jboss clustering when one machine isn't big enough to run application

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http://serverfault.com – Im given a problem and am currently trying to come up with the best way to solve it. I have a few ideas, but one question about jboss clustering. keep in mind these applications were written very poorly, thats why they require so much memory and there is nothing i can do about that right now. Now, I have clustered applications on Jboss where the application was small enough to run on one box. Meaning if i needed to, one machine could handle the load. But the current problem is that i have been asked to run several systems on the same environment. Our machines are virtuals and due to limited h (HowTos)