Hibernate连接池断开自动重连

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>