UnicastRemoteObject.export() does not throw SecurityException in Linux build if
the SecurityManager does not grant listen permission to the specified port.
See the following program:

import java.rmi.*;
import java.rmi.server.*;
import java.security.Permission;
import java.security.Permissions;
import java.net.SocketPermission;
import java.util.Enumeration;

public class UnicastTest {
    public static void main(String[] args) {
        Permissions perm = new Permissions();
        perm.add(new SocketPermission("127.0.0.1:3000", "listen"));
        System.setSecurityManager(new NoPermissionSM(perm));
         try {
              ExportImpl2 obj = new ExportImpl2();
              UnicastRemoteObject.exportObject(obj, 3000);
              System.out.println("SecurityException expected");
          } catch (SecurityException e) {
              System.out.println("OKAY");
          } catch (RemoteException e) {
               e.printStackTrace();
          }
      }
          
}

interface ExceptionRemote extends Remote {
}


class ExportImpl2 implements ExceptionRemote {
}

class NoPermissionSM extends SecurityManager {
    Permissions perms;
    /**
     * Construct a SecurityManager that will forbid all permissions
     * specified in perms.
     */
    public NoPermissionSM(Permissions perms) {
        this.perms = perms;
    }
    
    /**
     * Construct a SecurityManager that will not forbid any
     * permission.
     */
    public NoPermissionSM() {
        this.perms = new Permissions();
    }

    /**
     * Forbids actions which are specified in the constructor.
     * @param p checked permission
     */
    public void checkPermission(Permission p) {
        for (Enumeration enum = perms.elements(); enum.hasMoreElements();) {
            Permission curPerm = (Permission) enum.nextElement();
            if (curPerm.implies(p)) {
                throw new SecurityException();
            }
        }
    }
    
    /**
     * Forbids actions which are specified in the constructor.
     * @param p checked permission
     */
    public void checkPermission(Permission p, Object context) {

        for (Enumeration enum = perms.elements(); enum.hasMoreElements();) {
            Permission curPerm = (Permission) enum.nextElement();
            if (curPerm.implies(p)) {
                throw new SecurityException();
            }
        }
    }
}

The output in latest Linux build is:

$ /java/re/j2se/1.5.0/promoted/latest/binaries/linux-i586/bin/java -classpath . UnicastTest
SecurityException expected

The output in latest Solaris build is:

$ /java/re/j2se/1.5/promoted/latest/binaries/solaris-sparc/bin/java -classpath . UnicastTest
OKAY
###@###.### 10/12/04 21:24 GMT