RMI Communication with Fixed port

Question

I am mentioning here what I have done
MyServer class
public class MyRMIServer {
     public static void main(String[] args) {
                    try{
               System.setSecurityManager(new RMISecurityManager());
               MyRMIServiceInterface myRMIServiceInterface = (MyRMIServiceInterface)UnicastRemoteObject.exportObject(new MyRMIServiceImpl(), 50000);
               Registry registry = LocateRegistry.createRegistry(1099);
               registry.bind("myRMIImplInstance", myRMIServiceInterface);
          catch (Exception e) {
               e.printStackTrace();
My client class
public class MyRMIClient {
     public static void main(String[] args) {
          try{
               Registry registry = LocateRegistry.getRegistry("localhost", 1099);
               MyRMIServiceInterface myRMIServiceInterface = (MyRMIServiceInterface)registry.lookup("myRMIImplInstance");
               myRMIServiceInterface.getDate();
          catch (Exception e) {
               e.printStackTrace();
My rmi.policy
permission java.net.SocketPermission "localhost:1099", "connect, resolve";     
     permission java.net.SocketPermission "localhost:50000", "connect, resolve";
     permission java.net.SocketPermission "localhost:50000", "accept, resolve";
I run this program and getting exception at server side
Exception in thread "RMI TCP Connection(idle)" java.security.AccessControlExcept
ion: access denied (java.net.SocketPermission 127.0.0.1:49642 accept,resolve)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkAccept(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.checkAcceptPermi
ssion(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport.checkAcceptPermission(Unknown Sour
ce)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Sou
rce)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Sour
ce)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
and the 49642 is random
Please clear my concept. Is it possible to make this communication to 50000.
Edited by: Basir.Ahmed on Feb 14, 2010 7:01 PM
Edited by: Basir.Ahmed on Feb 14, 2010 7:02 PM

Answer 1

So Could you tell me why this permission level is not workingCertainly. I wrote:
you have to define SocketPermissions at the server that permit it to accept from any client port numberYou implemented:
permission java.net.SocketPermission "localhost:50000", "accept, resolve";So you haven't done what I said.
Why I got the above exception. That's why.
Is this case of local machine only? You've specified that you will only accept connections from 'localhost' on port 50000. I've already told you that the port number is too restrictive, you have to allow any ports, say 1024-. If 'localhost' is too restrictive, change that too, but I don't know what your requirement is (or why you are still using a SecurityManager at all).
For above test does not relate the firewall like configuration?I don't understand that.