异常：
Caused by: org.hibernate.exception.GenericJDBCException: Cannot open connection at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:126) at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:114) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:52) at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:449) at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167) at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:142) at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:85) at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1353) at org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:558) ... 81 more
Caused by: java.sql.SQLException: com.mchange.v2.c3p0.ComboPooledDataSource [ java.beans.IntrospectionException: java.lang.reflect.InvocationTargetException [lastAcquisitionFailureDefaultUser] ] has been closed() -- you can no longer use it. at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.assertCpds(AbstractPoolBackedDataSource.java:447) at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getPoolManager(AbstractPoolBackedDataSource.java:459) at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128) at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:82) at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446) ... 86 more log4j:ERROR LogMananger.repositorySelector was null likely due to error in class reloading, using NOPLoggerRepository.
分析：
不知道这两个Caused by之间是什么关系，承接？并列？抑或因果！？还是其它。
第一个Caused by异常提示：
Caused
by: java.sql.SQLException: com.mchange.v2.c3p0.ComboPooledDataSource [
java.beans.IntrospectionException:
java.lang.reflect.InvocationTargetException
[lastAcquisitionFailureDefaultUser] ] has been closed() -- you can no
longer use it.
是在assertCpds后报的，应该也就是assertConnectionPoolDataSource，想要确认连接池数据源是否可用，但被告知you can no longer use it.
第
二个Caused by因为某些不知道的原因，它无法基于SQLState
handledSpecificException，得不到具体异常（或者根本就没有得到SQLState），只知道Cannot open
connection，为什么无法得到具体异常这个原因我觉得有兴趣可以去了解一下。
还有比较值得先去解决的问题是：
log4j:ERROR LogMananger.repositorySelector was null likely due to error in class reloading, using NOPLoggerRepository.
可能的解决方案：
http://blog.csdn.net/wang12/article/details/6659003
http://mymobile.iteye.com/blog/1058044
或者是log4j版本引起或者是设置或者其它
http://topic.csdn.net/u/20120524/09/6f4071b8-d551-4436-a913-58a359cde1ef.html?seed=408165219&r=78661532#r_78661532
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