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Hibernate / Hibernate 7 Basics Interview Questions

How does Hibernate 7 handle schema validation and generation (hbm2ddl)?

Hibernate can validate or generate the DB schema from entity mappings. Controlled by hibernate.hbm2ddl.auto.

hbm2ddl.auto values
ValueBehaviourUse in
noneNo schema actionProduction (use Flyway/Liquibase)
validateValidates entity mappings match schema; fails on mismatchProduction safety check
updateAdds missing columns/tables; never dropsDevelopment (risky in production)
createDrops and recreates all tables on startupDevelopment/testing
create-dropCreates on startup; drops on SessionFactory closeUnit tests
# Recommended production setup:
spring:
  jpa:
    hibernate:
      ddl-auto: none       # Hibernate does NOT touch schema
  flyway:
    enabled: true          # Flyway manages schema with versioned migrations
    locations: classpath:db/migration

# Development:
spring:
  jpa:
    hibernate:
      ddl-auto: create-drop  # fresh schema each run

# Flyway migration files:
# db/migration/V1__create_products_table.sql
# db/migration/V2__add_category_to_products.sql

What does hibernate.hbm2ddl.auto=validate do at startup?
What is the recommended approach for managing schema in a production Hibernate 7 application?

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