How to Set Up H2 In-Memory Database in a Spring Boot CRUD App

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A developer building a Spring Boot CRUD application switched from using a linked list to a database to enable persistent data storage. They chose the H2 in-memory database as a beginner-friendly option that requires no separate installation or configuration of heavier systems like MySQL or PostgreSQL. The setup involves configuring three key sections in the application.properties file: H2 database connection details, JPA settings, and the H2 web console. JPA, or Jakarta Persistence API, allows developers to interact with the database using Java code instead of writing raw SQL queries. The guide also notes that the Spring Data JPA dependency must be added to the project's pom.xml file for the integration to work.

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