# File ruby/jlambda.rb, line 100
        def add_field(src)
          src += ";" unless src =~ /;/
          begin
                f = :javassist_CtField.jclass.make(src.split("\n").join,@ctclass)
                @ctclass.addField(f)
          rescue => e
                raise RuntimeError.new("Can not make a field of #{@classname} => #{e.message}")
          end
        end