When I run Tomcat under IntelliJ, somehow I get old classes, at least in part.

I know this happens because I can delete diagnostic log messages in my code and there will still be there when I run the app under the local Tomcat. (I hope this has not been happening on the actual remote app!) I can also rename classes that will appear in a stack trace and moving methods to other files and classes and the stack trace will still reflect my older version.

I've tried deleting the caches and restarting, rebuilding the app, rebuilding the artifacts. I've tried even deleting some class files.

So I figured out how to set up Jetty and ran it on a local Jetty. That was successful and I got the new class versions instead of the old.

I went back to Tomcat and tried "Clear contents", deleting my deployments and other things and it didn't work.

So finally I deleted the Tomcat server and downloaded a Tomcat Server from the internet and configured it in IntelliJ. That worked, but surely that is.not the intended way to do things after every program change! I'm on Mac, by the way, and on Ultimate 2021.1.