logging to a file log4j
// How to log to a file using log4j :
String filePath = "D:/Logs/MyFirstLog.log";
PatternLayout layout = new PatternLayout("%-5p %d %m%n");
RollingFileAppender appender = new RollingFileAppender(layout, filePath);
appender.setName("MyFirstLog");
appender.setMaxFileSize("20MB");
appender.activateOptions();
logger.addAppender(appender);
logger.info("this will be printed in the provided log file");