The import javax.servlet cannot be resolved

This issue comes up when you change/upgrade the server currently running the application.
The fix is in your Java Build Path make sure the server runtime library is compatible with the server you are running your application on.

Release port under use in windows

We will release port 8080 here which is being used by windows

The Error:

The Solution:

Let's first run the following commands in order

1. netstat -a -o -n: This will provide us the process id of the process which is using the port.We find that process 4516 is using our port 8080 and we need to kill it.

     2. Next run the command taskkill /F /PID 4516 : This will kill the process.Make sure you have opened command prompt in administrative mode.