I was doing work on an IBM AS/400 mainframe in my previous job, just over a decade ago. It supported Java and Tomcat (which was fairly current at the time) out

I was doing work on an IBM AS/400 mainframe in my previous job, just over a decade ago. It supported Java and Tomcat (which was fairly current at the time) out of the box. The only oddity I needed to deal with was making sure I had a proper JDBC driver for its DB/2 database. Don't get me wrong, I'm glad I don't have to deal with it anymore, but mainframes are definitely still around.