在本文中，您将会了解到关于Hibernate不会在SpringBootProject中引发LazyInitializationException的新资讯，同时我们还将为您解释hibernate+spr
在本文中，您将会了解到关于Hibernate不会在Spring Boot Project中引发LazyInitializationException的新资讯，同时我们还将为您解释hibernate+springboot的相关在本文中，我们将带你探索Hibernate不会在Spring Boot Project中引发LazyInitializationException的奥秘，分析hibernate+springboot的特点，并给出一些关于c# – NHibernate.LazyInitializationException、hibernate clear() 误用 与 LazyInitializationException： could not initialize proxy - no Session、Hibernate org.hibernate.LazyInitializationException：无法延迟初始化角色集合：、hibernate – 在@Transactional方法中的LazyInitializationException的实用技巧。
本文目录一览：- Hibernate不会在Spring Boot Project中引发LazyInitializationException（hibernate+springboot）
- c# – NHibernate.LazyInitializationException
- hibernate clear() 误用 与 LazyInitializationException： could not initialize proxy - no Session
- Hibernate org.hibernate.LazyInitializationException：无法延迟初始化角色集合：
- hibernate – 在@Transactional方法中的LazyInitializationException
Hibernate不会在Spring Boot Project中引发LazyInitializationException（hibernate+springboot）
我使用Hibernate 5.0进行Spring
Boot项目。不幸的是，LazyInitializationException即使在提交事务之后，Hibernate仍会读取未初始化的延迟对象而不会抛出异常。如何启用LazyInitializationException外部交易？
（当前行为在代码中隐藏了错误。）
答案1
小编典典Spring Boot具有spring.jpa.open-in-view默认值为true
的属性。这将注册一个OpenEntityManagerInViewInterceptor，它将使整个请求的事务保持活动状态。
尝试将其添加到application.properties文件中：
spring.jpa.open-in-view=false在GitHub上进行讨论
有关Spring Boot属性的一些文档
希望能有所帮助！
c# – NHibernate.LazyInitializationException
我们偶尔会出现这个问题,但现在我每次都可以重现它.我在自定义构建的论坛上增加了一个视图计数器,这会导致错误：
NHibernate.LazyInitializationException: Failed to lazily initialize a collection,no session or session was closed
在对象中的另一个集合上发生此错误.如果我添加：
.Not.LazyLoad()
对于我的Fluent映射,错误在我的项目周围移动.我一直禁止对对象的延迟加载,直到它没有延迟加载的地方,然后它抛出了这个错误：
NHibernate.LazyInitializationException: Could not initialize proxy – no Session.
所以,然后我在懒惰的装载上取出了遗嘱,现在我又恢复了原点.当我递增此视图计数器时,它只会出错.这是我的基类保存代码的片段：
using (ISession session = GetSession())
using (ITransaction tx = session.BeginTransaction())
{
session.SaveOrUpdate(entity);
tx.Commit();
}
环顾四周,我在另一篇文章中读到这些交易可能会导致问题,但这是因为它们被放置在哪里.此代码扩展到与我的域对象(存储库类)分开的类.这是帖子：
hibernate: LazyInitializationException: could not initialize proxy
我不相信这是我的问题.这是第一个抛出错误的集合的流畅映射.还有其他几个类似的集合.
HasManyToMany(x => x.Votes)
.WithTableName("PostVotes")
.WithParentKeyColumn("PostId")
.WithChildKeyColumn("VoteId");
解决方法
对此问题的进一步研究表明,在单次回调服务器时,如果执行保存并获取,则需要刷新会话.我在保存后进行了冲洗,这似乎纠正了问题.
hibernate clear() 误用 与 LazyInitializationException： could not initialize proxy - no Session
最近遇到一个很奇怪的问题。 就是 不知道hibernate 怎么就爆
org.hibernate.LazyInitializationException: could not initialize proxy - no Session
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:167)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:215)
at org.hibernate.engine.ForeignKeys$Nullifier.isNullifiable(ForeignKeys.java:137)
at org.hibernate.engine.ForeignKeys$Nullifier.nullifyTransientReferences(ForeignKeys.java:92)
at org.hibernate.engine.ForeignKeys$Nullifier.nullifyTransientReferences(ForeignKeys.java:70)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:311)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:130)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:705)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:693)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:689)
at org.springframework.orm.hibernate3.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:686)
at org.springframework.orm.hibernate3.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:683)
at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:406)
at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
at org.springframework.orm.hibernate3.HibernateTemplate.save(HibernateTemplate.java:683)
at com.moneyP2P.base.spring.service.BaseService.save(BaseService.java:23)
at com.moneyP2P.base.spring.service.BaseService$$FastClassByCGLIB$$aefff274.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$1.proceedWithInvocation(TransactionInterceptor.java:96)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:91)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:631)
at com.rongpd.pay.basedata.service.AllinpayRechargeRecordService$$EnhancerByCGLIB$$f9ebecbe.save(<generated>)
at com.rongpd.pay.basedata.service.AllinpayTranxManagerService.allinPayRechargeAfterDo(AllinpayTranxManagerService.java:660)
at com.rongpd.pay.basedata.service.AllinpayTranxManagerService.allinPayRecharge(AllinpayTranxManagerService.java:602)
at com.rongpd.pay.basedata.service.AllinpayTranxManagerService$$FastClassByCGLIB$$34d49aa4.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$1.proceedWithInvocation(TransactionInterceptor.java:96)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:631)
at com.rongpd.pay.basedata.service.AllinpayTranxManagerService$$EnhancerByCGLIB$$63a19e0b.allinPayRecharge(<generated>)
at com.moneyP2P.p2p.VSFP.mobile.spring.controller.AllinPayMobileController.allinpayPayment(AllinPayMobileController.java:508)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:440)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:428)
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:650)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:230)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1115)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
找不到 hibernate 的 session 的错误？？？ 可是我明明没有 关闭这个 session啊？？
看这个异常是 org.hibernate.LazyInitializationException 懒加载？？ 什么意思啊？ 懒加载 表的其他对象 异常了，差不多了？
那我们可以修改为 急加载？可是 这个方法操作那么多对象，表都改？ 其他地方用不是 都是 急加载了，，，性能啊！！！
那到底是 哪里错问题了呢？
在排除的时候，我是看了好久都没有找到。 有一个 细心的同事 找到了，觉得可能是这个错误：
public void update(Object obj){
dao.clear();// 这里引起的错误
dao.update(obj);
}
注释掉了 这个 clear 就 好了。
分析
开始以为是 hibernate 什么 BUG 什么的呢？ 让人看得不明白。 这个 clear 就是 session.clear() 将缓存清空。 可是想想，将缓存清空就清空了，那么再次查询一次数据库就好了，能有什么问题？
想想看看 上面的 懒加载对象， 和看看代码保存就知道了
.....
rechargesService.update(rechargeToSuccess); //这个里面 update 加了clear
// 记录充值成功后相关流水
rechargesService.rechargeReturn(rechargeToSuccess);
// 记录快捷支付的充值流水数据
AllinpayRechargeRecord arRecord = new AllinpayRechargeRecord();
arRecord.setAccountNo(userBank.getBankAccount());// 卡号
arRecord.setBanktype(userBank.getBanktype());// 银行类型 ， 清空了缓存导致 这个 userBank 使用 延迟加载 查询 的 Banktype 的时候，由于缓存清空了数据，所以就获取不到懒加载的数据。
// 也就是懒加载错误，
arRecord.setOrderNum(reqNo);// 充值流水号
arRecord.setReAccount(tranAmtDecimal);// 实际充值金额以元为单位
arRecord.setUserbasicsinfo(userBank.getUserbasicsinfo());
.....
也就是说 hibernate的 报错有点不明确，很容易把人搞蒙了，想错了。 所以 clear 清缓存 要慎重啊， hibernate的方法不能乱用啊！！！.
Hibernate org.hibernate.LazyInitializationException：无法延迟初始化角色集合：
我有以下提到的实体类，当我执行我的应用程序时，我得到了以下异常。其他一些类似的问题也不能解决问题。
WARNING: StandardWrapperValve[jersey-serlvet]: PWC1406: Servlet.service()
for servlet jersey-serlvet threw exception
org.hibernate.LazyInitializationException: failed to lazily initialize
a collection of role: test.entity.Dept.empDeptno,no session
or session was closed
at org.hibernate.collection.internal.AbstractPersistentCollection.
throwLazyInitializationException(AbstractPersistentCollection.java:393)
at org.hibernate.collection.internal.AbstractPersistentCollection.
throwLazyInitializationExceptionIfNotConnected
(AbstractPersistentCollection.java:385)
at org.hibernate.collection.internal.AbstractPersistentCollection.
initialize(AbstractPersistentCollection.java:378)
我该如何解决这个问题？
Emp实体
@Entity
@Table(name = "EMP",schema = "SCOTT"
)
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "Emp.findAllEmployees",query = "select e from Emp e left
join fetch e.deptNo order by e.empno desc")
})
public class Emp implements java.io.Serializable {
@Id
@Column(name = "EMPNO",unique = true,nullable = false,precision = 4,scale = 0)
private short empno;
@ManyToOne
@JoinColumn(name = "DEPTNO",referencedColumnName = "DEPTNO")
private Dept deptNo;
部门实体
@Entity
@Table(name = "DEPT",schema = "SCOTT"
)
@XmlRootElement
public class Dept implements java.io.Serializable {
@Id
@Column(name = "DEPTNO",precision = 2,scale = 0)
private short deptno;
@OneToMany(fetch=FetchType.LAZY,mappedBy = "deptNo")
private Set<Emp> empDeptno;
DAOImpl
@Override
public List<Emp> findAllEmployees() {
return getEntityManager().createNamedQuery("Emp.findAllEmployees",Emp.class).getResultList();
}
泽西岛RESTful服务
@Component
@Path("/employee")
public class EmployeeRestService {
@Autowired
EmployeeService employeeService;
@GET
@Produces({MediaType.APPLICATION_JSON})
public List<Emp> getEmployees() {
List<Emp> emp = new ArrayList<Emp>();
emp.addAll(getEmployeeService().findAllEmployees());
return emp;
}
springapplicationContext.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd"
>
<!-- Data Source Declaration -->
<bean id="DataSource">
<property name="jndiName" value="jdbc/scottDS"/>
</bean>
<context:component-scan base-package="net.test" />
<bean/>
<bean id="entityManagerFactory">
<property name="dataSource" ref="DataSource" />
<property name="packagesToScan" value="net.test" />
<property name="jpaVendorAdapter">
<bean>
<property name="showSql" value="false" />
<property name="generateDdl" value="false" />
<property name="databasePlatform" value="${jdbc.dialectClass}" />
</bean>
</property>
</bean>
<bean id="defaultLobHandler"/>
<!-- Transaction Config -->
<bean id="transactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
<context:annotation-config/>
<bean id="hibernateStatisticsMBean">
<property name="statisticsEnabled" value="true" />
<property name="sessionFactory" value="#{entityManagerFactory.sessionFactory}" />
</bean>
</beans>
hibernate – 在@Transactional方法中的LazyInitializationException
当我尝试在执行以下操作时尝试访问延迟加载的异常时,我遇到了org.hibernate.LazyInitializationException错误：
@Transactional
public void displayAddresses()
{
Person person = getPersonByID(1234);
Liststem.out.println(address.getFullAddress());
}
我的实体看起来像这样：
@Entity
@Table("PERSON_TBL")
public class Person
{
...
@OnetoMany(cascade=CascadeType.ALL,targetEntity=Address.class,mappedBy="person")
private List
我的印象是,通过使用@Transactional注释在我displayAddresses()方法时,它会保持会话活着直到方法完成,让我访问延迟加载地址的集合.
我错过了什么吗？
编辑
按照Tomasz的建议：在我的displayAddresses()方法中,TransactionSynchronizationManager.isActualTransactionActive()的状态被证明是假的.
这确实缩小了问题范围,但为什么我的交易此时不会有效？
最佳答案
这已经得到了解答,但只是想发布一个替代答案,这个答案在类似情况下对我有用 – 为后代;)
在我的情况下,问题是由于包含延迟加载的集合的实例已被手动驱逐(全部在事务边界内).
关于Hibernate不会在Spring Boot Project中引发LazyInitializationException和hibernate+springboot的问题我们已经讲解完毕，感谢您的阅读，如果还想了解更多关于c# – NHibernate.LazyInitializationException、hibernate clear() 误用 与 LazyInitializationException： could not initialize proxy - no Session、Hibernate org.hibernate.LazyInitializationException：无法延迟初始化角色集合：、hibernate – 在@Transactional方法中的LazyInitializationException等相关内容，可以在本站寻找。
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