I'm very interested in this topic too.
Let me answer by a question:
what happens if two clients bind at the same time on the same non-clustered JNDI tree?
In non-clustered JNDI context the javax.naming.NameAlreadyBoundException is thown...
Will it also be thows in the clustered JNDI?
oh yes, sorry, I thought you meant: what happens when you do two rebinds at the same time!