Can any one suggest what type of framework or pattern should i follow for the three tier architecture for a ebusiness application.
It all depends on the complexities of the system.
There are various patterns like MVC,session facade with occasional message facade, front runner servlet and JDO etc etc
more u can get from sun site j2ee design pattern
check out the first chapter of Rod's j2ee design book. this is the best j2ee book i have read so far.
This site has a design pattern book for download? Also, see Sun's pattern? You know Sun's site, don't you?