If you need to access a Metasys web interface, created by Johnson Controls, that is running 6.5 or later, try downloading their Mac app which has a JRE builtin:

http://johnsoncontrols.com/launcher/macdownload

or, if that doesn’t work, try this:

http://www.johnsoncontrols.com/content/dam/WWW/jci/be/launcher/Launcher.dmg