Illegal Access: This web application instance has been stopped already. cocould not load com. MySQL. JD

9:30:46 org. Apache. Catalina. loader. webappclassloader loadclass
Information: Illegal Access: This web application instance has been stopped already. cocould not load COM. mySQL. JDBC. util. the eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused
The illegal access, and has no functional impact.
Java. Lang. illegalstateexception
At org. Apache. Catalina. loader. webappclassloader. loadclass (Webappclassloader. Java: 1273)
At org. Apache. Catalina. loader. webappclassloader. loadclass (Webappclassloader. Java: 1233)
At com. MySQL. JDBC. communicationsexception. <init> (Communicationsexception. Java: 180)
At com. MySQL. JDBC. mysqlio. Send (Mysqlio. Java: 2652)
At com. MySQL. JDBC. mysqlio. Quit (Mysqlio. Java: 1345)
At com. MySQL. JDBC. Connection. realclose (Connection. Java: 4731)
At com. MySQL. JDBC. Connection. Cleanup (Connection. Java: 2034)
At com. MySQL. JDBC. Connection. Finalize (Connection. Java: 3244)
At java. Lang. Ref. finalizer. invokefinalizemethod (native method)
At java. Lang. Ref. finalizer. runfinalizer (unknown source)
At java. Lang. Ref. finalizer. Access $100 (unknown source)

At java. Lang. Ref. finalizer $ finalizerthread. Run (unknown source)

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Tomcat re-loads the web application failure. When an application is uninstalled, it does not close all threads. When tomcat has closed its class loader, some threads continue to run, which leads to errors. However, this does not affect normal use. No matter whether the impact is not affected, it is difficult to see the exception information.