The Bull White Paper on JOnAS describes 4 different distribution
architectures which I'd like to experiment with, e.g.
all beans on one EJB server;
beans on different EJB servers on different machines.
My question is, how is a client supposed to lookup a bean when the bean
could be deployed on one of a number of machines? Up until now I've put
all the beans on the same server, and used rmiregistry to provide the
first reference to a bean's home interface. My assumption is that the
bean deployer is allowed to move beans from one host to another without
telling the clients.
My first thought was to have a single rmiregistry on host A, and
EJBServer running on hosts A, B and C, but all registering their beans'
home interface with the rmiregistry on host A. Then the client does
lookup() on host A. But I can't do this, I think for security reasons
you can't bind to a remote rmiregistry. So I conclude that each host
running EJBServer needs its own rmiregistry.
The only way I can see at the moment is to provide the client with a
list of rmiregistries where beans might possibly be registered. The
client would then dynamically change java.naming.provider.url and try
"env.lookup()" with each rmiregistry in the list until it succeeds.
Which doesn't seem like the right way of doing things.
Am i missing something obvious? Since this issue features prominently in
the white paper presumably someone has thought about how to do it.
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