Its seems to me that you want to functionally test your application and are wondering what tools to use to do this. It is valid to ask for opinions in the QA/Test space because being QA's we will validate these opinions for our own cases before using them unlike programmers ;-)
As a test automation task this can actually be very simple , i'm guessing your ...
You already have something else on port 9000 that isn't sonar when you telnet in , it will need to be stopped before anything else can bind to that port.
use losf to find out which process it is
for more info on lsof see this, its not installed by default on a lot of distros.