Tomcat stop时c3p0连接池线程无法关闭警告

问题：

数据源采用c3p0数据库连接池。停止tomcat服务时，发出警告：

“严重: The web application [/XXX] appears to have started a thread named [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0] but has failed to stop it. This is very likely to create a memory leak.”

XXX是工程名称。

解决：

在数据源配置中增加 destroy-method="close" 配置。