Could not obtain transaction-synchronized Session for current thread

配置session有誤:在項目中通常都是自動打開session和關閉session,須要在web.xml中加入以下代碼：

　　

<filter>  <filter-name>SpringOpenSessionInViewFilter</filter-name>  <filter-class>org.springframework.orm.hibernate4.support.OpenSessionInViewFilter</filter-class></filter><filter-mapping>  <filter-name>SpringOpenSessionInViewFilter</filter-name>  <url-pattern>/*</url-pattern></filter-mapping>這裏的singleSession的默認值爲true，也就是自動打開和關閉session