RFR: 8361423: Add IPSupport::printPlatformSupport to java/net/NetworkInterface/IPv4Only.java

[Jaikiran Pai]

On Fri, 11 Jul 2025 13:39:33 GMT, ayush <duke at openjdk.org> wrote:

> This is part of a series of diagnostic output updates to java.net tests to assist in the analysis of failures in IPv6 only environments
> for Linux there is not IPv4 configuration but the IPv4 stack remains enabled
> For macOS, and windows the IPv4 stacks are disabled, and IPv4 configuration removed
> 
> add IPSupport::printPlatformSupport(System.out);
> 
> to the start of main

This test-only change to add a diagnostic log looks fine to me. Before integrating, please run this test in our CI, with your changes to make sure it continues to work as expected.

test/jdk/java/net/NetworkInterface/IPv4Only.java line 52:

> 50:                 while (addrs.hasMoreElements()) {
> 51:                    InetAddress hostAddr = addrs.nextElement();
> 52:                    if ( hostAddr instanceof Inet6Address){

Hello Ayush, while you are changing this, you can additionally format that line as follows:

if (hostAddr instanceof Inet6Address) {

-------------

Marked as reviewed by jpai (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26265#pullrequestreview-3028609324
PR Review Comment: https://git.openjdk.org/jdk/pull/26265#discussion_r2212761988