Resolution:

If you check Run configuration > Arguments > VM Arguments in Eclipse business studio, you can see that there exists a VM argument named '-Dorg.osgi.service.http.port=8090'. This parameter specifies BW AppNode's HTTP port. The port specified for this argument is used by the BW Management APIs to communicate with the AppNode i.e JVM OS process. If the port specified in this argument is already in use by any other appnode or any other OS process, Business Studio cannot launch the appnode and present this warning message. You can use "netstat -an" or external tool such as 'Cports' to check if the port that you want to use in Business Studio is being used by another process. You can then either free up that port or assign a new one in Studio.

One of the common cases this warning can be seen is BusinessStudio crash while the application is running or being debugged. In such cases, the eclipse process is crashed, however; the appnode's OS process still runs in the background, still occupying the port. In such cases, if the workspace is restarted and the user tries to start/debug the application, they will see this warning. In such cases, the user can simply search the existing running appnode process and kill it to re-launch the application.