For Ubuntu/Linux
Step 1: Find the process id that is using the port 8080
netstat -lnp | grep 8080
or
ps -aef | grep tomcat
Step 2: Kill the process using process id in above result
kill -9 process_id
For Windows
Step 1: Find the process id
netstat -ano | findstr 8080
Step 2: Open command prompt as administrator and kill the process
taskkill /F /pid 1088
In my case port 8005 was already in use so I used the same above steps.