Java Renaissance
summary
Java 21 ships with concrete wins: virtual threads (Project Loom) goes final and lets the JVM spawn millions of lightweight threads so IO-bound servers scale without complex async rewrites — Helidon rework matches prior throughput with far simpler code. ZGC adds a generational mode to cut pause impact; Panama (final in 22) simplifies safe native calls and off‑heap memory. Tooling includes a VS Code Java extension and an online playground. Project Leyden shows a ~2× javac startup boost and combined Spring Boot work yields ~4× faster startup.
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chapters (25)
- 0:00Intro
- 2:29A look back at the "bad old days"
- 5:55Turning the ship
- 8:39Skepticism at first...
- 12:18The payoff
- 14:49JDK 21 features
- 16:46Active projects in the OpenJDK community
- 18:41Project Loom
- 20:19Virtual threads
- 22:11Breaking the bottleneck
- 23:47Same abstraction, new mindset
- 24:12Case study: Helidon Níma
- 24:52Garbage collector
- 27:56Project Panama
- 30:42Project Amber
- 31:42Data-oriented programming
- 32:52Java in the small
- 33:57Paving the on ramp
- 36:35Oracle Java platform extension for VS Code
- 37:23Java playground
- 41:33Yesterday's solutions, today's problems
- 42:43Call to action
- 43:12Project Leyden
- 43:54Why do we do it this way?
- 46:21Outro
