更新时间:2021-10-13 15:52:31
See this answer. It seems that MySQL driver should be in {$TOMCAT]/lib
shared between applications. Check that you are not including it with each application. At least it worked for me and I have been able to remove the warning.
如果您使用的是Maven,请标记提供的依赖项.
If you are using Maven mark the dependency as provided.
更新:
根本原因是Tomcat遇到了垃圾回收驱动程序的问题,因为它是在多个应用程序通用的单例中注册的.关闭一个应用程序不允许Tomcat释放驱动程序.参见此 answer .
UPDATE:
root cause is that Tomcat have problems to garbage collect the driver because it is registered in a singleton common to several applications. Closing one application does not allow Tomcat to release the driver. See this answer.