STOP TOMCAT SERVER USING TERMINAL
1- Find what application/process is using :
sudo netstat -lpn |grep :8080
and press Enter.
You will get an output similar to this one
tcp6 0 0 :::8080 :::* LISTEN 6782/java
2- I have got the process Id, which is 6782, now this is the process that is using port 8080.
3- Kill the process, type:kill 6782
kill -9 6782
and now port 8080 is free.