Why do I get a "java.net.BindException:Address in use" error?

Probably because the address is in use :-)

You're already running an instance of your servlet engine, or another service is running on its port. Make sure the other service is fully stopped before launching another one.

See also

• How do I fully shut down the server?
• Why doesn't Tomcat shut down when I run shutdown.bat (or shutdown.sh)?
• How do you shut down JServ safely if you've started it (manual mode), such that the destroy() methods of the existing servlet classes are invoked?