Include logger silence from active support

src/main/ruby/jruby/rack/rails/rails_logger.rb

@@ -0,0 +1,15 @@
+require 'active_support/logger_silence'
+
+module JRuby
+  module Rack
+    class RailsLogger < JRuby::Rack::Logger
+      include ActiveSupport::LoggerSilence
+
+      def info(*args)
+        return unless info?
+
+        super(*args)
+      end
+    end
+  end
+end

src/main/ruby/jruby/rack/rails/railtie.rb

@@ -8,6 +8,7 @@
 
 require 'rails/railtie'
 require 'pathname'
+require 'jruby/rack/rails/rails_logger'
 
 module JRuby::Rack
   class Railtie < ::Rails::Railtie
@@ -37,7 +38,9 @@ class Railtie < ::Rails::Railtie
 
     initializer 'set_servlet_logger', :before => :initialize_logger do |app|
       app.config.logger ||= begin
-        config = app.config; logger = JRuby::Rack.logger
+        config = app.config
+        logger = RailsLogger.new
+        JRuby::Rack.logger = logger
         log_level = config.log_level || :info
         logger.level = logger.class.const_get(log_level.to_s.upcase)
         log_formatter = config.log_formatter if config.respond_to?(:log_formatter) # >= 4.0