使用的Rmi服务器端口alrady

Question

I want to run simple rmi server code below. Firstly, I write command "rmiregistry 9260" and so I started the rmi register. Then I run following code but I get errors. What can cause these errors? Note that I tried different port numbers.

public class Server {

    public static void main(String args[]) {

        try {
            PaymentImpl robj = new PaymentImpl();
            Payment stub = (Payment) UnicastRemoteObject.exportObject(robj, 9260);

            Registry registry = LocateRegistry.getRegistry();
            registry.bind("Mortgage", stub);
            System.out.println("Mortgage Server is ready to listen... ");

        } catch (Exception e) {
            System.err.println("Server exception thrown: " + e.toString());
            e.printStackTrace();
        }
    }
}


Server exception thrown: java.rmi.server.ExportException: Port already in use
260; nested exception is:
        java.net.BindException: Address already in use
java.rmi.server.ExportException: Port already in use: 9260; nested exception

        java.net.BindException: Address already in use
        at sun.rmi.transport.tcp.TCPTransport.listen(Unknown Source)
        at sun.rmi.transport.tcp.TCPTransport.exportObject(Unknown Source)
        at sun.rmi.transport.tcp.TCPEndpoint.exportObject(Unknown Source)
        at sun.rmi.transport.LiveRef.exportObject(Unknown Source)
        at sun.rmi.server.UnicastServerRef.exportObject(Unknown Source)
        at java.rmi.server.UnicastRemoteObject.exportObject(Unknown Source)
        at java.rmi.server.UnicastRemoteObject.exportObject(Unknown Source)
        at Server.main(Server.java:14)
Caused by: java.net.BindException: Address already in use
        at java.net.PlainSocketImpl.socketBind(Native Method)
        at java.net.AbstractPlainSocketImpl.bind(Unknown Source)
        at java.net.ServerSocket.bind(Unknown Source)
        at java.net.ServerSocket.<init>(Unknown Source)
        at java.net.ServerSocket.<init>(Unknown Source)
        at sun.rmi.transport.proxy.RMIDirectSocketFactory.createServerSocket(
nown Source)
        at sun.rmi.transport.proxy.RMIMasterSocketFactory.createServerSocket(
nown Source)
        at sun.rmi.transport.tcp.TCPEndpoint.newServerSocket(Unknown Source)
        ... 8 more

Answer 1

If you're using 9260 for a separate Registry process you can't use it again in this process. You can use 9260 for both by starting the Registry in this process, with LocateRegistry.createRegistry(). Store the return value into a static variable to prevent GC.