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JDK 16 is now in Rampdown Phase Two

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Rory O'Donnell

JDK 16 is now in Rampdown Phase Two

Hi All,

Per the JDK 16 schedule , we are in Rampdown Phase Two [1] .

Please advise if you find any issues while testing the latest Early Access builds.

Schedule for JDK 16

2021/01/14 Rampdown Phase Two
2021/02/04 Initial Release Candidate
2021/02/18 Final Release Candidate
2021/03/16 General Availability

Release Notes [2]

OpenJDK 16 Early Access build 32 is now available at http://jdk.java.net/16

These early-access, open-source builds are provided under the GNU General Public License, version 2, with the Classpath Exception.
Features [3] - the overall feature set is frozen. No further JEPs will be targeted to this release.
Changes in recent builds that maybe of interest:

Build 32:

JDK-8259028 - ClassCastException when using custom filesystem with wrapper FileChannel impl

Apache Lucene found.

JDK-8253996 - Javac error on jdk16 build 18: invalid flag: -Xdoclint:-missing

Apache Zookeeper found.

Build 31:

JDK-8259027: NullPointerException in makeMappedSegment due to NULL Unmapper when length of segment is 0

Reported by Apache Lucene

Build 30:

JDK-8254023: A module declaration is not allowed to be a target of an annotation that lacks an @Target meta-annotation

Reported by JUnit5

JDK-8256693: getAnnotatedReceiverType parameterizes types too eagerly

JDK 16 - topics of interest

Investigating MD5 overheads:
https://cl4es.github.io/2021/01/04/Investigating-MD5-Overheads.html
Towards OpenJDK 17 - a quick update on startup performance
https://cl4es.github.io/2020/12/06/Towards-OpenJDK-17.html
Migrating OpenJDK to Git & GitHub - GitHub Universe 2020 session replay
https://inside.java/2020/12/11/skara-github-universe/

Project Panama/foreign EA Build 16-panama+3-385 (2020/12/10) is available now [4]

What's new

jextract is now fully compatible with Java 16
New architecture based on Foreign-Memory Access API (JEP 370, JEP 383, JEP 393) and Foreign Linker API (JEP 389)

These early-access builds are provided under the GNU General Public License, version 2, with the Classpath Exception
EA builds are produced for the purpose of gathering feedback. Use for any other purpose is at your own risk.
Please send feedback via e-mail to panama-dev@.... To send e-mail to this address you must first subscribe to the mailing list.

Project Panama - topics of interest

“The Vector API” with John Rose and Paul Sandoz
https://inside.java/2020/11/17/podcast-007/
“The Foreign Memory Access API” with Maurizio Cimadamore and Jorn Vernee
https://inside.java/2020/12/11/podcast-009/
“The Foreign Linker API” with Maurizio Cimadamore and Jorn Vernee
https://inside.java/2020/12/21/podcast-010/

OpenJDK 17 Early Access build 5 is now available at http://jdk.java.net/17

These early-access, open-source builds are provided under the GNU General Public License, version 2, with the Classpath Exception.
Changes in recent builds that maybe of interest:

Build 4:

JDK-8258800: Deprecate -XX:+AlwaysLockClassLoader

Build 3:

JDK-8246005: KeyStoreSpi::engineStore(LoadStoreParameter) spec mismatch to its behavior
JDK-8258765: getAnnotatedReceiverType parameterizes types too eagerly

JDK 17 - topic of interest

Towards OpenJDK 17 - a quick update on startup performance:

https://cl4es.github.io/2020/12/06/Towards-OpenJDK-17.html

Java Cryptographic Roadmap [5] has been updated

Removing root certificates with 1024-bit keys in July 2021 CPU.
Disabling of SHA-1 JARS signed after 2019-01-01 has been postponed to July 2021 CPU.

Rgds, Rory

[1] https://mail.openjdk.java.net/pipermail/jdk-dev/2021-January/005001.html

[2] https://jdk.java.net/16/release-notes

[3] http://openjdk.java.net/projects/jdk/16/

[4] https://mail.openjdk.java.net/pipermail/panama-dev/2020-December/011605.html
[5] https://java.com/en/jre-jdk-cryptoroadmap.html