How to resolve java.security.AccessControlException

Question

I wrote a component for serverside(Remote interface,Remote Interface implementation class,stub,skel.. e.t.c) under RMI APIs,but when I m running the class in which i have implemented remote interface throw
a security exception java.security.AccessControlException:access denied<java.net.SocketPermission localhostDistributed resolved>.
can someone suggest me whether it is problem of My computer's security settings or there is some problem in java.policy file.Is there any other way to get rid of this problem.
I also need help to configure my policy file...
Thankyou....
Here below I m giving soure code of class (which is throwing exception and implements remote interface "DistributedEx")
import java.rmi.*;
import java.rmi.server.*;
public class DistributedExmpl extends UnicastRemoteObject implements
DistributedEx
     static String hostname="localhost";
     static String data[]={"First String"
                           "Second String"
                           "Third String"};
     public DistributedExmpl()throws RemoteException
          super();
     public int getDataNum()throws RemoteException
          return data.length;
     public String getData(int n)throws RemoteException
          return data[n%data.length];
     public static void main(String args[])
          System.setSecurityManager(new RMISecurityManager());
          try{
               DistributedExmpl instance =new DistributedExmpl();
               Naming.rebind("//"+hostname+"Distributed",instance);
               System.out.println("Regiterd Now");
          catch(Exception ex)
               System.out.println(ex);
     }

Answer 1

The program tried to resolve your "hostname" to an IP address using your machine's naming service. However it needs the "resolve" socket permission.
You can change your default socket permssion from
permission java.net.SocketPermission "localhost:1024-", "listen";to
permission java.net.SocketPermission "localhost:1024-", "listen,resolve";or you can just remove the following line if your RMI server doesn't download classes:
System.setSecurityManager(new RMISecurityManager());