On Tue, 16 Dec 2025 15:18:11 GMT, Matthias Baesken <[email protected]> wrote:
> In [JDK-8373676](https://bugs.openjdk.org/browse/JDK-8373676) > we noticed a "SocketException: Protocol family unavailable" because of > missing ipv6 support. We could improve this exception and tell that the ipv6 > support is not available or something related. src/java.base/unix/native/libnet/net_util_md.c line 285: > 283: jint address; > 284: if (family != java_net_InetAddress_IPv4) { > 285: JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", > "Protocol family ipv6, but ipv6 on machine unavailable"); Hello Matthias, just a drive-by comment. I haven't yet paid close attention to this proposal. If we are going to change this message, then perhaps just change it to `IPv6 protocol family unavailable`. Looking at the implementation of `ipv6_available()`, for it to return `false` and thus to throw this exception, either IPv6 isn't supported on that host or the `-Djava.net.preferIPv4Stack=true` system property is set. So I think it's better to leave out the IPv6 not available on machine part. ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/28851#discussion_r2631466333
