[Bug 239890] java/openjdk11: openjdk 11.0.4+11.2 JDBC connections fail with IPv6 addresses

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239890

--- Comment #11 from antonfb@hesiod.org ---
I've notice this failure started when I upgraded to 14.1 from 13.2.
I've also noticed some issues, not clear they are the same when going from 13.2
to 13.3.
I looked at the kernel tcp code and I believe it started enforcing that you can
not used 4 in 6 addresses for connect when v6only is 1. I think 13.2 didn't
enforce that for connect when it did for bind.
Things with java seem to work with preferipv4stack=false AND sysctl ipv6only=0,
but other utilities on the system have problems with that.
My use of tomcat is a problem here. Needing ipv6 support and jdbc together seem
to require this combination.
I do think, and I may try to debug, that jdk should be setting a new socket's
v6only option to v6only=0 when the ip stack being used is ipv6.
I wonder if running jdk in a jail where that jail sets the sysctl v6only to 0
might solve the issue for me. But having to look at this for every os upgrade
is bad.

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