Foojay Podcast #28: Java 21 Has Arrived!

Since 2018, we get a new version of Java every 6 months.

And version 21, released during today, is a long-term support version that can be used for many years.

It also brings a lot of new features and improvements in both the language and the runtime.

Actually, there are so many that we’ll probably not get all of them discussed in this podcast!

Let’s see what our experts find the most important facts we need to know about Java 21.

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Guests

Mohamed Taman

• https://twitter.com/_tamanm
• https://www.linkedin.com/in/mohamedtaman/
• https://foojay.io/today/hidden-and-not-so-hidden-gems-in-java-20/

Piotr Przybyl

• https://mstdn.social/@piotrprz
• https://twitter.com/piotrprz
• https://www.linkedin.com/in/piotrprzybyl/
• https://softwaregarden.dev/en/about-me/

Simon Ritter

• https://mastodon.social/@speakjava
• https://twitter.com/speakjava
• https://www.linkedin.com/in/siritter/

Podcast

Host: Frank Delporte

• https://foojay.social/@frankdelporte
• https://twitter.com/FrankDelporte

Content

00:00 Intro and introduction of the guests

01:51 Excitement about the OpenJDK 21 release

04:18 What is Long Term Support?
https://twitter.com/nipafx/status/1676908785313492992

06:07 Every OpenJDK release is stable and production-ready
https://www.linkedin.com/posts/mohamedtaman_aws-activity-7101961717521264640-F8jh

11:44 Next LTS in two years

12:06 Should you wait a bit before using 21?

13:07 About JEPs, new versus incubator and preview
https://openjdk.org/projects/jdk/21/

17:13 JEP 444 : Virtual Threads
https://softwaregarden.dev/en/posts/new-java/loom/dont-look-at-virtual-threads/

22:30 JEP 430 : String Templates
https://blogs.oracle.com/javamagazine/post/java-21-sneak-peek

26:05 JEP 440 : Record Patterns + JEP 441 Pattern Matching for switch

27:11 JEP 442 : Foreign Function & Memory API (Third Preview)

29:05 Energy efficiency of Java

https://thenewstack.io/which-programming-languages-use-the-least-electricity/

30:55 How Java evolves by inspiration of other languages

33:56 Difference between OpenJDK projects and JEPs

35:06 JEP 445 : Unnamed Classes and Instance Main Methods (Preview)

40:55 Dummies book “OpenJDK Migration”
https://foojay.io/today/book-announcement-openjdk-migration-guide-for-dummies/

42:28 What will Java 22 bring?

43:27 JEP 443 : Unnamed Patterns and Variables (Preview)

45:18 JEP 439 : Generational ZGC
https://foojay.io/today/what-should-i-know-about-garbage-collection-as-a-java-developer/

49:33 Performance improvements by using newer runtimes

51:23 JEP 451 : Prepare to Disallow the Dynamic Loading of Agents

52:37 Looking back at the 6-month release cycle introduction

55:00 Outro