Spring+Hibernate设置lazy=ture
设置lazy=true时会出现如下错误：

<filter><filter-name>hibernateFilter</filter-name><filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class><init-param><param-name>sessionFactoryBeanName</param-name><param-value>Spring配置中的SessionFactory名</param-value></init-param><init-param><param-name>singleSession</param-name><param-value>false</param-value></init-param></filter><filter-mapping><filter-name>hibernateFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping>