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Java 21 • 2023 • LTS
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Virtual threads (Project Loom)

All About Java 21

LTS with major concurrency ergonomics (virtual threads) and language evolution.

Release overview

Java 21

LTS with major concurrency ergonomics (virtual threads) and language evolution.

Virtual threads (Project Loom)
Outline page

Known context

Java 21 (2023, LTS)

  • Virtual threads make “thread-per-request” style scalable and simpler.
Research prompts
  • What source-language changes became visible to developers in 2023?
  • Which standard-library or tooling shifts made this release historically relevant?
  • How did this release change the path toward later milestones such as Java 5, Java 8, Java 11, or Java 17?
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