org.hibernate.util.JDBCExceptionReporter

[hengyouyao]

原来在Tomcat里测试都是好好的，后来重新装了下Tomcat，测试就出错了。
log文件部分内容如下：
>>>>>>>LOG4J<<<<<<< 0 2009-04-27 17:54:49,328 ERROR [org.hibernate.util.JDBCExceptionReporter] - Connections could not be acquired from the underlying database!
>>>>>>>LOG4J<<<<<<< 1000 2009-04-27 17:54:50,328 ERROR [org.hibernate.util.JDBCExceptionReporter] - Connections could not be acquired from the underlying database!
>>>>>>>LOG4J<<<<<<< 1000 2009-04-27 17:54:50,328 ERROR [org.hibernate.tool.hbm2ddl.SchemaUpdate] - could not get database metadata
java.sql.SQLException: Connections could not be acquired from the underlying database!
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:104)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:264)
at com.mchange.v2.resourcepool.BasicResourcePool.awaitAcquire(BasicResourcePool.java:972)
at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:208)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:260)
... 52 more
>>>>>>>LOG4J<<<<<<< 1093 2009-04-27 17:54:50,421 ERROR [org.hibernate.tool.hbm2ddl.SchemaUpdate] - could not complete schema update
java.sql.SQLException: Connections could not be acquired from the underlying database!
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:104)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:264)
at com.mchange.v2.c3p0.PoolBackedDataSource.getConnection(PoolBackedDataSource.java:94)

... 52 more
>>>>>>>LOG4J<<<<<<< 29156 2009-04-27 17:55:18,484 ERROR [org.hibernate.util.JDBCExceptionReporter] - Connections could not be acquired from the underlying database!
>>>>>>>LOG4J<<<<<<< 29172 2009-04-27 17:55:18,500 ERROR [org.hibernate.util.JDBCExceptionReporter] - Connections could not be acquired from the underlying database!
>>>>>>>LOG4J<<<<<<< 90312 2009-04-27 17:56:19,640 ERROR [org.hibernate.util.JDBCExceptionReporter] - Connections could not be acquired from the underlying database!
>>>>>>>LOG4J<<<<<<< 90312 2009-04-27 17:56:19,640 ERROR [org.hibernate.util.JDBCExceptionReporter] - Connections could not be acquired from the underlying database!
>>>>>>>LOG4J<<<<<<< 90312 2009-04-27 17:56:19,640 ERROR [org.hibernate.util.JDBCExceptionReporter] - An SQLException was provoked by the following failure: com.mchange.v2.resourcepool.ResourcePoolException: A ResourcePool cannot acquire a new resource -- the factory or source appears to be down.
>>>>>>>LOG4J<<<<<<< 90312 2009-04-27 17:56:19,640 ERROR [org.hibernate.util.JDBCExceptionReporter] - An SQLException was provoked by the following failure: com.mchange.v2.resourcepool.ResourcePoolException: A ResourcePool cannot acquire a new resource -- the factory or source appears to be down.
请多多指教。

[Dantin]

你有把所有JAR都放进去吗，还有数据库服务开了没?

[hengyouyao]

JAR本来就放在当前web应用的lib目录下，并没有直接放到Tomcat的lib目录下，没有做任何修改；
数据库服务开了。

[ben0759]

Connections could not be acquired from the underlying database!
数据库连接出现了问题，问题很有可能是以下几个：
你使用的是不是jndi，连接池跟tomcat有关，你是不是没有配置应用跟tomcat?
在数据库那边，你检查一下，用其他程序能不能连接到数据库。
主要应该不是tomcat的问题，我怀疑是你tomcat的配置出什么问题了，你试下用这个tomcat，跟其他应用看看可以一起使用不。

[西瓜]

这个问题 很显然
Tomcat\lib 下面没有 JDBC驱动包
拷一个JDBC驱动包到Tomcat\lib 下面
问题 就应该解决了

[gyheihei]

很明显，链接数据库错误。请检查链接的URl参数、用户名密码和数据库驱动是否正常。可以先去掉连接池试一下。

[gyheihei]

很明显，链接数据库错误。请检查链接的URl参数、用户名密码和数据库驱动是否正常。可以先去掉连接池试一下。

[ET郭强]

支持下，

[dxpws]

数据库驱动 tomcat lib?

[永恒之星ACE]

这个问题我也遇到，我在C/S的情况遇到的。本地连接没问题只要开远程连接就出问题。
所以我判断跟用户名密码和数据库驱动是否正常没有太大关系。跟tomcat也没有关系。
因为，我没有用tomcat.报的错误是相同的。
我的判断是，可能是连接的释放问题，或连接权限问题。

[hengyouyao]

按照以上回复查找错误，任然没有解决，请大家继续多提宝贵意见，越详细越好。提前祝愿大家节日快乐！

[阿贝啊啊]

我这两天也碰到了相同的问题，我是把原来运行成功的系统装到别的电脑上时。昨天是不行的，错误跟你一模一样，但昨天好了，也可以正常运行，今天早上又出现了相同的错误，我把机器重启了一下，又好了，但下午又不行了。这时我的真实经历，希望对你有帮助。祝你好运，兄弟！


Exception in thread "main" org.hibernate.exception.GenericJDBCException: Cannot open connection
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:426)
at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:144)
at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:119)
at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:57)
at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1326)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:301)
at $Proxy0.beginTransaction(Unknown Source)
at com.kettas.util.HibernateUtil.beginTransaction(HibernateUtil.java:17)
at com.kettas.biz.impl.UserBizImpl.insertUser(UserBizImpl.java:27)
at com.kettas.util.TestUserBiz.main(TestUserBiz.java:16)
Caused by: 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)
at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)
at org.hibernate.connection.C3P0ConnectionProvider.getConnection(C3P0ConnectionProvider.java:56)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:423)
... 13 more
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)
... 16 more

[阿贝啊啊]

我这两天也碰到了相同的问题，我是把原来运行成功的系统装到别的电脑上时。前天是不行的，错误跟你一模一样，但昨天好了，也可以正常运行，今天早上又出现了相同的错误，我把机器重启了一下，又好了，但下午又不行了。这时我的真实经历，希望对你有帮助。祝你好运，兄弟！

[ameyume]

帮顶，是不是tomcat设置有问题？

[抬头望远，低头沉思]

[Quote=引用楼主 hengyouyao 的帖子:]
原来在Tomcat里测试都是好好的，后来重新装了下Tomcat，测试就出错了。
log文件部分内容如下：
>>>>>>>LOG4J < < < < < < < 0 2009-04-27 17:54:49,328 ERROR [org.hibernate.util.JDBCExceptionReporter] - Connections could not be acquired from the underlying database!
>>>>>>>LOG4J < < < < < < < 1000 2009-04-27 17:54:50,328 ERROR [org.hibernate.util.JDBCExceptionReporter] - Connections could not be acq…
[/Quote]
我个人认为是连接池出现的错误
你的连接池和你tomcat有关
你原来的连接池里面的连接没有释放掉
造成的无法获取

[joyo2008]

改改VO的类型，如：数据中用的NUMBER(14)，而VO里面用的是Integer就会出现这个问题！
可以把VO里面的类型改为Long，就可以了

[a455275088]

添加个数据库驱动包就可以了 比如ojdbc14.jar 放在lib里