当tomcat关闭时，我在catalina.out日志文件中收到以下消息。我正在使用Tomcat 7.x和Tomcat JDBC数据源。

Mar 26, 2013 1:17:52 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc 
SEVERE: The web application [/my_webapp] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered. 
Mar 26, 2013 1:17:52 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads 
SEVERE: The web application [/my_webapp] appears to have started a thread named [MySQL Statement Cancellation Timer] but has failed to stop it. This is very likely to create a memory leak.

第一个声称DataSource已被强制取消注册，这样很好。但是，这很奇怪，因为我已经像这样配置了destroy-method：

<bean name="dataSource" class="org.apache.tomcat.jdbc.pool.DataSource" destroy-method="close">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    <property name="url" value="jdbc:mysql://localhost:3306/mydb"/>
    <property name="username" value="root"/>
    <property name="password" value="password"/>
</bean>

不知道为什么我得到第二个。关于“ MySQL语句取消计时器”的内容。

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编辑1：我尝试了@Zelldon建议的修复程序，它摆脱了第一个错误。但是MySQL Statement Cancellation Timer相关问题仍然存在