Description of problem:

The documentation says, "To set the locale at a system wide level, the file /etc/locale.conf need to be modified." [1]

Version-Release number of selected component (if applicable):

How reproducible:

1. podman run -ti registry.redhat.io/openjdk/openjdk-11-rhel7:latest bash
   [jboss@7bcee20dc1de ~]$ locale
   LANG=
   LC_CTYPE="POSIX"
   LC_NUMERIC="POSIX"
   LC_TIME="POSIX"
   LC_COLLATE="POSIX"
   LC_MONETARY="POSIX"
   LC_MESSAGES="POSIX"
   LC_PAPER="POSIX"
   LC_NAME="POSIX"
   LC_ADDRESS="POSIX"
   LC_TELEPHONE="POSIX"
   LC_MEASUREMENT="POSIX"
   LC_IDENTIFICATION="POSIX"
   LC_ALL=
   [jboss@7bcee20dc1de ~]$ cat /etc/locale.conf
   LANG="en_US.UTF-8"

Actual results:

current locale is POSIX

Expected results:

current locale is en_US.UTF-8

Additional info:

If confirmed, this is rather serious. For instance switching from en_US.UTF-8 to POSIX locale means that all Java properties files will be read with ANSI_X3.4-1968 encoding instead of UTF-8. So Java 9 and later applications that relied on properties being in UTF-8 by default will break in subtle ways.

[1] https://access.redhat.com/solutions/974273#comment-2353309:~:text=etc/locale.conf.-,To%20set%20the%20locale%20at%20a%20system%20wide%20level%2C%20the%20file%20/etc/locale.conf%20need%20to%20be%20modified.,-To%20set%20the