javac doesn't work in some locales, including ja, ko, zh_TW, etc. The error is:

% uname
SunOS
% env LANG=ja /usr/local/java/jdk1.4/solsparc/bin/javac -verison
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/tools/javac/Main
% env LANG=ko /usr/local/java/jdk1.4/solsparc/bin/javac -verison
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/tools/javac/Main

% uname
Linux
% env LANG=ja /usr/local/java/jdk1.4/linux-i386/bin/javac -version
javac: invalid flag: -version
Usage: javac <options> <source files>
where possible options include:
  -g Generate all debugging info
  -g:none Generate no debugging info
  -g:{lines,vars,source} Generate only some debugging info
  -O Optimize; may hinder debugging or enlarge class file
  -nowarn Generate no warnings
  -verbose Output messages about what the compiler is doing
  -deprecation Output source locations where deprecated APIs are used
  -classpath <path> Specify where to find user class files
  -sourcepath <path> Specify where to find input source files
  -bootclasspath <path> Override location of bootstrap class files
  -extdirs <dirs> Override location of installed extensions
  -d <directory> Specify where to place generated class files
  -encoding <encoding> Specify character encoding used by source files
  -source <release> Provide source compatibility with specified release
  -target <release> Generate class files for specific VM version
  -help Print a synopsis of standard options

% env LANG=ja_JP.eucJP /usr/local/java/jdk1.4/linux-i386/bin/javac -version
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/tools/javac/Main

It doesn't work on Windows 2000 with setting ja locale.

See Comments for more information.