OpenJDK Quality Outreach: JDK 23 is GA, JDK 24 EA builds

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David Delabassee

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Oct 25, 2024, 10:12:14 AM10/25/24

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Welcome to the latest OpenJDK Quality Outreach update!

JDK 23 was released last month as planned. You can read "The Arrival of Java 23" announcement here, and additional Java 23 materials in the "Topics of Interest" section at the bottom of this update. You can also rewatch the Java 23 launch stream. Thank you to all the projects who contributed to this release by testing the early-access builds and by providing feedback and or identifying issues. Through your participation in this program, you are helping to shape the Java platform!

Let's now shift our attention to JDK 24 which will enter Rampdown Phase 1 in less than 6 weeks on December 5th.

JDK 24

The JDK 24 early-access builds 21 are available, and are provided under the GNU General Public License v2, with the Classpath Exception. The Release Notes are available here.

As of the time of writing, the following JEPs have been targeted to JDK 24

JEP 472: Prepare to Restrict the Use of JNI
JEP 475: Late Barrier Expansion for G1
JEP 485: Stream Gatherers
JEP 484: Class-File API
JEP 489: Vector API (9th Incubator)

while the following JEPs have been proposed to target JDK 24

JEP 404: Generational Shenandoah (Experimental)
JEP 478: Key Derivation Function API (Preview)
JEP 487: Scoped Values (4th Preview)
JEP 490: ZGC: Remove the Non-Generational Mode

Changes in recent JDK 24 builds that may be of interest

JDK-8337302: Undefined type variable results in null - Reported & fixed by ByteBuddy
JDK-8338406: BytecodeHelpers using wrong bootstrap method descriptor for condy - Reported by ByteBuddy
JDK-8338623: StackCounter adding extraneous slots for receiver invoke instructions - Reported by ByteBuddy
JDK-8338661: StackMapTable is invalid if frames appear in dead code - Reported by ByteBuddy
JDK-8338745: Intrinsify Continuation.pin() and Continuation.unpin()
JDK-8338979: Avoid bootstrapped switches in the classfile API
JDK-8338939: Simplify processing of hidden class names
JDK-8335288: SunPKCS11 initialization will call C_GetMechanismInfo on unsupported mechanisms
JDK-8336492: Regression in lambda serialization
JDK-8286851: Deprecate for removal several of the undocumented java launcher options
JDK-8339918: Remove checks for outdated -t -tm -Xfuture -checksource -cs -noasyncgc options from …
JDK-8328608: Multiple NewSessionTicket support for TLS
JDK-8338890: Add monitoring/management interface for the virtual thread scheduler
JDK-8338731: MemoryLayout::offsetHandle can return a negative offset
JDK-8325679: Optimize ArrayList subList sort
JDK-8337664: Distrust TLS server certificates issued after Oct 2024 and anchored by Entrust Root Cas
JDK-8338936: StringConcatFactory optimize the construction of MethodType and MethodTypeDesc
JDK-8338947: Deprecate the UseLinuxPosixThreadCPUClocks flag and remove it in a future release
JDK-8338700: AttributeMapper type parameter should be bounded by Attribute
JDK-8339214: Remove misleading CodeBuilder.loadConstant(Opcode, ConstantDesc)
JDK-8328877: [JNI] The JNI Specification needs to address the limitations of integer UTF-8 String lengths
JDK-8338894: Deprecate jhsdb debugd for removal
JDK-8334165: Remove serialVersionUID compatibility logic from JMX
JDK-8334870: javac does not accept classfiles with certain permitted RuntimeVisibleParameterAnnotations…

Note: A complete list of changes can be found here.

JavaFX 24 Early-Access Builds

These are early access builds of the JavaFX 24 Runtime built from openjdk/jfx. These builds enable JavaFX application developers to build and test their applications with JavaFX 24 on JDK 24. Although these builds are designed to work with JDK 24-ea, they are also known to work with JDK 22 and later versions.

The latest early access builds of JavaFX 24 Builds 14 (2024/10/18) are available, under the GNU General Public License, version 2,

with the Classpath Exception. JavaFX 24 API Javadocs are available too.

Topics of Interest

As usual, please ping me if you have questions, suggestions or if you encounter any issues with JDK 24 early-access builds.
If you don't want to receive these OpenJDK Quality Outreach updates anymore, let us know by replying to this email or by pinging me directly.

David Delabassée

david.delabassee(at)oracle_com

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