Migrating from spring data JPA to spring data JDBC

src: Migrating from (Spring Data) JPA to Spring Data JDBC by Jens Schauder @ Spring I/O 2024 - 2024-05-31

Abstract

To migrate, you better have tests. The speaker suggest using baby-steps and the mikado method to migrate.

• spring data jdbc uses aggregate
• you can choose breadth-first (callers) or depth (migrating the repositories) first when migrating

Steps to migrate (mostly untangling JPA):

• Remove extra repositories.
• Remove cascade between aggregates.
  • Bidirectional-references → Unidirectional-references.
• ⚠️ spring data JPA is “smart” and save the aggregate when going out of the transaction, i.e. without calling repository.save.
• Make M:N join tables explicit.
  • Create an entity for this join.
• Add spring data jdbc.
• Create Read/Write converter.
• Migrate one aggregate at a time.

Reviews

2024-10-17

Why did I want to read/watch this? I’m interested about spring data jdbc.

What did I get out of it? Nothing much, since I’m not planning to do any persistence layer migration anytime soon…