Java 20 / JDK 20: General Availability

#1

Post by mfiguiere » Tue, Mar 21, 2023, 2:30 PM UTC

Java 20 / JDK 20: General Availability
mail.openjdk.org

Re: Java 20 / JDK 20: General Availability

#2

Post by ar9av » Tue, Mar 21, 2023, 2:36 PM UTC

Gist: ``` JDK 20 introduces six features: - Scoped values for safe sharing of data across threads - Record patterns for declarative data navigation and processing - Foreign function and memory API for interoperation with code and data outside the Java runtime - Virtual threads for lightweight concurrent programming - Structured concurrency for simplified multithreaded programming - Pattern matching for switch statements and expressions for concise and safe complex data-oriented queries ```

Re: Java 20 / JDK 20: General Availability

#3

Post by mfiguiere » Tue, Mar 21, 2023, 2:39 PM UTC

A good coverage of all the JEPs included in JDK 20: https://foojay.io/today/its-java-20-release-day-heres-whats-...

Re: Java 20 / JDK 20: General Availability

#4

Post by PaulHoule » Tue, Mar 21, 2023, 3:05 PM UTC

Note all the new cool stuff is incubator and preview status and I'm a little worried that this will still be the case for the JDK 21 stable release.

Re: Java 20 / JDK 20: General Availability

#5

Post by ludovicianul » Tue, Mar 21, 2023, 3:08 PM UTC

PaulHoule wrote: post #4

Note all the new cool stuff is incubator and preview status and I'm a little worried that this will still be the case for the JDK 21 stable release.

I have hopes to see Virtual Threads in Java 21, also being the next LTS.

Re: Java 20 / JDK 20: General Availability

#6

Post by grishka » Tue, Mar 21, 2023, 3:17 PM UTC

PaulHoule wrote: post #4

Note all the new cool stuff is incubator and preview status and I'm a little worried that this will still be the case for the JDK 21 stable release.

IIRC they are going to release pattern matching for switch and record deconstruction as stable in JDK 21.

Re: Java 20 / JDK 20: General Availability

#7

Post by carimura » Tue, Mar 21, 2023, 3:19 PM UTC

More details on 20:

Announcement: https://inside.java/2023/03/21/the-arrival-of-java-20/

VM improvements: https://tschatzl.github.io/2023/03/14/jdk20-g1-parallel-gc-c...

Non-JEP Improvements: https://nipafx.dev/java-20-guide/

Re: Java 20 / JDK 20: General Availability

#8

Post by rfrec0n » Tue, Mar 21, 2023, 3:20 PM UTC

PaulHoule wrote: post #4

Note all the new cool stuff is incubator and preview status and I'm a little worried that this will still be the case for the JDK 21 stable release.

I think this is supposed to be the last preview version of FFI and the other JEPs from Project Panama, so hopefully we will have them at least but I definitely share a bit of that concern.

Re: Java 20 / JDK 20: General Availability

#9

Post by Idiot_in_Vain » Tue, Mar 21, 2023, 3:27 PM UTC

Damn, time flies.

I remember the excitement from the different alpha/beta versions that were coming out in 1994/1995.

Re: Java 20 / JDK 20: General Availability

#10

Post by garblegarble » Tue, Mar 21, 2023, 3:28 PM UTC

This is exciting, can't wait for the LTS release next year... that said, I don't much care for the "case SomeType t when ..." pattern matching syntax, I don't see the benefit of introducing a new keyword over using "if"... or even just "&&". To pinch the example used in[1]:

    case Tuner t && guitar.isInTune() -> ...;

and

    case Tuner t if guitar.isInTune() -> ...;

both seem as clear as

    case Tuner t when guitar.isInTune() -> ...;

...am I misunderstanding the reasoning here? Is it being introduced to keep the grammar definition simpler?

1: https://foojay.io/today/its-java-20-release-day-heres-whats-...