I have uploaded one of the best books (of course ebook) about designpatterns. you can download and enjoy it.Here is the link:www.sci.org.ir/.../Design_Patterns_Elements_of_Reusable_Software__Addison_Wesle.pdf
This youtube link has lot of J2EE Related viedos and playlist has been created for easy learning..watch and learn .. Subscribe this channal to get update about the upcoming viedos..https://www.youtube.com/user/ramram43210/videoshttps://www.youtube.com/user/ramram43210/videos?sort=da&view=0&flow=grid