It should work fine if Tandem has at least a jdk 1.3. You might have to tweak the startup scripts a little.
I'd try at least 2.4.4 or 3 rc2
Let us know how it works.
we had a new requirement so we were figuring out, would JBoss run on Tandem for J2EE 1.3 spec (as the files we developed contains EJB2.0). As you said we have to meddle with the script files. Surely let u know once we can make JBoss running Tandem.