advanced~4h
Capstone: Migrating and Modernizing Across Java Versions
A practical capstone: how to actually move a real codebase across the 8-to-11-to-17-to-21 LTS boundaries, a full before/after worked example that modernizes one method using streams, records, pattern matching, and sealed classes together, and a framework for deciding which JDK a brand-new project should target today.
Learning objectives
- Describe the main breaking changes to plan for at each LTS boundary: 8->11, 11->17, 17->21
- Modernize a realistic pre-Java-8-style method using streams, records, pattern matching, and sealed classes together
- Explain the module system's practical impact on a classpath-based migration, even without adopting modules
- Build a decision framework for choosing a JDK baseline for a new project started today
- Explain why incremental, LTS-to-LTS migration beats skipping straight from a very old baseline to the newest release
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Capstone: Migrating and Modernizing Across Java Versions