How does Hibernate 7 work with Spring Boot 4 - what is auto-configured?

In Spring Boot 4, Hibernate 7 is the default JPA provider auto-configured transparently when spring-boot-starter-data-jpa is on the classpath.

<!-- spring-boot-starter-data-jpa includes:
     - hibernate-core 7.x
     - spring-data-jpa
     - HikariCP connection pool
     - jakarta.persistence-api 3.2 -->

# Complete application.yml for Hibernate 7 in Spring Boot 4:
spring:
  datasource:
    url: jdbc:postgresql://localhost:5432/mydb
    username: ${DB_USER}
    password: ${DB_PASSWORD}
    hikari:
      maximum-pool-size: 20
  jpa:
    hibernate:
      ddl-auto: validate
    show-sql: false
    open-in-view: false  # CRITICAL: disable OSIV in production!
    properties:
      hibernate:
        format_sql: true
        default_batch_fetch_size: 100
        jdbc:
          batch_size: 50
          order_inserts: true
          order_updates: true

logging:
  level:
    org.hibernate.SQL: DEBUG
    org.hibernate.orm.jdbc.bind: TRACE

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