Multibyte characters are garbled

When I compile a Java code with multibyte characters using javac command, failed compile.

Java Source Code

public class Test {
  public static void main(String[] args) {
   System.out.println("↓");
  }
}

Procedures

docker run -v $(pwd):/work -it -w /work \
  ghcr.io/graalvm/graalvm-ce:22.0.0.2 bash

bash-4.4# javac Test.java
Test.java:3: error: unmappable character (0xE2) for encoding US-ASCII
   System.out.println("???");
                       ^
Test.java:3: error: unmappable character (0x86) for encoding US-ASCII
   System.out.println("???");
                        ^
Test.java:3: error: unmappable character (0x93) for encoding US-ASCII
   System.out.println("???");
                         ^
bash-4.4#

Solution for this behavior

I've fixed to change environment variable value of LANG to C.utf8 from en_US.UTF-8.

docker run -v $(pwd):/work -it -w /work \
  -e LANG=C.utf8 \
  ghcr.io/graalvm/graalvm-ce:22.0.0.2 bash

It's working fine.

bash-4.4# javac Test.java
bash-4.4# java Test
↓
bash-4.4#

Proposal

I will propose to change default LANG value to C.utf8 from en_US.UTF-8.

p.s:

The en_US.UTF-8 not installed on container by default.

bash-4.4# locale -a
C
C.utf8
POSIX
bash-4.4#

Start by reproducing the issue with the provided Docker command, the Java source, and javac, then inspect the container image definition for its default LANG value. Check locale -a inside the image and verify that the proposed setting allows the source to compile and run without garbled characters.