The Fedlet has the following requirements:
Oracle OpenSSO 8.0 Update 2 supported web container, if you plan to deploy the fedlet.war, or a Java service provider application that is integrated with the Fedlet. See the Hardware and Software Requirements For OpenSSO 8.0 Update 2.
Microsoft Internet Information Server (IIS) 7.0 and later, if you plan to deploy the .NET Fedlet
JDK 1.6.x and later