How to remove log statements (Warning & Error messages).

Hi Friends,
I am using apache fop to generate pdf through web. 

Foll. is the method used for rendering pdf.
        /**
         * renders an FO inputsource into a PDF file which is rendered
         * to File.
         */
        public void renderFO(InputSource foFile,
                                                 FileOutputStream out)
throws Exception {
                try {


                        Driver driver = new Driver(foFile, out);
                        driver.setRenderer(Driver.RENDER_PDF);
                        driver.run();

                } catch (Exception ex) {
                        throw ex;//new ServletException(ex);
                }

        }

In the log file I am getting so many warning and error messages. Can you
please guide me how to remove these unwanted warning and error statements.

Thanks & Regards
Purvesh Vora

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