我正在使用Spring 3.0.2,Hibernate 3.5.0和c3p0 0.9.1.2,当涉及到检索连接和提交事务时,我遇到了大量错误。这是我对c3p0的配置:
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="${jdbc.driverClassName}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="properties">
<props>
<prop key="c3p0.acquireIncrement">5</prop>
<prop key="c3p0.maxIdleTime">30</prop>
<prop key="c3p0.idleConnectionTestPeriod">20</prop>
<prop key="c3p0.maxPoolSize">100</prop>
<prop key="c3p0.maxStatements">0</prop>
<prop key="c3p0.minPoolSize">1</prop>
<prop key="user">${jdbc.username}</prop>
<prop key="password">${jdbc.password}</prop>
</props>
</property>
</bean>
直到最近,我经常遇到这个错误:
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
Last packet sent to the server was 0 ms ago.
最近我也得到了这些:
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Connection.close() has already been called. Invalid operation in this state.
java.sql.SQLException: Connections could not be acquired from the underlying database!
有什么建议吗?