This project is used to show a journey how Java and Kotlin meet together in a same project. This project is not only include the final solution but also how intermediate problems are graduately solved in each step/commit.
To see full explanation about how this project comes and detail for each commit, let's check this medium blog https://medium.com/@talerngpong/journey-of-spring-boot-project-with-java-and-kotlin-48829b542c25.