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From "Svetlana Samoilenko (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-56) java.net.InetAddress.getAllByName(null) throws UnknownHostException instead of valid InetAddress
Date Tue, 31 Jan 2006 11:22:32 GMT
java.net.InetAddress.getAllByName(null) throws UnknownHostException instead of valid InetAddress
------------------------------------------------------------------------------------------------

         Key: HARMONY-56
         URL: http://issues.apache.org/jira/browse/HARMONY-56
     Project: Harmony
        Type: Bug
  Components: Classlib  
    Reporter: Svetlana Samoilenko


According to j2se 1.4.2 specification java.net.InetAddress.getAllByName(String host) method
allows a host is null. In this case the  InetAddress representing an address of the loopback
interface is returned.
But as we can see from the test listed below java.net.InetAddress.getAllByName(null) throws
UnknownHostException instead of valid InetAddress.

Code to reproduce: 
import java.net.*;
public class test2 {
    public static void main (String[] args) {
 
        try {
           InetAddress[] ia = InetAddress.getAllByName(null); 
           for (int i = 0; i<ia.length; i++) {
               System.out.println("***InetAddress.getAllByName(null)["+i+"] returned " + ia[i]);

           }
        } catch (Exception e) {
            System.out.println("***Unexpected exception:" + e); 
       }
    } 
}

Steps to Reproduce: 
1. Build Harmony (check-out on 2006-01-30) j2se subset as described in README.txt. 
2. Compile test2.java using BEA 1.4 javac 
> javac -d . test2.java 
3. Run java using compatible VM (J9) 
> java -showversion test2 

Output: 
C:\tmp>C:\jrockit-j2sdk1.4.2_04\bin\java.exe -showversion test2 
java version "1.4.2_04" 
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_04-b05) 
BEA WebLogic JRockit(TM) 1.4.2_04 JVM (build ari-31788-20040616-1132-win-ia32, Native Threads,
GC strategy: parallel) 
***InetAddress.getAllByName(null)[0] returned localhost/127.0.0.1

C:\tmp>C:\harmony\trunk\deploy\jre\bin\java -showversion test2 
(c) Copyright 1991, 2005 The Apache Software Foundation or its licensors, as applicable.
***Unexpected exception:java.net.UnknownHostException: No host name provided

Suggested junit test case:
------------------------ InetAddressTest.java -------------------------------------------------

import java.net.*; 
import junit.framework.*; 

public class InetAddressTest extends TestCase { 
    public static void main(String[] args) { 
        junit.textui.TestRunner.run(InetAddressTest.class); 
    } 

    public void test_getAllByName() { 
        try {
           InetAddress[] ia = InetAddress.getAllByName(null); 
           assertEquals ("Assert 0: getAllByName() returns incorrect value " + ia[0].toString(),"localhost/127.0.0.1",ia[0].toString());

        } catch (Exception e) {            
           fail("Assert 1: Unexpected exception:" + e);
        }
    } 
}


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