8028074: InetAddress.getByName fails with UnknownHostException: invalid IPv6 address if host name starts with a-f

[Alan Bateman]

There's a small problem with the fix for JDK- 8019834 that was pushed to 
jdk8/tl today. The patch means that UHE is thrown when doing a lookup of 
hosts that start with a-f. I ran into it because I happen to be on a 
machine that starts with "a" :-)

I'd like to get a patch into jdk8/tl quickly so that others don't run 
into this. The proposed patch is attached.

-Alan

diff --git a/src/share/classes/java/net/InetAddress.java 
b/src/share/classes/java/net/InetAddress.java
--- a/src/share/classes/java/net/InetAddress.java
+++ b/src/share/classes/java/net/InetAddress.java
@@ -1144,7 +1144,7 @@
                         ifname = host.substring (pos+1);
                     }
                 }
-                if ((addr = IPAddressUtil.textToNumericFormatV6(host)) 
== null) {
+                if ((addr = IPAddressUtil.textToNumericFormatV6(host)) 
== null && host.contains(":")) {
                     throw new UnknownHostException(host + ": invalid 
IPv6 address");
                 }
             } else if (ipv6Expected) {