Charset issue

[Andrei Petru Mura]

I have AlmaLinux (CentOS follower) with jre 1.8.0. And Apache Karaf 4.0.4.
installed in this environment. Two almost identical servers.

If I run this Java code from terminal:
System.out.println(Charset.defaultCharset());

I get
US-ASCII.

If I run the same command from a karaf bundle, I get this on one server:

UTF-8

and on the second server, I get:

US-ASCII

My question would be: where does Apache Karaf load the default encoding
from? Or how does it set this?

N.B. Locale for both servers are identical: en_US.