java address already in use code example

Example 1: address already in use

# To see ports in use
sudo lsof -i -P -n | grep LISTEN 
sudo netstat -tulpn | grep LISTEN

Example 2: address already in use :::8081 windows

netstat -a -n -o 
//then find the pid which is running in this port and run 
taskkill /F /PID [pidnumber]