Java Problem

I am using Jbuilder 2005 and I need to create a application where I use generics. But once I create the class that implements the generics portion of the code, I get an error that says "generics are not supported in -source 1.2 (try -source 1.5 to enables generics)". Any one know what this means, or how to solve it...?

[327 byte] By [ace_84a] at [2007-11-26 14:38:15]