See http://docs.oracle.com/cd/E23943_01/doc.1111/e14142/prepare.htm#i1168506. Coherence is optional, so you may omit it while installing Deevlopment.
I'am installing forms 11gr2 11.1.2, in a developement way on windows. The question is regarding the pre-requisite Weblogic Server install. what are the minimum components i have to install to be the more light as possible? Especially, I'm wondering if I have to install coherence ? (I don't exactly know what does this product)