This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
ROOT does not mean what you think it means.
ROOT is the "default" web application. The one that is accessed if the url doesn't match any existing contexts.
Your WEB-INF directory must always be in the top level of your web application to have any effect.
Because you have yours in webapps/ROOT/test_jsp/WEB-INF, it doesn't recognise it as valid. As a result it doesn't recognise the classes directory, and can't find your java class.
Move your test_jsp folder up a level from ROOT to webapps. ie: webapps/test_jsp
Restart your server.
Things should start working as you expect at that point.