InetAddress.getAllByName() and InetAddress.getByName() fails

InetAddress.getAllByname() fails when its been called
InetAddress.getAllByName(InetAddress.getHostName()) and host name is an IP address Solaris 8 machine.

InetAddress.getByName() also fails when its called in the same way.

How to reproduce this:

The following code is throwing exception at
   " InetAddress[] iadrtest = InetAddress.getAllByName(iadr[i].getHostName()); "
   
   statement when I executed this script as
   
   % java GetIP ff15::1234:1234:1234:1234
   
   
   Exception Message:
        exp mesg [ff15::1234:1234:1234:1234]
   
import java.net.*;
import java.io.*;

public class GetIP {


   public static void main(String[] arg)
   {
       try {
         InetAddress[] iadr = InetAddress.getAllByName(arg[0]);
        System.out.println("iadr length " + iadr.length);

         for(int i=0; i< iadr.length; i++)
         {
          System.out.println("ip address : " + iadr[i].getHostAddress());
          System.out.println(" Host Name :" + iadr[i].getHostName());
          //System.out.println("family " + iadr[i].getFamily());
          System.out.println("Host aadd byte arr " + iadr[i].getAddress());
          if(iadr[i] instanceof Inet4Address)
                System.out.println("v4 address");
          if(iadr[i] instanceof Inet6Address)
                System.out.println("v6 address ");

          if(!iadr[i].isMCOrgLocal()) {
              System.out.println("NOt org local scope");
           }
          InetAddress[] iadrtest = InetAddress.getAllByName(iadr[i].getHostName());
          System.out.println("working....");
         }
        InetAddress iad = InetAddress.getByName(arg[0]);
        System.out.println("ip of that host : " + iad.getHostAddress());
        System.out.println("inet add tostring : " + iad);
      } catch(Exception exp) {
         System.out.println("exp mesg " + exp.getMessage());
      }
   } // End of main

}