log4j

http://www.iteye.com/topic/378077

 

http://www.blogjava.net/hwpok/archive/2008/08/23/223891.html

http://www.blogjava.net/hwpok/archive/2008/08/23/223893.html

 

 http://www.cnblogs.com/rushoooooo/archive/2011/08/29/2157361.html