[ubuntu] Trying to set Java JDK 7 as default application for .jar files & have hit a snag

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http://ubuntuforums.org – Java does not appear in the list of usable programs. I tried using the 'find programs online' button but it spit out an error (in a GUI text box): GDBus.Error:org.freedesktop.DBus.Python.xdg.Except ions.ParsingError: Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 489, in _inline_callbacks result = gen.send(result) File "/usr/lib/python2.7/dist-packages/sessioninstaller/core.py", line 1030, in _install_mime_types path)) File "/usr/lib/python2.7/dist-packages/xdg/DesktopEntry.py", line 33, in (Hardware)