Run java application without starting rmiregistry

Question

When I'm running a client-server application that use Java RMI, I noticed that it still seems to work even though if I didn't start "rmiregistry" in the command prompt that I was learnt to do. The diffrence in the program I noticed:

    try { 
        LocateRegistry.getRegistry(1099).list();
        System.out.println("rmiregistry WAS started before running the application"); } 
    catch (RemoteException e) {
        LocateRegistry.createRegistry(1099);
        System.out.println("rmiregistry WAS NOT started before running the application"); }

Anyone with the knowledge could sort out what's happening and how it effect the program?

As one can do it in code, a command-line start is not needed. In general never use a command line prompt. — Joop Eggen, Dec 02 '13 at 20:27
So do you mean that "LocateRegistry.createRegistry(1099);" starts the rmiregistry if it's not already running? — Cander, Dec 02 '13 at 21:16

user207421 · Accepted Answer · 2013-12-02T23:30:35.540

LocateRegistry.getRegistry(1099).list();
System.out.println("rmiregistry WAS started before running the application"); }

That message is misleading. getRegistry() doesn't perform any network communication, so the fact that it succeeded isn't a valid indication that the Registry is running. Only using the result of getRegistry() can tell you that.

You're doing this back to front. You must try the createRegistry() call first, and if that fails do the getRegistry() call.createRegistry()` will fail if the Registry is already running, and succeed if it isn't.

Run java application without starting rmiregistry

1 Answers1