added support for JRuby via jgeo-ip gem

lib/geocoder/lookups/maxmind_local.rb

@@ -5,12 +5,19 @@ module Geocoder::Lookup
   class MaxmindLocal < Base
 
     def initialize
+      if RUBY_PLATFORM == "java"
+        begin
+          require 'jgeoip'
+        rescue LoadError => e
+          raise 'Could not load geoip dependency. To use MaxMind Local lookup you must add geoip gem to your Gemfile or have it installed in your system.'
+        end
+      else
         begin
           require 'geoip'
         rescue LoadError => e
           raise 'Could not load geoip dependency. To use MaxMind Local lookup you must add geoip gem to your Gemfile or have it installed in your system.'
         end
-
+      end
       super
     end
 
@@ -32,8 +39,11 @@ module Geocoder::Lookup
           "Geocoder.configure(:maxmind_local => {:database => ...}), "
         )
       end
-      
+      if RUBY_PLATFORM == "java"
+        result = JGeoIP.new(configuration[:database]).city(query.to_s)
+      else
         result = GeoIP.new(configuration[:database]).city(query.to_s)
+      end
       
       result.nil? ? [] : [result.to_hash]
     end