Spring OpenSessionInViewInterceptor不起作用 [英] Spring OpenSessionInViewInterceptor doesn't work

问题描述

$ $在hibernate和延迟加载时出现了着名的问题。 b $ b
• 使方法成为事务性的（这并不总是可以理解的）


• 使用OpenSessionInViewInterceptor。

后者更可取IMO。无论如何，我不知道这个拦截器是否触发（事实上，我得到了相同的延迟加载异常，没有任何变化）：

  org.hibernate.LazyInitializationException：无法延迟初始化角色集合：it.jsoftware.jacciseweb.beans.Listino.prodotti，没有会话或会话已关闭
  

我使用简单的基于注解的url映射，所以阅读Spring 3的文档，我在servlet-context.xml中使用它：

 < bean id =handlerMapping
 class =org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping> 
<！ - < property name =ordervalue =2/> - > 
< property name =interceptors> 
< list> 
< ref bean =openSessionInViewInterceptorInst/> 
< / list> 
< / property> 
< / bean> 
  

哪个应该可以做到。但它不起作用，我得到了例外。我如何确保拦截器正在发射？如何解决这个问题？

解决方案

您是否使用@RequestMapping注解？如果我没有记错，那么把拦截器放在url bean上会有问题。使用Spring 3.0，您可以像这样定义拦截器：

 < mvc：interceptors> 
< bean class =org.springframework.orm.hibernate3.support.OpenSessionInViewInterceptor> 
< property name =sessionFactory> 
< ref local =sessionFactory/> 
< / property> 
< / bean> 
< / mvc：interceptors> 
  

假设sessionFactory是对SessionFactory bean的引用。

您还需要包含mvc命名空间。

  xmlns：mvc =http：// www。 springframework.org/schema/mvc
 xsi：schemaLocation =http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0。 xsd
  

I had the (in)famous problem with hibernate and lazy loading when views are rendered.... As many say, the only two solutions are:

• Make the method transactional (and this is not always desiderable)
• Use OpenSessionInViewInterceptor.

The latter is preferable IMO. Anyway I'm not sure if this interceptor is firing at all (in fact I get the same Lazy loading exception and nothing changes):

org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: it.jsoftware.jacciseweb.beans.Listino.prodotti, no session or session was closed

I'm using simple annotation based url mappings, so reading the docs for Spring 3, I'm using this in my servlet-context.xml:

<bean id="handlerMapping"
        class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping">
        <!-- <property name="order" value="2" /> -->
        <property name="interceptors">
            <list>
                <ref bean="openSessionInViewInterceptorInst" />
            </list>
        </property>
    </bean>

Which should make the trick. But it is not working and I get the exception. How do I make sure my interceptor is firing? How do I solve this?

解决方案

Are you using the @RequestMapping annotation? If I remember right there was an issue with putting the interceptor on the url bean. With Spring 3.0 you can define the interceptor like this:

<mvc:interceptors>
    <bean class="org.springframework.orm.hibernate3.support.OpenSessionInViewInterceptor">
        <property name="sessionFactory">
            <ref local="sessionFactory" />
        </property>
    </bean>
</mvc:interceptors>

assuming that sessionFactory is a reference to your SessionFactory bean.

You will also need to include the mvc namespace.

xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"

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