RFR: JDK-8313804: JDWP support for -Djava.net.preferIPv6Addresses=system [v7]

[Alex Menkov]

On Thu, 21 Sep 2023 00:49:45 GMT, Liam Miller-Cushon <cushon at openjdk.org> wrote:

>> Please consider this fix for [JDK-8313804](https://bugs.openjdk.org/browse/JDK-8313804), which adds support to JDWP for `-Djava.net.preferIPv6Addresses=system`. Previously it only handled `-Djava.net.preferIPv6Addresses=true` and `-Djava.net.preferIPv6Addresses=false`.
>
> Liam Miller-Cushon has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add more test cases

test/jdk/com/sun/jdi/JdwpNetProps.java line 133:

> 131:                     .run(TestResult.ListenFailed);
> 132:             new ListenTest("localhost", ipv6Address)
> 133:                     .run(TestResult.ListenFailed);

this is IPv6-only system and testcase tries to attach from IPv6 address. It should succeed.

test/jdk/com/sun/jdi/JdwpNetProps.java line 136:

> 134:             new ListenTest("localhost", ipv6Address)
> 135:                     .preferIPv6Addresses("system")
> 136:                     .run(systemPrefersIPv6 ? TestResult.Success : TestResult.AttachFailed);

this is IPv6-only system, so systemPrefersIPv6 cannot be false

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PR Review Comment: https://git.openjdk.org/jdk/pull/15796#discussion_r1333580132
PR Review Comment: https://git.openjdk.org/jdk/pull/15796#discussion_r1333581171