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Most Java teams carry more technical debt than they realize. Moving from JDK 8 or 11 to JDK 21 or 25 isn’t a simple upgrade, it’s a shift across a decade of removals, encapsulation, JPMS changes, GC updates, and performance improvements that reshape how you deploy software.

This talk gives developers & architects a direct look at what modernizing a large Java fleet involves. What breaks, why it breaks, how to diagnose issues, and how to build a repeatable migration path without risking the platform or the budget.

The session includes:

• Using JDK tooling (jdeps, jdeprscan, runtime flags) to find hidden technical debt.
• Internal API removals, split-package problems, and reflection failures.
• Practical migration strategies.
• How JPMS affects legacy code.
• The support landscape.
• Why JDK 25 is a stable long-term target.

If you run real Java systems, this session gives you the map, the risks, and the safe route forward.

➤ https://noregressions.substack.com/p/how-to-migrate-from-java-8-to-java