I am using the online version of openHAB2 with the latest update (as of last night), running on Ubuntu 16.04.
(BTW; I see people on the forum are referring to this and that version, but I have never figured out how to determine what version I have installed. Anyone?)
Back on topic…
I am also running the MQTT 1.9.0 binding.
Every time I upgrade openHAB and have to re-install the bindings (through the addons.cfg file) I notice the following in the log file:
2016-11-25 18:42:52.360 [ERROR] [core.karaf.internal.FeatureInstaller] - Failed installing 'openhab-binding-mqtt': Permission denied
As far as I can tell, however, the binding is correctly installed and started, as indicated by these lines in the log (following directly after the error message above):
2016-11-25 18:42:57.398 [INFO ] [penhab.io.transport.mqtt.MqttService] - MQTT Service initialization completed.
2016-11-25 18:42:57.399 [INFO ] [t.mqtt.internal.MqttBrokerConnection] - Starting MQTT broker connection 'mosquitto'
I anyone else seeing this?