使用OpenEntityManagerInViewFilter进行延迟初始化？

本文介绍了使用OpenEntityManagerInViewFilter进行延迟初始化？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我有一点已经工作的JBoss webapp，和一个Lazy初始化问题。 因此我被建议调查在Spring和使用 OpenEntityManagerInViewFilter 。

I have a little already working JBoss webapp, and a Lazy initialisation problem. Therefore I was advised to investigate in Spring and use OpenEntityManagerInViewFilter.

但是我仍然得到错误，希望你能帮助我吗？ 我还需要在我的应用程序中更改哪些内容才能使用Spring OEM过滤器？

Nevertheless I still get the error, hope you could help me? What else do I have to change in my app to make use of the Spring OEM Filter?

我的设置如下：

@Entity class Customer; @Stateless @TransactionAttribute(TransactionAttributeType.REQUIRES_NEW) class DaoService { @PersistenceContext EntityManager em; } @Named @RequestScoped class CustomerFacade;

+ jsf stuff。

+jsf stuff.

[javax.enterprise.resource.webcontainer.jsf.context] (http--127.0.0.1-8080-1) org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: domain.Customer.customerList, no session or session was closed

我这样设置： web.xml

I set it up like this: web.xml

<filter> <filter-name> OpenEntityManagerInViewFilter </filter-name> <filter-class> org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter </filter-class> <init-param> <param-name>singleSession</param-name> <param-value>true</param-value> </init-param> <init-param> <param-name>flushMode</param-name> <param-value>AUTO</param-value> </init-param> </filter> <!-- Include this if you are using Hibernate --> <filter-mapping> <filter-name>OpenEntityManagerInViewFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- Spring config --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <listener> <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class> </listener>

applicationContext.xml：

applicationContext.xml:

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <property name="jpaVendorAdapter"> <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" /> </property> <property name="jpaProperties"> <props> <prop key="hibernate.transaction.manager_lookup_class"> org.hibernate.transaction.JBossTransactionManagerLookup </prop> </props> </property> </bean>

persistence.xml：

persistence.xml:

<?xml version="1.0" encoding="UTF-8"?> <persistence version="2.0" xmlns="java.sun/xml/ns/persistence" xmlns:xsi="www.w3/2001/XMLSchema-instance" xsi:schemaLocation=" java.sun/xml/ns/persistence java.sun/xml/ns/persistence/persistence_2_0.xsd"> <persistence-unit name="primary"> <!-- If you are running in a production environment, add a managed data source, the example data source is just for proofs of concept! --> <jta-data-source>java:jboss/datasources/ExampleDS</jta-data-source> <properties> <!-- Properties for Hibernate --> <property name="hibernate.hbm2ddl.auto" value="create-drop" /> <property name="hibernate.show_sql" value="false" /> </properties> </persistence-unit> </persistence>

基本上所有的设置。

推荐答案

确保您不访问旧实体（例如序列化的实体在上次请求的会话中）。

Make sure you don't access old entities (for example serialized ones in the session in previous request).