Sorted:

Spring Transaction Management: @Transactional In-Depth

Defining Unique Constraints in JPA

JUnit 5: Writing Nested Tests

Guide to @ConfigurationProperties in Spring Boot

Flyway Migrations With Spring Boot

Guide to Resilience4j

Guide to Spring Retry

Docker Power for Spring Boot Integration Testing

Guide to JUnit 5 Parameterized Tests

Spring Boot : How to add JPA and Hibernate Envers Auditing