NO.5 hibernate3.3.2 hibernateTemplate load对象页面显示时报错

最新推荐文章于 2025-11-27 10:55:11 发布

原创最新推荐文章于 2025-11-27 10:55:11 发布 · 70 阅读

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#java

本文介绍了Hibernate框架中懒加载机制导致的LazyInitializationException异常，并提供了两种解决方案：一是通过设置实体类的proxy属性为false；二是使用Spring提供的OpenSessionInViewFilter过滤器，在视图渲染完成前保持Session打开状态。

引用：http://blog.163.com/moshen128@126/blog/static/13542109620104135628662/
错误信息：

16:49:00,357 ERROR LazyInitializationException: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 com.xs.registration.model.User_$$_javassist_0.getUsername(User_$$_javassist_0.java)
16:49:05,975 ERROR LazyInitializationException: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 com.xs.registration.model.User_$$_javassist_0.toString(User_$$_javassist_0.java)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

解决：

Entity bean的porxy属性默认是true,会有延迟

在entity

@proxy(lazy=false)，会降低性能

解决2：openSessionInView配置成在页面返回给客户端前关闭session


<filter>
<filter-name>openSessionInView</filter-name>
<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>openSessionInView</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>



<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>

</filter>