用OpenEntityManagerInViewFilter进行懒惰初始化？
用OpenEntityManagerInViewFilter进行懒惰初始化？
提问于 2012-02-16 08:55:14
我有一个小的已经在工作的JBoss webapp，和一个懒惰的初始化问题。因此，有人建议我在Spring中进行研究，并使用OpenEntityManagerInViewFilter。
尽管如此，我还是得到了错误，希望你能帮助我？为了使用Spring OEM过滤器，我还需要在我的应用程序中进行哪些更改？
我的设置如下：
@Entity
class Customer;
@Stateless
@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
class DaoService {
@PersistenceContext
EntityManager em;
}
@Named
@RequestScoped
class CustomerFacade;+jsf的东西。
[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我这样设置它: 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：
<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：
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0"
xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://java.sun.com/xml/ns/persistence
http://java.sun.com/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>这基本上就是所有的设置。除了延迟加载的问题之外，一切都在正常工作。
回答 2
Stack Overflow用户
回答已采纳
发布于 2013-09-27 07:56:41
确保您没有访问旧的实体(例如，前一个请求中的会话中的序列化实体)。
Stack Overflow用户
发布于 2012-02-18 02:24:49
必须在初始化参数EntityManager中指示
<filter>
<filter-name>
OpenEntityManagerInViewFilter
</filter-name>
<filter-class>
org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter
</filter-class>
<init-param>
<param-name>entityManagerFactoryBeanName</param-name>
<param-value>entityManagerFactory</param-value>
</init-param>
<init-param>
<param-name>flushMode</param-name>
<param-value>AUTO</param-value>
</init-param>
</filter>页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/9304020
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