You need to know a variety of information pertaining to your
As detailed in the PrestoDB documentation.
$ ls -l /Library/Java/JavaVirtualMachines/ total 0 drwxr-xr-x@ 3 root wheel 102 26 Nov 2013 jdk1.7.0_45.jdk drwxr-xr-x 3 root wheel 102 9 Jan 2015 jdk1.7.0_72.jdk drwxr-xr-x 3 root wheel 102 3 Jun 00:45 jdk1.8.0_XX.jdk $