使用ssh时出现的异常总结

1.org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role

添加过滤器，并且放在web.xml的最前面，所有过滤器的最前面，这样子可以避免好多问题

<!-- 打开session --><filter><filter-name>openSessionInViewFilter</filter-name><filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class><init-param><param-name>singleSession</param-name><param-value>false</param-value></init-param></filter><filter-mapping><filter-name>openSessionInViewFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping>