RMI Exceptions

Question

Hello, I am new to java RMI,
I have written a simple program, I can run Server without problems, but when I try to run Client I get these exceptions:
Exception in thread "main" java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.0.1:13371 connect,resolve)
     at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)
     at java.security.AccessController.checkPermission(AccessController.java:546)
     at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
     at java.lang.SecurityManager.checkConnect(SecurityManager.java:1034)
     at java.net.Socket.connect(Socket.java:519)
     at java.net.Socket.connect(Socket.java:475)
     at java.net.Socket.<init>(Socket.java:372)
     at java.net.Socket.<init>(Socket.java:186)
     at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:22)
     at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:128)
     at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:595)
     at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:198)
     at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:184)
     at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:322)
     at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
     at Client.<init>(Client.java:47)
     at Client.main(Client.java:104)Here is my "Communication" interface:
import java.rmi.*;
public interface Communication extends Remote{
     public void receiveUsername(String username) throws RemoteException;
     public void receivePassword(String password) throws RemoteException;
}Here is the part of my Server class:
System.setSecurityManager(new RMISecurityManager());
try {
     address_ = (InetAddress.getLocalHost()).toString();
} catch (UnknownHostException e) {
     e.printStackTrace();
     System.exit(1);
port_ = 13371;
try {
     registry_ = LocateRegistry.createRegistry(port_);
     registry_.rebind("MyServer", this);
} catch (RemoteException e) {
     e.printStackTrace();
     System.exit(1);
System.out.println("Server succesfully started...");
System.out.println("{Address = " + address_ + ", port = " + port_ + "}");
System.out.println("Waiting for tasks...");Here is the part of my Client class:
System.setSecurityManager(new RMISecurityManager());
System.out.println("Trying to connect to " + SERVER_ADDRESS + " via " + PORT);
try {
     registry_ = LocateRegistry.getRegistry(SERVER_ADDRESS, PORT);
     server_ = (Communication) (registry_.lookup("MyServer"));
} catch (RemoteException e) {
     e.printStackTrace();
     System.exit(1);
} catch (NotBoundException e) {
     e.printStackTrace();
     System.exit(1);
}This is how I compile and run my server:
javac Server.java
rmic Server
java Server
This is how I compile and run my client:
javac Client.java
java Client
Can somebody help me to find out what I am doing wrong, and what I need to fix this?
Thanks for any help, I appreciate it.

Answer 1

Alright so, I have specified externally reachable ip, and I got these exceptions on server:
Exception in thread "RMI TCP Connection(idle)" java.security.AccessControlException: access denied (java.net.SocketPermission xxx.xxx.xx.xx:49926 accept,resolve)
     at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)
     at java.security.AccessController.checkPermission(AccessController.java:546)
     at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
     at java.lang.SecurityManager.checkAccept(SecurityManager.java:1157)
     at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.checkAcceptPermission(TCPTransport.java:636)
     at sun.rmi.transport.tcp.TCPTransport.checkAcceptPermission(TCPTransport.java:275)
     at sun.rmi.transport.Transport$1.run(Transport.java:158)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
     at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
     at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
     at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
     at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
     at java.lang.Thread.run(Thread.java:619)
and exceptions on client side:
java.rmi.UnmarshalException: Error unmarshaling return header; nested exception is:
     java.io.EOFException
     at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:209)
     at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:359)
     at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
     at Client.<init>(Client.java:47)
     at Client.main(Client.java:104)
Caused by: java.io.EOFException
     at java.io.DataInputStream.readByte(DataInputStream.java:250)
     at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:195)
     ... 4 more