how to kill java process forcefully and remove directory which is used by that process

I have one use case where I am killing a java process with pkill java, and after that, I want to remove certain directories. I have used rm -rf /pathtofolder but it gives: rm: cannot remove '/pathtofolder': Directory not empty Is there any way I can kill java forcefully, which allows me to remove directories (which are on an NFS share)? I am not sure how fuser will help here, or if I should use sleep 20 between pkill and rm commands. Please guide.