required for doing early flush on JRuby under Tomcat

rack_patch.rb

class JRuby::Rack::Response
  def write_body(response)
      stream = response.getOutputStream
      begin
        @body.each do |el|
          stream.write(el.to_java_bytes)
          stream.flush
        end
      rescue LocalJumpError => e
        # HACK: deal with objects that don't comply with Rack specification
        @body = [@body.to_s]
        retry
      ensure
        @body.close if @body.respond_to?(:close)
      end
    end
end