How to change log4jlogger configure method below to use log4j2

Question

while ( appenders.hasMoreElements() ) { final Appender appender = ( Appender ) appenders.nextElement();

            if ( appender instanceof FileAppender ) {
                Logger.getRootLogger().removeAppender( appender );

                final FileAppender fileAppender = ( FileAppender ) appender;
                String filePath = fileAppender.getFile();
                filePath = logOutputDir + "/" + filePath;
                fileAppender.setFile( filePath );

                Logger.getRootLogger().addAppender( appender );
            } // end if
        }