Hope that you have get that both producer consumer bundles are ACTIVE when you issue osgi> ss greeting . You haven’t seen logs properly due to a problem of initializing or handling the Logger.

Check this and verify whether you have created a logger object correctly.

AnuradhaSK/greeting-card-manager

Then check here, whether you have added the required logs.

AnuradhaSK/greeting-card-manager

I would help you if you give more details and screenshots of your output.

Thanks