Could not open Hibernate Session for transaction

 

spring2.x+hibernate3+struts2 在首次登陆系统时抛出的异常，再登陆就正常。异常：javax.servlet.ServletException: org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.TransactionException: JDBC begin failed:  root cause org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.TransactionException: JDBC begin failed:   解决方案：1.给jdbc url 增加 autoReconnect=true 一定能解决你的问题，可以定期观察一下 show processlist改进方法如下：<property name="url" value="jdbc:mysql://localhost/数据库实例名称?&useUnicode=true&characterEncoding=utf-8&autoReconnect=true"/> 2.寻找支持重连的连接池。           注意：c3p0连接池支持重连;重连参数是:               idleConnectionTestPeriod   设置空闲连接测试周期               preferredTestQuery : 设置一查询语句，用于重连测试              testConnectionOnCheckin设置为true              testConnectionOnCheckout设置为true 在sessionFactory里配置：<property name="hibernateProperties">   <props>        <prop key="hibernate.autoReconnect">true</prop>   </props></property>