数据库连接池用的是c3p0 配置如下
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="user" value="${user}" />
<property name="password" value="${password}" />
<property name="jdbcUrl" value="${jdbcUrl}" />
<property name="driverClass" value="${driverClass}" />
<property name="maxPoolSize" value="${c3p0.maxPoolSize}"/>//100
<property name="minPoolSize" value="${c3p0.minPoolSize}"/>//10
<property name="initialPoolSize" value="${c3p0.initialPoolSize}"/>//10
<property name="maxIdleTime" value="${c3p0.maxIdleTime}"/> //100
<property name="acquireIncrement" value="${c3p0.acquireIncrement}"/>//5
<!--
<property name="acquireRetryAttempts" value="${c3p0.acquireRetryAttempts}"/> //5
-->
<property name="acquireRetryDelay" value="${c3p0.acquireRetryDelay}"/>//10
<property name="autoCommitOnClose" value="${c3p0.autoCommitOnClose}"/>//true
<property name="checkoutTimeout" value="${c3p0.checkoutTimeout}"/>//100
<property name="idleConnectionTestPeriod" value="${c3p0.idleConnectionTestPeriod}"/>//60
<!--
<property name="numHelperThreads" value="${c3p0.numHelperThreads}"/>//5
-->
</bean>
数据库使用的是oracle10g (数据库设置时200个连接)
bug现象：
有时能正常获取数据库的连接，有时不能获取数据库的连接。不能获取数据库的连接时，我查看了数据库中的空闲的连接有很多。并且数据库中的连接的状态只有一个是active。连接发生异常信息为
org.springframework.jdbc.UncategorizedSQLException: Hibernate operation: Cannot open connection; uncategorized SQLException for SQL [???]; SQL state [null]; error code [0]; An attempt by a client to checkout a Connection has timed out.; nested exception is java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.。希望大家能给以不同意意见，如果有以前遇到并解决的大侠，请教小弟。谢谢！！！！！
