I am Chetan Savade from Symantec Technical Support team.
Macintosh system requirements
Mac OS X 10.6.8, 10.7 (32-bit, 64-bit); 10.8 (64-bit)
Mac OS X Server 10.6.8, 10.7 (32-bit, 64-bit); 10.8 (64-bit)
System Requirements for Symantec Endpoint Protection, Enterprise and Small Business Editions, and Network Access Control 12.1.2
@ Alberto Ravasio - It's very important in today's world to install Antivirus on MAC Operating System as well.
As per Alberto you can get Java here.
Helpful Link: Symantec Endpoint Protection for Macintosh Frequently Asked Questions
Technical Support Engineer
End Point Security