Tomcat doesn't start or refresh

 If you stop and start Tomcat but it looks like your changes don't appear, try to check at your processes running in background.
If you use Linux do as following:

- Stop your tomcat server
  /tomcatDir/bin/shutdown.sh

- Open a shell and type:
  ps aux | grep tomcat

- Delete all the occurence of tomcat with the kill command
  kill -9 number_of_process

!! Be careful not to kill your friend tomcat !!

- Start tomcat again
  /tomcatDir/bin/startup.sh