def generate_report
    result = ""
    IO.popen %Q{java -Djava.awt.headless=true -cp "#{INTERFACE_CLASSPATH}" CrystalDBReport --report_design="#{@report_design}" --username="#{@username}" --password="#{@password}" --jdbc_driver_name="#{@jdbc_driver_name}" --jdbc_connect_string="#{@jdbc_connect_string}" --report_format="#{@format}"}, "w+b" do |pipe|
      result = pipe.read
      pipe.close
    end
    result
  end