无法初始化代理 - 再次没有会话

Question

查看页面时收到这些错误日志，

ERROR [TP-Processor11] (LazyInitializationException.java:42) - could not initialize proxy - no Session
org.hibernate.LazyInitializationException: could not initialize proxy - no Session
    at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:132)
    at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:174)
    at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:190)
    at org.osmoz.contents.model.enm.ContentType_$$_javassist_71.getDefaultShortMode(ContentType_$$_javassist_71.java)
    at org.osmoz.contents.web.tapestry.components.EnmContentZone.getTemplate(EnmContentZone.java:67)
    at org.osmoz.contents.web.tapestry.base.AbstractRawContentZone.getContent(AbstractRawContentZone.java:67)
    at $PropertyConduit_1276091af82.get($PropertyConduit_1276091af82.java)
    at org.apache.tapestry5.internal.bindings.PropBinding.get(PropBinding.java:58)
    at org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl$1.read(InternalComponentResourcesImpl.java:510)
    at org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl$1.read(InternalComponentResourcesImpl.java:496)
    at org.apache.tapestry5.corelib.components.OutputRaw._$read_parameter_value(OutputRaw.java)
    at org.apache.tapestry5.corelib.components.OutputRaw.beginRender(OutputRaw.java:43)
    at org.apache.tapestry5.corelib.components.OutputRaw.beginRender(OutputRaw.java)
    at

我知道问题是会话已关闭。但我真的不知道为什么这个错误发生得不那么频繁，为什么我不知道根本原因是什么。

环境：

Tapestry5、JPA、Hibernate 3.3.2.GA

我已

<filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>

在 web.xml 中 设置 还

Answer 1

在使用 @Service（Spring 服务）注释的层中的方法上使用 @Transactional。