---
title: 'JDK 21 in Rampdown Phase Two'
url: 'https://www.tutego.de/blog/javainsel/2023/08/jdk-21-in-rampdown-phase-two'
markdown: 'https://www.tutego.de/blog/javainsel/2023/08/jdk-21-in-rampdown-phase-two.md'
date: '2023-08-09'
description: '"JDK 21 is in Rampdown Phase Two. The overall feature set is frozen. No further JEPs will be targeted to this release." https://openjdk.org/projects/jdk/21/ Features (previews omitted): JSR 431: Sequenced Collections JSR 439: Generational ZGC JSR 440: Record Patterns JSR 441: Pattern Matching for …'
taxonomy:
  category:
    - 'Java News'
    - 'Java 21'
---

# JDK 21 in Rampdown Phase Two

![Illustration einer tropischen Insel mit Palmen und einem hohen Berg](https://www.tutego.de/blog/javainsel/user/themes/tutego/images/insel-cover.jpg)# Java Blog für Programmierer

[Java Blog für Programmierer](https://www.tutego.de/blog/javainsel/)

## JDK 21 in Rampdown Phase Two

09.08.2023 · [Christian Ullenboom](https://www.tutego.de/blog/javainsel/author/admin/)

"JDK 21 is in Rampdown Phase Two. The overall feature set is frozen. No further JEPs will be targeted to this release." <https://openjdk.org/projects/jdk/21/>Features (previews omitted):

- JSR 431: Sequenced `Collections`
- JSR 439: Generational ZGC
- JSR 440: Record Patterns
- JSR 441: Pattern Matching for switch
- JSR 444: Virtual Threads
- JSR 449: Deprecate Windows 32-bit Port
- JSR 451: Prepare to Disallow the Dynamic Loading of Agents
- JSR 452: Key Encapsulation Mechanism API

Kategorien: [Java News](https://www.tutego.de/blog/javainsel/category/java-news/), [Java 21](https://www.tutego.de/blog/javainsel/category/java-21/)

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