Thanks for your reply, der_scheme. I have never manually added java on this OS installation; it's brand new.
Do I need a JDK from java 6, 7, or 8 (8 just came out)??? My mac is running OSX 10.9 "Mavericks", so whatever i choose also has to work in a 64-bit environment. i'm also playing Minecraft, which is only compatible with Java6, which is also pretty old. How do i install more than one number-revision of java and have both of them available for use? Thanks.