Problem in starting rmid in a port different than the default one

Question

hi all,
i am experiencing exceptions in running rmid in a port different than a default one.
if i run
rmiregistry 2000
rmid -J-Djava.security.policy=policy
java -Djava.security.policy=policy -Djava.rmi.server.codebase=<mypath> -classpath <myclasspath> com.myclass.ActivatableRMI <host:port>
everything works fine
but if i try to specify a port in which rmid should be started, then i have exceptions...
can anyone tell me how to solve my problem? i am running NT 4.0
thanx and regards
     marco

Answer 1

If you start rmid at port other than the default one
(1098) with -port option, it is necessary to set the
system property "java.rmi.activation.port" to this
port.
Rmid internally starts a local registry service
(LocateRegistry.createRegistry(port)) and binds the
RMI activation system server object with this registry
service like Naming.rebind("//:" + port +
"/java.rmi.activation.ActivationSystem",
activationSystem);. Activation system provides a means
for registering groups and "activatable" objects to be
activated within those groups. When a activatable
server object is exported, it is registered with this
activation system, so it should get the stub to the
activation system which is started as part of rmid.
ActivationGroup class provides a static function
getSystem() to get the reference to the activation
system stub. Now it makes use of the system property
"java.rmi.activation.port" value to contact the
registry service where activation system registered
itself under the name "//:" + value of
java.rmi.activation.port +
"/java.rmi.activation.ActivationSystem". If this
property is not set, it uses the default port 1098.
-- Srinath MandalapuThis is an awesome and lovely forum answer (and I saw srinath_babu reply to another similarly in my search), but I would like to ask for just a bit of clarification.
My question is simply making sure I understand the reply above in my own terms...
Suppose that right now my program involving activatables is already working with default port 1098, but that I wanted or needed to change to another port for rmid. Then is this statement true?
- IF the commandline which which I start rmid specifies port xyxyx,
- AND IF I added -Djava.rmi.activation.port=xyxyx to the commandline with which I run the setup for my Activatable (i.e. the program that calls Activatable.register method),
- THEN my code will still work as is (i.e. I wouldn't have to change my existing code to specify the port anywhere in it)?
(If I am not understanding this correctly, please let me know!)
Thanks very much,
/Mel