Hibernate插入数据时报Could not open Hibernate Session for transaction异常

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在系统监控controller调用service把数据入库时，报了该异常：

 ERROR [Timer-2] timer.SystemMonitoringTimer (SystemMonitoringTimer.java:92)     - blingtel oops, got an exception:
org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.service.UnknownServiceException: Unknown service requested [org.hibernate.service.jdbc.connections.spi.ConnectionProvider]
    at org.springframework.orm.hibernate4.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:440)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:371)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:335)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:105)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:90)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
    at $Proxy27.save(Unknown Source)
    at com.blingtel.oam.systemmonitoring.timer.SystemMonitoringTimer.run(SystemMonitoringTimer.java:88)
    at java.util.TimerThread.mainLoop(Timer.java:512)
    at java.util.TimerThread.run(Timer.java:462)
Caused by: org.hibernate.service.UnknownServiceException: Unknown service requested [org.hibernate.service.jdbc.connections.spi.ConnectionProvider]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:126)
    at org.hibernate.internal.AbstractSessionImpl.getJdbcConnectionAccess(AbstractSessionImpl.java:255)
    at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.(JdbcCoordinatorImpl.java:75)
    at org.hibernate.engine.transaction.internal.TransactionCoordinatorImpl.(TransactionCoordinatorImpl.java:87)
    at org.hibernate.internal.SessionImpl.(SessionImpl.java:237)
    at org.hibernate.internal.SessionFactoryImpl$SessionBuilderImpl.openSession(SessionFactoryImpl.java:1801)
    at org.hibernate.internal.SessionFactoryImpl.openSession(SessionFactoryImpl.java:1009)
    at sun.reflect.GeneratedMethodAccessor56.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.springframework.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:191)
    at org.springframework.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:176)
    at org.springframework.orm.hibernate4.SessionFactoryUtils.openSession(SessionFactoryUtils.java:114)
    at org.springframework.orm.hibernate4.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:340)
    ... 11 more

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：打开数据库的重连接。
在sessionFactory里配置：

${hibernate.autoReconnect}

在资源文件中加入：

hibernate.autoReconnect=true

经过多次长时间的测试，已经不再报该异常了