.java:85)
位于org.springframework.osgi.context.support.AbstractDelegatedExecutionApplicationContext.CompleteFresh(AbstractDelegatedExecutionApplicationContext.java:320)
位于org.springframework.osgi.extender.internal.dependencietraApplicationContextExecutor$CompleteRefreshTask.run(dependencyWaiteraApplicationContextExecutor.java:132)
运行(Thread.java:662)
原因:javax.jdo.jdocatedFeldAccessException:您刚刚尝试访问字段“customer”,但在分离对象时该字段未分离。请不要访问此字段,或者在
分离对象。
在com.ge.dsp.iwork.entity.CustomerSurvey.jdoGetcustomer(CustomerSurvey.java)上
在com.ge.dsp.iwork.entity.CustomerSurvey.getCustomer(CustomerSurvey.java:89)上
在com.ge.dsp.iwork.test.WorkServiceTest.testCloseRequest上(WorkServiceTest.java:181)
在sun.reflect.NativeMethodAccessorImpl.invoke0(本机方法)处
位于sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
在sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)中
位于java.lang.reflect.Method.invoke(Method.java:597)
位于org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.InvokeCustominetMethod(AbstractAutowireCapableBeanFactory.java:1581)
位于org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1522)
位于org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1452)
... 另外14个将分离当前加载的所有字段。您的字段没有被加载,并且您似乎没有访问它,因此它没有被加载,因此它没有被分离。显然,您可以访问它,或者让它变得急切,或者使用DataNucleus fetch groups扩展来加载它。您也可以查看日志以查看分离过程在世界上哪里可以找到关于此的文档?
@Entity
@Table(name = "CUSTOMER_SURVEY", uniqueConstraints = { @UniqueConstraint(columnNames
= "SERVEYID") })
@SequenceGenerator(name="CUSTOMER_SURVEY_SEQUENCE",
sequenceName="CUSTOMER_SURVEY_SEQUENCE", initialValue=1, allocationSize=100)
@NamedQueries({
@NamedQuery(name="customerSurvey.findByRequest",
query="SELECT survey FROM CustomerSurvey survey " +
"WHERE survey.serviceRequest.srNo = :srNo")
})
public class CustomerSurvey implements Serializable {
@Id @GeneratedValue(strategy=GenerationType.SEQUENCE,
generator="CUSTOMER_SURVEY_SEQUENCE")
@Column(name = "SURVEYID", nullable = false)
private String surveyId;
@ManyToOne(fetch=FetchType.LAZY, cascade=CascadeType.DETACH)
@JoinColumn(name="CUSTNO", referencedColumnName="CustNO")
private Customer customer;
@Column(name="AVGRATINGS")
private int avgRatings;
@Column(name="COMMENTS")
private String comments;
@Column(name="SENTON")
private Date sentOn;
@Column(name="RESPONDEDON")
private Date respondedOn;
@OneToMany(fetch=FetchType.LAZY,mappedBy="customerSurvey")
private Set<SurveyResponse> responses;
@OneToOne(fetch=FetchType.LAZY)
@JoinColumn(name="SRNO")
private ServiceRequest serviceRequest;
CustomerSurvey survey = workService.getSurveyByRequest(request.getSrNo());
System.out.println("survey = " + survey);
System.out.println("survey id = " + survey.getSurveyId());
System.out.println("survey customer = " + survey.getCustomer());