I have been successfully using the embedded java release from sun (oracle) for a while now and it works well. You can get it from http://www.oracle.com/technetwork/java/javase/downloads/embedded-jsp-135769.html. This supports jdk SE 6.
From: Liem Leong [mailto:email@example.com]
Sent: Monday, 1 November 2010 8:50 PM
To: General mailing list for gumstix users.
Subject: [Gumstix-users] sudo apt-get install and jdk6
1. Why can't I run sudo apt-get install in OMAP3-desktop?
2. I need jdk 6, how do I do that? I can managed to install jamvm but it 1.5 is not good enough for our application which is based in jdk 1.6.