How do I create and edit files with multibyte characters file name on JBoss EAP for OpenShift?

Issue

• How do I create and edit files with multibyte characters file name on JBoss EAP for OpenShift?
• How do I set ja_JP.UTF-8 as the system locale in JBoss EAP for OpenShift?
• Getting the following error when I create Japanese file name/opt/eap/日本語ファイル名.txt：

8:59:32,756 ERROR [io.undertow.request] (default task-1) UT005023: Exception handling request to /test-app/api/files: org.jboss.resteasy.spi.UnhandledException: java.nio.file.InvalidPathException: Malformed input or input contains unmappable characters: /opt/eap/???????.txt
    ...
Caused by: java.nio.file.InvalidPathException: Malformed input or input contains unmappable characters: /opt/eap/???????.txt
    at sun.nio.fs.UnixPath.encode(UnixPath.java:147)
    at sun.nio.fs.UnixPath.<init>(UnixPath.java:71)
    at sun.nio.fs.UnixFileSystem.getPath(UnixFileSystem.java:281)
    at java.nio.file.Paths.get(Paths.java:84)
    at com.redhat.cee.example.jafile.FileResource.createNewJaFile(FileResource.java:19)
    ...