FULL PRODUCT VERSION :
openjdk version "14-ea" 2020-03-17
OpenJDK Runtime Environment (build 14-ea+17-721)
OpenJDK 64-Bit Server VM (build 14-ea+17-721, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Windows Server 2016 Japanese

A DESCRIPTION OF THE PROBLEM :
Under Japanese Windows environments, Japanese name module cannot be handled.
Compiling and executing are OK, but referencing the module by javac with "--add-modules" option failed.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Extract the attached JapaneseNameTest.zip.
Only "moduel-info.java" in the zip file has Japanese string for module name.
The module name is "Hiragana letter A", U+3042, plus "_module".

Execute the following command under Japanese environment.
> javac -d mod1 -encoding utf-8 ABC.java module-info.java
> java -p mod1 --module あ_module/test.isel.ABC
ABC:main
ABC:method1
> javac -p mod1 --add-modules あ_module test0.java
error: module not found: あ_module
1 error
> java -p mod1 --describe-module あ_module
??_modu not found

REPRODUCIBILITY :
This bug can be reproduced always.

ADDITIONAL INFORMATION:
Linux environments don't have this problem, since it's UTF-8 encoding.