Could not obtain transaction-synchronized Session for current thread

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配置session有误:在项目中一般都是自动打开session和关闭session,需要在web.xml中加入如下代码：

　　

<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>

这里的singleSession的默认值为true，也就是自动打开和关闭session









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