Java 带EJB后端的SpringMVC前端中的LazyInitializationException异常

我在JBossAS 7.1.1上有一个EJB应用程序，它使用Hibernate 4.3通过jta数据源进行数据库连接。My 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" transaction-type="JTA">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <jta-data-source>java:/postds</jta-data-source>
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.ProgressDialect" />
            <property name="hibernate.connection.charSet" value="UTF-8" />
            <property name="hibernate.hbm2ddl.auto" value="update" />
            <property name="hibernate.show_sql" value="false" />
        </properties>
    </persistence-unit>
</persistence>

我尝试在web.xml中使用OpenSessionInViewFilter：

    <filter>
        <filter-name>openSessionFilter</filter-name>
        <filter-class>org.springframework.orm.hibernate4.support.OpenSessionInViewFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>openSessionFilter</filter-name>
        <url-pattern>/admin/*</url-pattern>
    </filter-mapping>

OpenSessionInViewFilter需要SessionFactorybean。我将其定义添加到applicationContext.xml中：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:jee="http://www.springframework.org/schema/jee"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
                           http://www.springframework.org/schema/jee
                           http://www.springframework.org/schema/jee/spring-jee-3.2.xsd">

    <jee:jndi-lookup id="dataSource" jndi-name="java:/postds"/>

    <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
    </bean>

</beans>

但这并没有解决我的问题。。。你有什么建议吗？

---

非常感谢

如果您使用EJB，容器将为您管理事务和会话。默认情况下，事务提交后，所有EJB方法都是事务容器，用于销毁会话。如果使用延迟加载，则会出现org.hibernate.LazyInitializationException

尝试通过HQL或Criteria API使用fetch join延迟加载字段

有关更多信息，请参阅

    <filter>
        <filter-name>openSessionFilter</filter-name>
        <filter-class>org.springframework.orm.hibernate4.support.OpenSessionInViewFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>openSessionFilter</filter-name>
        <url-pattern>/admin/*</url-pattern>
    </filter-mapping>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:jee="http://www.springframework.org/schema/jee"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
                           http://www.springframework.org/schema/jee
                           http://www.springframework.org/schema/jee/spring-jee-3.2.xsd">

    <jee:jndi-lookup id="dataSource" jndi-name="java:/postds"/>

    <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
    </bean>

</beans>