No operations allowed after connection closed.错误

今天客户现场那边出现了一个诡异的问题,前台的错误提示为：

Caused by: org.hibernate.TransactionException: rollback failed

想着不会啊，这样的问题都能搞出来,真是牛啊.

于是拖下了日子,原来是程序与数据库断开连接了。

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.
at sun.reflect.GeneratedConstructorAccessor560.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1013)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:927)
at com.mysql.jdbc.ConnectionImpl.throwConnectionClosedException(ConnectionImpl.java:1205)
at com.mysql.jdbc.ConnectionImpl.checkClosed(ConnectionImpl.java:1197)
at com.mysql.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:4954)
at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnection.checkTransaction(BaseWrapperManagedConnection.java:547)
at org.jboss.resource.adapter.jdbc.WrappedConnection.checkTransaction(WrappedConnection.java:836)
at org.jboss.resource.adapter.jdbc.WrappedConnection.prepareStatement(WrappedConnection.java:250)
at sun.reflect.GeneratedMethodAccessor379.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.hibernate.engine.jdbc.internal.proxy.ConnectionProxyHandler.continueInvocation(ConnectionProxyHandler.java:138)
… 123 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure