All KieResources methods have an overloaded method with a String encoding parameter, for example:
  Resource newInputStreamResource(InputStream in);
  Resource newInputStreamResource(InputStreamin, String encoding);

Except for:
  Resource newFileSystemResource(File file);

Requirements: Add a method:
  Resource newFileSystemResource(File file, String encoding);


If no encoding is specified, the encoding defaults to the platform default (windows-1252 on windows, UTF-8 on linux). This causes portability issues: a DRL file that works perfectly on the developers machine might not work on the production machine - if they use different operation systems.