Major migrations made easy

on YouTube ↗45m

" summary

Demonstration shows OpenRewrite using an AST-based refactoring engine with exact type attribution and format preservation to upgrade a Spring Petclinic from Spring Boot 1.5 on Java 8 to Spring Boot 2.5 and then to Java 17; discovery lists 217 recipes available and ~50 Spring Boot recipes, scans take ~10–15 seconds, and most changes apply automatically as Java visitor recipes. Result compiles but mvn verify yields two test failures to fix manually.

AI-written summary · about

" chapters (18)

1. 0:00Start
2. 0:30Automating Major Migrations
3. 2:32Spring Boot
4. 2:51Building Microservices
5. 5:57Spring Framework 6
6. 10:40Format Preservation
7. 14:47Running Migration Recipes
8. 16:55Add the Open Rewrite Plugin
9. 20:37Web Parameter Arguments
10. 20:56Application Properties
11. 21:47The Junit Migration
12. 22:35Converting Expected Exceptions
13. 23:13Migrate to Java 11 Using a Different Module
14. 26:25Maven Verify
15. 27:40Fixing Static Analysis Findings
16. 29:25Spring Boot Migrator
17. 35:43Resources
18. 44:12Automatic Deletion of Feature Toggles

" related talks

• 51mMajor Migrations Made EasyTim te Beek · JCON Europe 2023
• 15mMajor migrations made easyTim te Beek · Voxxed Days Luxembourg 2022
• 17mMajor migrations made easyTim te Beek · Voxxed Days Zurich 2023
• 13mMajor migrations made easyTim te Beek · Devoxx France 2022
• 13mModernize your money-makerTim te Beek · J-Fall 2023
• 43mAutomate Code Changes - Bringing OpenRewrite to the IDEMartin Lippert · EclipseCon 2023
• 54mHybrid Modernization: Combining OpenRewrite's Precision with LLM Intelligence for SpringRaquel Pau · Spring I/O 2026
• 41mOpen Rewrite – Dive in Automated RefactoringMerlin Bögershausen · JCON EUROPE 2024