Has Spring-boot changed the way auto-increment of ids works through @GeneratedValue?

Question

Spring-Boot 2.0.0 seems to have modified the way Hibernate is auto configured.

Let\'s suppose two simple and independent JPA entities:

Answer 1

Spring Boot 2.0 uses Hibernate 5.2 (https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.0-Release-Notes).
Hibernate changes its GeneratedType.AUTO strategy since 5.2. Any database that does not support sequences natively (e.g. MySQL), they use the TABLE generator instead of IDENTITY. (https://hibernate.atlassian.net/browse/HHH-11014)

That's why GeneratedType.AUTO does not work as you expected.