Listeners

http://www.onjava.com/pub/a/onjava/2001/04/12/listeners.html?page=1
Enhancements in Servlet 2.4(in J2EE 1.4)
Explore the new Servlet 2.3 and JavaServer Pages 1.2 specifications and how they can help make programming easier
Lifecycle Events Monitor Context Changes

Filters

Filters
The Essentials of Filters
http://www.onjava.com/pub/a/onjava/2003/11/19/filters.html
http://www.onjava.com/pub/a/onjava/2004/03/03/filters.html
http://www-106.ibm.com/developerworks/java/library/j-tomcat/?open&l=101,t=grj,p=TomcatTricks
Filters Example and Explanation

Conncetion Related

Database connection leaks issues
http://edocs.bea.com/wls/docs81/ConsoleHelp/domain_jdbcconnectionpool_config_connections.html
http://otn.oracle.com/oramag/oracle/02-sep/o52jdbc.html
http://www-106.ibm.com/developerworks/java/library/wi-tip28.html

JSTL

JSTL 1.0: What JSP Applications Need, Part 1
JSTL 1.0: What JSP Applications Need, Part 2
JSTL 1.0: What JSP Applications Need, Part 3
JSP Standard Tag Library eases Webpage development

JBOSS

www.jboss.org/docs/index#free-32x
stuff from www.coredevelopers.net/
JBoss Meets Eclipse: Introducing the JBoss-IDE
saloon.javaranch.com/cgi-bin/ubb/ultimatebb.cgi?ubb=forum&f=63
Get Started with JBoss Application Server