The lecture content is really good. I had to use QueryDSL, so I searched the Internet and found the instructor's lecture. The lecture content seemed really good, so I watched it and I am very satisfied. Now I have to develop QueryDSL at my company. I also bought the instructor's JPA book. I actually developed JPA by searching only the necessary parts and roughly knowing it, but I will have to watch all the previous lectures when I have time. Thank you for the great lecture.