RMI Callback messages can not be sent to all clients

we I send a message to all clients using RMI Callback the message dont arrive to all clients when one or more clients is disconnected without removing themselves from the hashtable at the server side .
how i can know if the client is disconnected before sending the message to him using RMI callback taking into account that the client dosnt tell the server when he has disconnected.
please i want a solution to this problem.
thanks

You seem to be making this a little complicated. During the login (or sometime) have one of the parms that are passed back to the server be a remote object on the client. It can have a nice interface like
public void callMe(Object obj) throws .... or you could get cute and add
pubic void shutDown() throws.... but this could be handled in the other method.
During the call the client becomes the server and the server the client. The callMe method has no clue as to what thread it is on so it should just quickly queue up whatever it has gotten and return. It should not be doing work that will effect the Awt thread. If the client is no longer there then you should be able to catch this on the server, and continue posting other clients.
Howie
Your question is very similar to what I'm currently
researching. I've got the additional complication of
detecting when clients crash without unregistering (in
my case unlocking) a resource. I haven't written any
test code yet, so don't shoot me if I'm wrong, but
here is my general strategy.
In order to implementing RMI callbacks, it looks like
you must make both the clients and the server register
themselves in the RMI Registry. Parameters sent
through RMI method calls are done by value so
you can't simply add a listener as you normally do.
The server will put itself in the registry using a
well known ID. The clients will get this reference
and ask the server for a unique ID. They will then
register themselves in the RMI registry using this
value. The client will then tell the server that it
is registered. I believe if the client object is
wrapped in a WeakReference, then when the client dies
or ends, the reference contained in the WeakReference
will be null. The server will perform this check on
all registered clients to determine which clients are
still alive.
,Marcus

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