Tomcat 9, MySQL 8 and orgin header

[tuotuoZ]

We may want to upgrade to Tomcat 9 and MySQL 8 just for better security practice. To update MySQL 8, we need to update java dependency in one of the XML file.

Since I am using an Apache server on top of Tomcat, there is a extra header issue may occur in the future. The solution is to here: https://metamug.com/article/networking/lets-encrypt-ssl-on-tomcat.html#mapping-domain-name-to-tomcat