Name: jl125535 Date: 03/30/2004


FULL PRODUCT VERSION :
java version "1.4.2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-b28)
Java HotSpot(TM) Client VM (build 1.4.2-b28, mixed mode)

java version "1.5.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b32c)
Java HotSpot(TM) Server VM (build 1.5.0-beta-b32c, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
SunOS AS101 5.8 Generic_108528-23 sun4u sparc SUNW,Netra-T4


A DESCRIPTION OF THE PROBLEM :
JDK 1.4.2 and JDK 1.4.1_03 do not correctly cache hostnames with uppercase characters. The following driver illustrates the problem. Running snoop when running the program shows that it is doing a DNS lookup for every lookup for www.SUN.com but not for www.sun.com

Looks like this was broken in fixing Bug 4692867.

I decompiled the code for java.net.InetAddress in rt.jar and can see how it is converting to lower case when reading the cache but not when writing to it.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. compile the attached java code.

2. Start up snoop to DNS server

3. Run program

/usr/local/java/1.4.2/bin/java -Dsun.net.inetaddr.ttl=600 DnsTest

4. Snoop output will show 50 lookups for www.SUN.com and one for www.sun.com


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
a single lookup for www.SUN.com

ACTUAL -
www.SUN.com lookup is never cached!

ERROR MESSAGES/STACK TRACES THAT OCCUR :
snoop output from test on my system:

# snoop 192.168.200.58
Using device /dev/eri (promiscuous mode)
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.SUN.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.SUN.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C www.sun.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R www.sun.com. Internet Addr 64.124.140.199
       AS101 -> maildns.loadtest.broadsoft.com DNS C 58.200.168.192.in-addr.arpa. Internet PTR ?
maildns.loadtest.broadsoft.com -> AS101 DNS R 58.200.168.192.in-addr.arpa. Internet PTR maildns.loadtest.broadsoft.com.
       AS101 -> maildns.loadtest.broadsoft.com DNS C maildns.loadtest.broadsoft.com. Internet Addr ?
maildns.loadtest.broadsoft.com -> AS101 DNS R maildns.loadtest.broadsoft.com. Internet Addr 192.168.200.58




REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.net.*;

public class DnsTest {

  public static void main(String[] args) {

        try {

          System.out.println ("TTL"
                              + System.getProperty("sun.net.inetaddr.ttl"));
          for (int i = 0 ; i < 50 ; i++ ) {
                InetAddress [] addrs = InetAddress.getAllByName ("www.SUN.com");
          }

          for (int j = 0 ; j < 50 ; j++ ) {
                InetAddress [] addrs = InetAddress.getAllByName ("www.sun.com");
          }


        } catch (Exception e) {
                System.out.println (e);
                e.printStackTrace ();
        }
  }
}

---------- END SOURCE ----------
(Incident Review ID: 240525)
======================================================================