'Re: JDK 19 - Virtual Threads Testing!'

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List:       ant-dev
Subject:    Re: JDK 19 - Virtual Threads Testing!
From:       Jaikiran Pai <jaikiran () apache ! org>
Date:       2022-05-21 15:53:30
Message-ID: 68b74669-69cc-25c0-6bde-a199423f9d54 () apache ! org
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Hello David,

I did a quick run of our Ant project testsuite against the Java 19 EA 
version (build 19-ea+23-1706). This round of testing did _not_ enable 
preview features and thus it didn't test virtual threads yet. I just 
wanted to make sure this EA version works fine without virtual threads 
feature enabled. Our test results show that things work fine except for 
a change in behaviour in an unrelated area (javax.imageio) for which 
I've opened a JBS issue https://bugs.openjdk.java.net/browse/JDK-8287120.

In the next few days I'll runs tests against the Ant testsuite by 
enabling virtual threads preview feature and see how it goes.

-Jaikiran

On 16/05/22 1:13 pm, David Delabassee wrote:
> Welcome to a new Quality Outreach update!
>
> This time, we have one update but a major one: JEP 425 (Virtual 
> Threads preview) has been integrated into the OpenJDK mainline! JDK 19 
> Early-Access builds 22 are the first mainline builds with Virtual 
> Threads (preview) support. So, Project Loom is now getting closer and 
> closer!
>
> Please make sure to check the Heads-up below even if you don't intend 
> to use virtual threads in the short future.
>
>
> ## Heads-up - JEP 425 Virtual Threads (preview) testing
>
> The goal of Project Loom is to introduce in the Java platform an 
> easy-to-use, high-throughput lightweight concurrency model, and a 
> related new concurrent programming model.
>
> Developed in Project Loom, JEP 425 introduces virtual threads to the 
> Java Platform. Virtual threads are lightweight threads that 
> dramatically reduce the effort of writing, maintaining, and observing 
> high-throughput concurrent applications. Note that virtual threads are 
> a preview API in JDK 19. Please make sure to read 'JEP 425: Virtual 
> Threads (Preview)' for a detailed explanation.
>
> A lot of testing has already been done but we are asking, once again, 
> your help to test your project(s) with the latest JDK 19 Early-Access 
> builds, even if you don't intend to use virtual threads any time soon.
>
> There are two approaches to test your project:
> 1. Update your code to use virtual threads …or
> 2. Simply test your existing unchanged code with the preview feature 
> enabled.
>
> Both approaches should yield valuable feedback.
>
> If you choose to adapt your application to use virtual threads (cf. 
> JavaDoc [2]), be aware that in some cases it's not just about updating 
> your code to use virtual threads instead of platform threads; there 
> are some additional considerations. For example, virtual threads 
> shouldn't be pooled [3], code that relies heavily on thread locals [4] 
> will require some work to move to a world where there is a new thread 
> for each task, etc.
>
> Given that are some minor behavior changes and that `ThreadGroup` has 
> been degraded, testing your code as-is, i.e., without using virtual 
> threads but with the preview feature enabled at runtime, will also be 
> useful. For more details, please check 'JEP 425 - Risks and 
> Assumptions' [5].
>
> One difference between to the EA builds published by Project Loom and 
> the latest JDK 19 EA builds is that the `--enable-preview` flag is 
> required at run-time to use the new APIs. It's not possible to use the 
> APIs with core reflection to avoid the need for `--enable-preview`.
>
> Finally, some tools especially tools relying on JVM TI agents might 
> not be fully ready for virtual threads.
>
> Your help testing this important update is greatly appreciated, all 
> feedback should be sent to the 'loom-dev' mailing list [6].
>
> [1] https://openjdk.java.net/jeps/425
> [2] 
> https://download.java.net/java/early_access/jdk19/docs/api/java.base/java/lang/Thread.html
> [3] https://openjdk.java.net/jeps/425#Do-not-pool-virtual-threads
> [4] https://openjdk.java.net/jeps/425#Thread-local-variables
> [5] https://openjdk.java.net/jeps/425#Risks-and-Assumptions
> [6] https://mail.openjdk.java.net/pipermail/loom-dev/
>
>
> ## JDK 19 Early-Access builds
>
> JDK 19 Early-Access builds 22 are now available [7], and are provided 
> under the GNU General Public License v2, with the Classpath Exception. 
> Make sure to check the Release Notes [8] and the JavaDoc [9].
>
> [7] https://jdk.java.net/19/
> [8] https://jdk.java.net/19/release-notes
> [9] https://download.java.net/java/early_access/jdk19/docs/
>
> ### Current JDK 19 JEPs
> - 405: Record Patterns (Preview) - Proposed to target
> - 422: Linux/RISC-V Port - Integrated
> - 424: Foreign Function & Memory API (Preview) - Integrated
> - 425: Virtual Threads (Preview) - Integrated
> - 426: Vector API (4th Incubator) - Targeted
> - 427: Pattern Matching for switch (3rd Preview) - Targeted
>
> ### Recent changes that may be of interest:
>
> Build 22:
> - JDK-8284161: Implementation of Virtual Threads (Preview)
> - JDK-8285947: Avoid redundant HashMap.containsKey calls in ZoneName
> - JDK-8212136: Remove finalizer implementation in SSLSocketImpl
> - JDK-8285872: JFR: Remove finalize() methods
> - JDK-8285914: AppCDS crash when using shared archive with old class file
> - JDK-8286163: micro-optimize Instant.plusSeconds
> - JDK-8282420: JFR: Remove event handlers
> - JDK-8282559: Allow multiple search terms in javadoc search
>
> Build 21:
> - JDK-8255552: Add DES/3DES/MD5 to jdk.security.legacyAlgorithms
> - JDK-8278370: [win] Disable side-by-side installations of multiple 
> JDK updates in Windows JDK installers
> - JDK-8281010: [macos] Disable side-by-side installations of multiple 
> JDK updates in macOS JDK installers
> - JDK-8236128: Allow jpackage create installers for services
> - JDK-8279598: provide adapter from RandomGenerator to Random
>
> Build 20:
> - JDK-8284553: Deprecate the DEFAULT static field of OAEPParameterSpec
> - JDK-8283620: System.out does not use the encoding/charset specified 
> in the Javadoc
> - JDK-8285445: Enable Windows Alternate Data Streams by default
> - JDK-8284930: Re-examine FilterInputStream mark/reset
> - JDK-8284890: Support for Do not fragment IP socket options
> - JDK-8282823: javac should constrain more uses of preview APIs
> - JDK-8285477: Add a PRECISION public static field to j.l.Float and 
> j.l.Double
>
> Build 19:
> - JDK-8186958: New Methods to Create Preallocated HashMaps
> - JDK-8284775: Simplify String.substring(_, length()) calls
> - JDK-8283892: Compress and expand bits
> - JDK-8280915: Better parallelization for AbstractSpliterator and 
> IteratorS…
> - JDK-8284681: compiler/c2/aarch64/TestFarJump.java fails with 
> "RuntimeExce…
> - JDK-8283790: G1: Remove redundant card/heap-address transition
> - JDK-8285001: Simplify StringLatin1.regionMatches
> - JDK-8284880: Re-examine sun.invoke.util.Wrapper hash tables
> - JDK-8278356: Improve file creation
>
>
> ## Topics of Interest
>
> - Java Cryptographic Roadmap update 
> https://java.com/en/jre-jdk-cryptoroadmap.html
> - Virtual Thread Deep Dive 
> https://inside.java/2022/04/07/insidejava-newscast-023/
> - Why Write an Empty finalize() Method? 
> https://stuartmarks.wordpress.com/2022/04/27/why-write-an-empty-finalize-method/
> - WHEN and NULL In Pattern Matching 
> https://inside.java/2022/05/05/insidejava-newscast-024/
> - JDK 8 to JDK 18 in GC: 10 Releases, 2000+ Enhancements 
> https://inside.java/2022/05/02/odl-jdk8-to-jdk18-gc/
> - ZGC - What's new in JDK 18 https://malloc.se/blog/zgc-jdk18
> - Java Next - From Amber to Loom, from Panama to Valhalla 
> https://inside.java/2022/05/09/java-next/
>
> ## JDK Update Patch Release
>
> As announced with the April 2022 CPU release, we have produced update 
> patch releases for all Java SE supported versions. The new versions 
> are JDK 18.0.1.1 (publicly available), 17.0.3.1 (publicly available), 
> 11.0.15.1, 8u333, 7u343, and OpenJDK 18.0.1.1 (publicly available).
>
>
> As usual, let us know if you find any issues while testing your 
> project(s) on the latest JDK early-access builds. Thanks for your 
> support!
>
> --David
>
>
>
>
>
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