求助：使用C3P0出错！? 400 报错

求助：使用C3P0出错！? 400 报错

配置文件的所有内容：

c3p0.jdbcUrl=jdbc:oracle:thin:@XXX.XXX.XXX.XXX:1521:ora10g
c3p0.driverClass=oracle.jdbc.driver.OracleDriver
c3p0.user=XXX
c3p0.password=XXX
c3p0.minPoolSize=3
c3p0.maxPoolSize=20

com.mchange.v2.log.MLog=com.mchange.v2.log.log4j.Log4jMLog
com.mchange.v2.log.NameTransformer=com.mchange.v2.log.PackageNames
com.mchange.v2.log.FallbackMLog.DEFAULT_CUTOFF_LEVEL=ALL

获取连接代码：

ComboPooledDataSource cpds = new ComboPooledDataSource();
conn = cpds.getConnection();

log4j:WARN No appenders could be found for logger (com.mchange.v2.log.MLog).

log4j:WARN Please initialize the log4j system properly.

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 c3p0.testc3p0.main(testc3p0.java:21)

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)

... 2 more