Exception com RMI

Front-end
#1

tô tentando fazer o tutorial da sun para rmi…
http://java.sun.com/docs/books/tutorial/rmi/overview.html

mas quando executo o

package engine;

import java.rmi.*;
import java.rmi.server.*;
import compute.*;

public class ComputeEngine extends UnicastRemoteObject
                           implements Compute
{
    public ComputeEngine() throws RemoteException {
        super();
    }

    public Object executeTask(Task t) {
        return t.execute();
    }

    public static void main(String[] args) {
        if (System.getSecurityManager() == null) {
            System.setSecurityManager(new RMISecurityManager());
        }
        String name = "//host/Compute";
        try {
            Compute engine = new ComputeEngine();
            Naming.rebind(name, engine);
            System.out.println("ComputeEngine bound");
        } catch (Exception e) {
            System.err.println("ComputeEngine exception: " + e.getMessage());
            e.printStackTrace();
        }
    }
}

tomo a seguinte exception …

ComputeEngine exception: access denied (java.net.SocketPermission host resolve)
java.security.AccessControlException: access denied (java.net.SocketPermission host 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.checkConnect(Unknown Source)
	at java.net.InetAddress.getAllByName0(Unknown Source)
	at java.net.InetAddress.getAllByName0(Unknown Source)
	at java.net.InetAddress.getAllByName(Unknown Source)
	at java.net.InetAddress.getByName(Unknown Source)
	at java.net.InetSocketAddress.<init>(Unknown Source)
	at java.net.Socket.<init>(Unknown Source)
	at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(Unknown Source)
	at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(Unknown Source)
	at sun.rmi.transport.tcp.TCPEndpoint.newSocket(Unknown Source)
	at sun.rmi.transport.tcp.TCPChannel.createConnection(Unknown Source)
	at sun.rmi.transport.tcp.TCPChannel.newConnection(Unknown Source)
	at sun.rmi.server.UnicastRef.newCall(Unknown Source)
	at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
	at java.rmi.Naming.rebind(Unknown Source)
	at engine.ComputeEngine.main(ComputeEngine.java:23)
#2

No momento que vc usa:


if (System.getSecurityManager() == null) {
             System.setSecurityManager(new RMISecurityManager());
         }

Como esta escrito seu arquivo policy , com as permissoes ? , se vc nao possui o arquivo policy nao precisa usar o metodo System.getSecurityManager()

#3

meu java.policy


// Standard extensions get all permissions by default

grant codeBase "file:${{java.ext.dirs}}/*" {
	permission java.security.AllPermission;
};

// default permissions granted to all domains

grant { 
	// Allows any thread to stop itself using the java.lang.Thread.stop()
	// method that takes no argument.
	// Note that this permission is granted by default only to remain
	// backwards compatible.
	// It is strongly recommended that you either remove this permission
	// from this policy file or further restrict it to code sources
	// that you specify, because Thread.stop() is potentially unsafe.
	// See "http://java.sun.com/notes" for more information.
	permission java.lang.RuntimePermission "stopThread";

	// allows anyone to listen on un-privileged ports
	permission java.net.SocketPermission "localhost:1024-", "listen,connect,accept";

	// "standard" properies that can be read by anyone

	permission java.util.PropertyPermission "java.version", "read";
	permission java.util.PropertyPermission "java.vendor", "read";
	permission java.util.PropertyPermission "java.vendor.url", "read";
	permission java.util.PropertyPermission "java.class.version", "read";
	permission java.util.PropertyPermission "os.name", "read";
	permission java.util.PropertyPermission "os.version", "read";
	permission java.util.PropertyPermission "os.arch", "read";
	permission java.util.PropertyPermission "file.separator", "read";
	permission java.util.PropertyPermission "path.separator", "read";
	permission java.util.PropertyPermission "line.separator", "read";

	permission java.util.PropertyPermission "java.specification.version", "read";
	permission java.util.PropertyPermission "java.specification.vendor", "read";
	permission java.util.PropertyPermission "java.specification.name", "read";

	permission java.util.PropertyPermission "java.vm.specification.version", "read";
	permission java.util.PropertyPermission "java.vm.specification.vendor", "read";
	permission java.util.PropertyPermission "java.vm.specification.name", "read";
	permission java.util.PropertyPermission "java.vm.version", "read";
	permission java.util.PropertyPermission "java.vm.vendor", "read";
	permission java.util.PropertyPermission "java.vm.name", "read";
};
#4