I have installed Openfire 3.10.3 on a Mac OS X 10.9.5.
When I start the server from the commandline I get the following error:
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/jivesoftware/openfire/starter/ServerStarter : Unsupported major.minor version 51.0
Looking at various postings it seems to be a problem with the Java version installed and the version of Java used to compile Openfire (I did not build Openfire). I have Java version 8 update 66 installed.
I am not too sure how to proceed - Any suggestions. By the way this 'problem' has been raised by somebody else on this forum : Openfire 3.10.2 and OS X Mavericks 10.9.5 5 months ago but this has not been answered.