JavaOne 2026 Session

Summary

Upgrading Java apps to newer version of JDKs is simple, but not so easy when you're responsible for upgrading thousands of apps. At LinkedIn, the Java team built tooling for A/B testing, performance monitoring, automation for PR creation, and drove the migration. We'll share our Java 17 migration journey (successes and surprises) as well as the road ahead for helping similar large-scale Java migrations.

The Java 17 migration we've done has huge impact, including an observed average throughput gain of 12.39% and median P99 Latency gain of 2.71%. And we've saved 3,871 hosts for 205 apps without touching a single line of application code.