jOverseer on Mac

by default jOverseer will be installed at /Applications/jOverseer.app/

To check the version of Java

from a terminal

$ /usr/libexec/java_home

will list the current java in use

$ /usr/lib/exec/java_home -V

will list all the versions of java available

from a terminal you can try and start jOverseer and see the java errors...

$ cd /Applications/jOverseer.app/Contents/Java

$ java -jar jOverseer.jar

the java settings for the java Virtual Machine when running jOverseer from the Launch Pad are in /Applications/jOverseer.app/Contents/Info.pList which is an XML file.