Refactoring to Modernize Java Applications
summary
Demonstrates automated refactors that upgrade a Maven project from Java 11 to Java 21, changing pom.xml and source—examples replace list.get(0)/get(size-1) with getFirst/getLast and convert loops to streams—using OpenRewrite with a lossless syntax tree so comments and formatting survive. Recipes run incrementally (11→17→21), can be custom‑written, and cut multi‑project work from months to minutes; tooling and Copilot integration work but remain flaky, so tests and review are essential.
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chapters (8)
- 0:00Modernization benefits and challenges
- 4:09Overcoming refactoring fears
- 8:30Role of tools and AI
- 14:44Introduction to Open Rewrite
- 20:16Practical code refactoring demonstration
- 31:25Executing automated upgrades
- 40:39Reviewing upgrade results
- 46:14AI-assisted refactoring with Copilot
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