og4j.rootlogger=debug, stdout, rlog4j.appender.stdout=org.apache.log4j.
                consoleappender
log4j.appender.stdout.layout=org.apache.log4j.patternlayout
# pattern to output the caller´s file name and line number.
log4j.appender.stdout.layout.conversionpattern=%d %5p [%t] (%f:%l) - %m%n
log4j.appender.r=org.apache.log4j.rollingfileappender
log4j.appender.r.file=yesftp.log
log4j.appender.r.maxfilesize=1000kb
# keep one backup file
log4j.appender.r.maxbackupindex=1
log4j.appender.r.layout=org.apache.log4j.patternlayout
log4j.appender.r.layout.conversionpattern=%d %5p [%t] (%f:%l) - %m%n

static {
  propertyconfigurator.configure(
   yesftpclientframe.class.getresource("log4j.properties"));
 }

private static logger logger = logger.getlogger(xx.class);

logger.info(”hello”);

logger.error("oops, got an exception: ", e);