Articles
Don't Use System.out.println! Use Log4j by Vipan Singla
Instant logging: Harness the power of log4j with Jabber by Ruth Zamorano and Rafael Luque, in developerWorks 2003
Reporting Application Errors by Email by Sean C. Sullivan, 2004-09-24, published by O'Reilly.
Log4j, a logging package for the Java language by Ceki Gülcü
http://kin.naver.com/knowhow/entry.php?eid=ETRIk9g6g6zJIFsgp3gHDTsLgD9Qdue6
1 private final Logger log = Logger.getLogger(getClass());
2
3 if (log.isDebugEnabled()) {
4 log.debug("...");
5 }