Spring Boot with Kotlin & JUnit 5 - Tutorial 4 - Data Layer

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# Spring Boot - Data Layer - DTO as Kotlin Data Class
The core of any application are the business entities on which it operates. In Spring Boot, and when building REST APIs, these are commonly (mapped to) data transfer objects, or DTOs for short.
In this video, you create the data layer for your Spring Boot application by implementing a Bank entity. First, we do it as you would (have to) do it in Java, then refactor it to a simple Kotlin data class.
Spring Boot has a default object mapper that knows how to map objects of such entities to and from JSON.

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