This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
RHEL 5 is old (release in 2007). You might want to stick with JDK 5 and use JBoss AS 5.1.0. But you could always try JDK 7 and JBoss AS 7. I have no idea whether Oracle 10G Forms and Reports will work on either of them.