Hi @justatest
there are too much missing informations.
What's the content of your certbot renew config?
Checking your domain there is a redirect http -> https - https://check-your-website.server-daten.de/?q=justatest.com
But your error says, that the http answer is wrong (not a https result). So you may have used a wrong authenticator that doesn't work with your Tomcat.