c3p0连接超时：com.mchange.v2.resourcepool.TimeoutException

异常信息：

13:07:04.315 [main] DEBUG com.mchange.v2.sql.SqlUtils - Converting Throwable to SQLException...
com.mchange.v2.resourcepool.TimeoutException: A client timed out while waiting to acquire a resource from com.mchange.v2.resourcepool.BasicResourcePool@4c2bb6e0 -- timeout at awaitAvailable()
    at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1467)
    at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:644)
    at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:554)
    at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:758)
    at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:685)
    at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:140)
    at org.springframework.jdbc.datasource.DataSourceUtils.fetchConnection(DataSourceUtils.java:157)
    at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:115)
    at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:78)
...

在spring配置c3p0的信息如下：

<!--配置数据库连接池：c3p0-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <!--配置连接池属性-->
    <property name="driverClass" value="${jdbc.driver}"/>
    <property name="jdbcUrl" value="${jdbc.url}"/>
    <property name="user" value="${jdbc.username}"/>
    <property name="password" value="${jdbc.password}"/>

    <!--配置数据库连接池的私有属性-->
    <!--连接池的最大连接数量-->
    <property name="maxPoolSize" value="30"/>
    <!--连接池的最小连接数量-->
    <property name="minPoolSize" value="10"/>
    <!-- 关闭连接后不自动commit-->
    <property name="autoCommitOnClose" value="false"/>
    <!--连接失败的重试次数-->
    <property name="acquireRetryAttempts" value="2"/>
    <!--获取连接超时时间-->
    <property name="checkoutTimeout" value="1000"/>
</bean>

将连接超时时间改大一点即可，具体如下：

<property name="checkoutTimeout" value="5000"/>