十一月 12, 2014 4:09:34 下午 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet [servlet.OrderServlet] in context with path [/Q-Eat] threw exception
org.hibernate.SessionException: Session is closed!
at org.hibernate.impl.AbstractSessionImpl.errorIfClosed(AbstractSessionImpl.java:72)
at org.hibernate.impl.SessionImpl.getTransaction(SessionImpl.java:1342)
at dao.impl.OrderDaoImpl.getOrderNum(OrderDaoImpl.java:291)
at servlet.OrderServlet.doPost(OrderServlet.java:322)
at servlet.OrderServlet.doGet(OrderServlet.java:48)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
------解决思路----------------------
方法一：你可以使用getCurrentSession 你配置的spring事物会自动帮你处理关闭 不需要手动关闭；
方法二：你如果想自己处理事物一级session，就不要配置spring的声明式事物。这样用完你可以自己关闭；
千万不要：即采用spring声明事务 有采用 手动关闭 会出现不可预见错误 ，这点我研究很久。没有发现好的办法处理混合使用，最终 我的策略是 只会用一种 希望对你有帮助；
------解决思路----------------------
你把这里的代码
at dao.impl.OrderDaoImpl.getOrderNum(OrderDaoImpl.java:291)
和调用这个方法的service层代码 方便的话发一下。