Spring Boot and H2 Database: Integration Example
Learn to configure Spring boot with H2 database to create and use an in-memory database in runtime, generally for unit testing or POC purposes.
Configure In-memory DB to Unit Test Hibernate
Learn to connect to an in-memory database (such as H2 or Hsqldb) from the JUnit 5 unit tests. This will help in writing tests that do not depend on a live database connection.