Summary
Covers the full upgrade path from Java 8 through 25, hitting each LTS release with the breaking changes that actually matter. Shows you exactly what APIs got removed (JAXB, Security Manager, Unsafe methods), what dependencies to add, and which JVM flags to throw at module system complaints. The migration workflow is sensible: assess, update build config, fix compilation, test, check runtime warnings. Really shines on the feature adoption sections, like showing you when to switch from ThreadLocal to ScopedValues or how virtual threads change concurrency in Java 21. The quick reference tables are clutch when you just need to know what breaks between versions without reading Oracle's release notes.
Install to Claude Code
npx -y skills add decebals/claude-code-java --skill java-migration --agent claude-codeInstalls into .claude/skills of the current project.
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Connect Claude to +800M contacts, +150M companies. Find & Enrich leads in chat.
Try For Free →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →An agent that runs the SEO playbooks that move rankings and ships PRs you control.
Get founding access →
