Considering the template below:

!!!
%html
  %head
    %title Some title
%body
  %p Some text in greek (Καλησπέρα)

I can't get the greek work right. As I can see from the generated source code the greek characters was escaped, so I used = "Some text in greek (Καλησπέρα)" instead and the generated scala file did have the right characters. Still in both situations I can't get the template get rendered right (the output html contains ? instead of greek characters).

I had similar problems with groovy and -Dfile.encoding=UTF-8 did solve the problem so I made sure this system property had UTF-8 as value.

public class FixedScalateTemplateFilter extends TemplateEngineFilter {
  @Override
  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) {
    response.setCharacterEncoding(request.getCharacterEncoding()); // Just fixed the character encoding!
    super.doFilter(request, response, chain);
  }
}