Connections could not be acquired from the underlying database

[WARN] 2011-05-02 00:16:32,786 org.hibernate.cfg.SettingsFactory - Could not obtain connection metadata
java.sql.SQLException: Connections could not be acquired from the underlying database!
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:529)………………
Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.
at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1319)
at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557)
at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525)
... 44 more
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这只是截了一些输出的信息，觉得很奇怪，数据的配置没有改动过，数据库的端口是1433，也没有问题，连接用的用户密码也没有问题。今天早上连接还是没有问题的，只是改了一个JSP的代码，也不会至于数据连不上了。还有试过了重启数据服务！！！求各位大鸟求助，真的找不出原因了~~~~~