JEE Interview Questions and answers
Aide mémoire Java
http://www.ncottin.net/download/ServletsJSP.pdf
http://www.fresherventure.net/frequently-asked-j2ee-interview-questions-and-answers/
http://inheritingjava.blogspot.com/p/javaj2ee-interview-questions-with.html
Design Pattern:
http://www.vogella.com/designpattern.html
http://www.vogella.com/articles/DesignPatterns/article.html