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java.sql.SQLException: 关闭的连接解决办法

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程序如果长时间不进行数据库操作，那么数据源中的 Connection 很可能已经断开。其原因有可能是防火墙，或者连接的数据库设置的超时时间。这里使用的是 C3P0 连接 oracle 数据库，引起的异常信息为：

org.springframework.transaction.TransactionSystemException: Could not roll back Hibernate transaction; nested exception is org.hibernate.TransactionException: rollback failed

at org.springframework.orm.hibernate4.HibernateTransactionManager.doRollback(HibernateTransactionManager.java:503)

at org.springframework.transaction.support.AbstractPlatformTransactionManager.processRollback(AbstractPlatformTransactionManager.java:845)

at org.springframework.transaction.support.AbstractPlatformTransactionManager.rollback(AbstractPlatformTransactionManager.java:822)

at org.springframework.transaction.interceptor.TransactionAspectSupport.completeTransactionAfterThrowing(TransactionAspectSupport.java:411)

at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:114)

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.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:622)

at com.platform.dao.TasksDAO$$EnhancerByCGLIB$$abcb28f5.getTaskById(<generated>)

at com.platform.manager.TasksManager.getTaskById(TasksManager.java:287)

at com.platform.manager.TasksManager.checkResult(TasksManager.java:300)

at com.platform.timer.TimerBase.tasksListener(TimerBase.java:149)

at com.platform.timer.TimerBase.run(TimerBase.java:81)

at java.util.TimerThread.mainLoop(Timer.java:555)

at java.util.TimerThread.run(Timer.java:505)

Caused by: org.hibernate.TransactionException: rollback failed

at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.rollback(AbstractTransactionImpl.java:215)

at org.springframework.orm.hibernate4.HibernateTransactionManager.doRollback(HibernateTransactionManager.java:500)

... 15 more

Caused by: org.hibernate.TransactionException: unable to rollback against JDBC connection

at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doRollback(JdbcTransaction.java:167)

at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.rollback(AbstractTransactionImpl.java:209)

... 16 more

Caused by: java.sql.SQLException: 关闭的连接

at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:111)

at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:145)

at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:207)

at oracle.jdbc.driver.PhysicalConnection.rollback(PhysicalConnection.java:1160)

at com.alibaba.china.jdbc.proxy.simple.ConnectionProxy.rollback(ConnectionProxy.java:228)

at com.mchange.v2.c3p0.impl.NewProxyConnection.rollback(NewProxyConnection.java:855)

at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doRollback(JdbcTransaction.java:163)

... 17 more

异常抛出的地方为 Spring 的事务管理 transactionManager，而并非程序代码。即便捕捉到异常，使用 sessionFactory.openSession 也会抛出如下异常：