java.lang.IllegalStateException: 非法访问：此 Web 应用程序实例已停止

Question

I study web application with Spring. My development environment is

• SpringToolSuite (ver 3.9.6),
• Tomcat (8.5)
• JDK (1.8)

I write source like in the textbook and run that code, but error message has been shown:

The full message is this.

**java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load []. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.**

The source works properly, but after a few seconds, the following error message comes out.

If you know solution, I hope you let me know.

Answer 1

This is because of application servers like tomcat caching your old application. Try to restart it.

Answer 2

Right button in your Tomcat in Servers, then 'Clean', and try to running again. As other users replied, the tomcat is caching the old application