Core J2EE Pattern

Business Delegate
Composite View
Data Access Object
Dispatcher View
Front Controller
Intercepting Filter
Service Activator
Service Locator
Transfer Object
Transfer Object Assembler
View Helper

Links

http://java.sun.com/
Core J2EE Patterns: Patterns index page
http://java.sun.com/blueprints/corej2eepatterns/Patterns/index.html