diff --git a/judge/scripts/lib/configuration.rb b/judge/scripts/lib/configuration.rb
deleted file mode 100644
--- a/judge/scripts/lib/configuration.rb
+++ /dev/null
@@ -1,84 +0,0 @@
-module Grader
-
-  # This singleton class holds basic configurations for grader.  When
-  # running in each mode, grader uses resources from different
-  # directories and outputs differently.  Usually the attributes name
-  # are descriptive; below we explain more on each attributes.
-  class Configuration
-    # Rails' environment: "development", "production"
-    attr_accessor :rails_env
-
-    # Grader looks for problem [prob] in problem_dir/[prob], and store
-    # execution results for submission [x] of user [u] in directory
-    # user_result_dir/[u]/[x]
-    attr_accessor :problems_dir
-    attr_accessor :user_result_dir
-
-    # If report_grader=true, the grader would add a row in model
-    # GraderProcess.  It would report itself with grader_hostname and
-    # process id.
-    attr_accessor :report_grader
-    attr_accessor :grader_hostname    
-
-    # If talkative=true, grader would report status to console.  If
-    # logging=true, grader would report status to a log file located
-    # in log_dir, in a file name mode.options.pid.  TODO: defined
-    # log file naming.
-    attr_accessor :talkative
-    attr_accessor :logging
-    attr_accessor :log_dir
-
-    # These are directories related to the test interface.
-    attr_accessor :test_request_input_base_dir
-    attr_accessor :test_request_output_base_dir
-    attr_accessor :test_request_problem_templates_dir
-
-    # Comment received from the grading script will be filtered
-    # through Configuration#report_comment.  How this method behave
-    # depends on this option; right now only two formats, :short and
-    # :long
-    attr_accessor :comment_report_style
-
-    def report_comment(comment)
-      case comment_report_style
-      when :short
-        if comment.chomp =~ /^[\[\]P]+$/    # all P's
-          'passed'
-        elsif comment.chomp =~ /[Cc]ompil.*[Ee]rror/
-          'compilation error'
-        else
-          'failed'
-        end
-        
-      when :full
-        comment.chomp
-      end
-    end
-
-    # Codes for singleton
-    private_class_method :new
-
-    @@instance = nil
-
-    def self.get_instance
-      if @@instance==nil
-        @@instance = new
-      end
-      @@instance
-    end
-    
-    private
-    def initialize
-      @talkative = false
-      @log_file = nil
-      @report_grader = false
-      @grader_hostname = `hostname`.chomp
-
-      @rails_env = 'development'
-      
-      @comment_report_style = :full
-    end
-
-  end
-
-end