At this point, about 3 years later, there are many deprecated parts in the jdk version and spring boot, jpa, hateoas, etc., so I would appreciate it if you could add the changed information to the supplementary lecture materials in the future! I am following the lecture by referring to the materials and docs shared in the community, but overall, it is somewhat inconvenient for the lecturer to spend time on such parts, so I am leaving a review. Based on the time I listened to it, I liked the detailed explanation of the implementation process!