I am currently using Keycloak for a proof of concept at my job working on the unemployment insurance application for the State of MN.  I love it, it is great.  There I am using Wildfly and everything is easy.  However, every second of my free time is spent writing www.metroseattlegamers.com (soon to be abecorn.com).  I have been working on that a long time.  It is three separate Spring applications tied together with REST and spring security for single sign on.  The main site is an oauth2 authorization provider; I use a combination of spring social, spring oauth/oauth 2 to let users share credentials between the apps of the site.  I spend a lot of time just keeping it all straight.  I very much want to use Keycloak for my own Spring project too.  Any suggestions how I might get that to work?  Do you have plans to make Keycloak compatible with Spring applications running on Tomcat?