Hi,
I use Ubuntu 14.4 and openfire 3.9.3 i have java 7 installed in my system, please see the acutal error log i pasted above.
the issue is..even plugins that i installed from the openfire available plugins are not showing up in installed plugins, it says it will show up after a while and i wait forever and nothing happens, and when i go back to the available plugins, they are still there but without the install icon by the side.