登录异常：Could not open Hibernate Session怎么办？

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>

我在用Struts+Spring+Hibernate时遇到了Could not open Hibernate Session for transaction最后我解决了这个问题。我现在把问题贴在了下面！我最终确定是因为数据链接自动关闭，而不是spring和hibernate的问题。

解决办法是：

1.看看数据库的jdbc驱动是否支持重连

注意：mysql的重连autoReconnect参数不能使连接重连

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

javax.servlet.ServletException: Could not open Hibernate Session for transactionnested exception is org.hibernate.TransactionException: JDBC begin failed:

org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:535)

org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:433)

org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)

org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)

org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)

javax.servlet.http.HttpServlet.service(HttpServlet.java:709)

javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:78)

org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)

com.p3g.common.SessionFilter.doFilter(SessionFilter.java:58)

root cause

org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transactionnested exception is org.hibernate.TransactionException: JDBC begin failed:

org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:524)

org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:322)

org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:255)

org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:102)

org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:176)

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