Could not open Hibernate Session for transaction

<property name="hibernateProperties">
   <props>

        <prop key="hibernate.autoReconnect">true</prop>

  </props>
</property>
 

pring2.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>

转自:http://episode.iteye.com/blog/323244

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