java.net.preferIPv4Stack=true warning not possible to disable on OpenBSD #5057
Description
Environment
JRuby version: jruby 9.1.16.0 (2.3.3) 2018-02-21 8f3f95a OpenJDK 64-Bit Server VM 25.144-b01 on 1.8.0_144-b01 +jit [OpenBSD-x86_64]
Operating system: OpenBSD/amd64 6.2-current
Expected Behavior
$ jruby -r socket -e 'p 1'
1
Actual Behavior
$ jruby -r socket -e 'p 1'
2018-02-21T13:52:40.076-08:00 [main] WARN Ruby : Warning: not setting network stack system property because socket subsystem may already be booted.If you need this option please set it manually as a JVM property.
Use JAVA_OPTS=-Djava.net.preferIPv4Stack=true OR prepend -J as a JRuby option.
1
Let's say I try to take the advice it gives:
$ jruby -J-Djava.net.preferIPv4Stack=true -r socket -e 'p 1'
2018-02-21T13:52:40.076-08:00 [main] WARN Ruby : Warning: not setting network stack system property because socket subsystem may already be booted.If you need this option please set it manually as a JVM property.
Use JAVA_OPTS=-Djava.net.preferIPv4Stack=true OR prepend -J as a JRuby option.
1
$ JAVA_OPTS=-Djava.net.preferIPv4Stack=true jruby -r socket -e 'p 1'
2018-02-21T13:52:40.076-08:00 [main] WARN Ruby : Warning: not setting network stack system property because socket subsystem may already be booted.If you need this option please set it manually as a JVM property.
Use JAVA_OPTS=-Djava.net.preferIPv4Stack=true OR prepend -J as a JRuby option.
1
Well that sucks. I can only get the warning to be suppressed if I use a setting of false instead of true:
testcurrent$ jruby -J-Djava.net.preferIPv4Stack=false -r socket -e 'p 1'
1
testcurrent$ JAVA_OPTS=-Djava.net.preferIPv4Stack=false jruby -r socket -e 'p 1'
1
However, that changes the behavior, since the OpenBSD OpenJDK default is true (see https://github.com/openbsd/ports/blob/master/devel/jdk/1.8/patches/patch-jdk_src_solaris_native_java_lang_java_props_md_c#L8-L10).
I believe this behavior broke in d55cd48, which was an attempt to fix #4869. Since I'm guessing you don't want to revert that, is there a way JRuby can be fixed so that it doesn't warn if the JDK defaults java.net.preferIPv4Stack to true?