Tomcat has a class org.apache.catalina.util.ServerInfo which you can
run to find out the version of Tomcat, if you don't trust the
directory in which it is installed, of course 😉
$ cd /path/to/tomcat/install
$ java -cp lib/catalina.jar org.apache.catalina.util.ServerInfo
Server version: Apache Tomcat/9.0.4
Server built: Jan 18 2018 19:42:17 UTC
Server number: 9.0.4.0
OS Name: Linux
OS Version: 4.9.0-3-amd64
Architecture: amd64
JVM Version: 1.8.0_144-b01
JVM Vendor: Oracle Corporation
Apart from Server version, I find Server built pretty
interesting. It's good to know how ancient the version I'm running is
😄
