To use from command line:
Supply (at least) the following required configuration in application.conf:
youtube.oauth.pathToP12KeyFile
youtube.oauth.serviceAccountEmailAddress
youtube.apiKey
youtube.youtubeUsers
Launch using:
mvn exec:java -Dexec.mainClass=org.apache.streams.youtube.provider.YoutubeUserActivityProvider -Dexec.args="application.conf tweets.json"