Explore a solution to some unit #test fails on #JDK17. By @navczydev

https://www.droidcon.com/2023/04/20/unit-test-fails-on-jdk17-what-is-the-problem/

Explore a solution to some unit #test fails on #JDK17. By @navczydev

I just published Unit test fails on JDK17 — what is the problem?

https://proandroiddev.com/unit-test-fails-on-jdk17-what-is-the-problem-70d486252140

#AndroidDev #androidstudio #jdk17 #testing #kotlin

Project Lilliput
"explore techniques to downsize Java object headers in the Hotspot JVM from 128 bits to 64 bits or less"

In 2022:
* achieved 64-bit headers https://mail.openjdk.org/pipermail/lilliput-dev/2022-May/000457.html
* published #JDK17 fork with that https://github.com/openjdk/lilliput-jdk17u

In 2023:
* work towards merge of 64-bit headers into JDK main line
* work towards 32-bit headers

In the meantime, you can find out Lilliput's impact on your codebase with JOL: https://github.com/openjdk/jol

@shipilev gave some numbers on 🐦: https://twitter.com/shipilev/status/1615095410569232384

#11: More String Deduplication

On average, ~25% of heaps are char arrays for strings and roughly half of them are duplicates. 😳 Since 2017, G1 deduplicates them, which saves ~10% heap size.

Other GCs followed suit:
#JDK17: Shenandoah
#JDK18: ZGC, Serial GC, and Parallel GC

https://evacchi.github.io/java/records/jbang/2022/02/13/type-you-an-actor-runtime-java-17-switch-expressions.html
#java #jdk17

Tiny actor system in Java: https://evacchi.github.io/java/records/jbang/2022/02/13/type-you-an-actor-runtime-java-17-switch-expressions.html
#java #jdk17

RT @sundararajan_a@twitter.com

I accidentally deleted my old tweet - restoring it from archive :)

Do you use Unsafe::defineAnonymousClass?
It's removed in #jdk17

https://bugs.openjdk.org/browse/JDK-8243287

Replacements:

MethodHandles.Lookup::defineHiddenClass MethodHandles.Lookup::defineHiddenClassWithClassData

#java #jdk15

🐦🔗: https://twitter.com/sundararajan_a/status/1594684566195048449

RT @sundararajan_a@twitter.com

I accidentally deleted my old tweet - restoring it from archive :)

Do you use Unsafe::defineAnonymousClass?
It's removed in #jdk17

https://bugs.openjdk.org/browse/JDK-8243287

Replacements:

MethodHandles.Lookup::defineHiddenClass MethodHandles.Lookup::defineHiddenClassWithClassData

#java #jdk15

🐦🔗: https://twitter.com/sundararajan_a/status/1594684566195048449

RT @java@twitter.com

Java 17 is now available! #Java17 #JDK17 #OpenJDK

Download now: https://social.ora.cl/6013y4ya7
Release notes: https://social.ora.cl/6019y4yxD
API Javadoc: https://social.ora.cl/6011y4yx1
Documentation: https://social.ora.cl/6012y4yxG

🐦🔗: https://twitter.com/java/status/1437785745163497479

RT @mreinhold@twitter.com

Java 17 / JDK 17: General Availability: https://j.mp/3tFN45J #jdk17 #java17 #openjdk #java

🐦🔗: https://twitter.com/mreinhold/status/1437784468220153863

RT @mreinhold
Java 17 / JDK 17: General Availability: https://j.mp/3tFN45J #jdk17 #java17 #openjdk #java