I try to activate an addon manually. I went to the openhab2-addons folder and did a maven build of the russound addon. It went fine - the build was successful!
I placed to corresponding jar-file into the runtime folder and activated the new discovered addon by typing “bundle:start 235”. Afterwards I got an exception, here
openhab> bundle:start 235
Error executing command: Error executing command on bundles:
Error starting bundle 235: Could not resolve module: org.openhab.binding.russound 
Unresolved requirement: Import-Package: com.google.gson; version="[2.8.0,3.0.0)"
It seems that I need to install the dependancies before I can successfully start the addon.
How do I get this done? Is there an opportunity to deal with dependancies efficiently - it seems pretty inefficient to do this manually. Thanks in advance for your reply.