Re: [External] : Re: JDK 20 Rampdown Phase 2 & JMX Heads-up

[David Delabassee <da...@oracle.com>]

Good news, thanks a lot for all your efforts!

--David

On 26/01/2023 00:08, Rick Hillegas wrote:
> Thanks, David. I can confirm that Derby builds and tests cleanly using 
> Open JDK build 20-ea+32-2328. Cheers
>
> On 1/24/23 9:11 PM, David Delabassee wrote:
>> Hi,
>>
>> First off, on behalf of Oracle’s Java Team, I’d like to wish you a 
>> happy and prosperous new year!
>>
>> In 2023, two Java releases will be made available: JDK 20 (March) &  
>> JDK 21 (September).
>>
>> JDK 20 [1] has entered Rampdown Phase Two (RDP2) [2], its initial 
>> Release Candidate is planned for February 9. Given that and to be 
>> better prepared for the future, it makes sense to begin testing your 
>> project(s) using JDK 21 early-access (EA) builds. Your feedback 
>> allows us to evaluate and address issues you find while testing EA 
>> builds.
>>
>> [1] 
>> https://urldefense.com/v3/__https://jdk.java.net/20/__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOossskVg7$ 
>> [2] https://mail.openjdk.org/pipermail/jdk-dev/2023-January/007308.html
>> [3] 
>> https://urldefense.com/v3/__https://jdk.java.net/21/__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOomhdGAGL$ 
>>
>>
>> ## Heads-up - JDK 21: JMX Subject Delegation & Fine-grained Security 
>> Deprecation
>>
>> JMX has some features that rely on Security Manager APIs which are 
>> deprecated for removal (see JEP 411 [4]). These features are "Subject 
>> Delegation" and "Fine-grained Security", which both seem to be 
>> generally unused, and would require significant investment to 
>> implement without touching the deprecated APIs. As a consequence, 
>> "Subject Delegation" is being proposed for deprecation in JDK 21 [5].
>>
>> Fine-grained Security is also being considered for deprecation at the 
>> same time. This feature [6] has allowed configuration of a security 
>> policy to restrict or permit access to specific MBean actions. It is 
>> expected that this feature is generally unused, possibly because 
>> there is simply no demand for such detailed control, and that it is 
>> too complex to create and maintain the policies.
>>
>> [4] https://openjdk.org/jeps/411
>> [5] https://bugs.openjdk.org/browse/JDK-8298966
>> [6] 
>> https://docs.oracle.com/en/java/javase/19/jmx/fine-grained-security-example.html
>>
>>
>> ## JDK 20 Early-Access builds
>>
>> The latest early-access builds of JDK 20 (builds 32) are available 
>> [7], and are provided under the GNU General Public License v2, with 
>> the Classpath Exception. The Release Notes are available here [8].
>>
>> [7] https://openjdk.org/projects/jdk/20/
>> [8] 
>> https://urldefense.com/v3/__https://jdk.java.net/20/release-notes__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOoi7nrCpJ$ 
>>
>> ### JEPs integrated into JDK 20:
>>
>> - JEP 429: Scoped Values (Incubator)
>> - JEP 432: Record Patterns (2nd Preview)
>> - JEP 433: Pattern Matching for switch (4th Preview)
>> - JEP 434: Foreign Function & Memory API (2nd Preview)
>> - JEP 436: Virtual Threads (2nd Preview)
>> - JEP 437: Structured Concurrency (2nd Incubator)
>>
>> ### Changes in recent JDK 20 builds that may be of interest:
>>
>> - JDK-8298525: javadoc crashes with "UnsupportedOperationException: 
>> Not yet implemented" in SeeTaglet.inherit [Reported by Apache Ant]
>> - JDK-8298893: Rename option UsePolyIntrinsics to UsePoly1305Intrinsics
>> - JDK-8287411: Enhance DTLS Performance
>> - JDK-8293554: Enhanced DH Key Exchanges
>>
>>
>> ## JDK 21 Early-Access builds
>>
>> The latest early-access builds of JDK 21 (builds 6) are available 
>> [9], and are provided under the GNU General Public License v2, with 
>> the Classpath Exception. The related EA API Javadoc is also available 
>> [10].
>>
>> [9] 
>> https://urldefense.com/v3/__https://jdk.java.net/21/__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOomhdGAGL$ 
>> [10] 
>> https://urldefense.com/v3/__https://download.java.net/java/early_access/jdk21/docs/api/__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOomHP4Lwr$ 
>>
>> ### Changes in recent JDK 21 builds that may be of interest:
>>
>> - JDK-8297295: Remove ThreadGroup.allowThreadSuspension
>> - JDK-8287411: Enhance DTLS performance
>> - JDK-8233269: Improve handling of JAVA_ARGS
>> - JDK-8297933: Compiler should only use verified interface types for 
>> optimization
>> - JDK-8298381: Improve handling of session tickets for multiple 
>> SSLContexts
>> - JDK-8299501: Usage of constructors of primitive wrapper classes 
>> should be avoided in java.util API docs
>> - JDK-8299475: Enhance SocketException by cause where it is missing 
>> in net and nio area
>> - JDK-8299544: Improve performance of CRC32C intrinsics (non-AVX-512) 
>> for small inputs
>> - JDK-8299576: Reimplement java.io.Bits using VarHandle access
>> - JDK-8278326: Socket close is not thread safe and other cleanup
>> - JDK-8299673: Simplify object pinning interactions with string 
>> deduplication
>>
>>
>> ## JavaFX 20 & 21 Early-Access Builds
>>
>> These are early-access builds of the JavaFX Runtime, built from 
>> openjdk/jfx [11]. Those EA builds are intended to allow JavaFX 
>> application developers to build and test their applications with 
>> JavaFX 20 on JDK 20. The latest EA builds (JavaFX 20 EA b16 
>> 2023/1/14) are now available [12] and are provided under the GNU 
>> General Public License, version 2, with the Classpath Exception. 
>> Please note that initial JavaFX 21 early-access builds (JavaFX 21 b1 
>> 2023/1/19) are now available [13] as well.
>> Feedback should be reported to the openjfx-dev mailing list [14].
>>
>> [11] 
>> https://urldefense.com/v3/__https://github.com/openjdk/jfx__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOoshv9gt0$ 
>> [12] 
>> https://urldefense.com/v3/__https://jdk.java.net/javafx20/__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOoo-AZQ5m$ 
>> [13] 
>> https://urldefense.com/v3/__https://jdk.java.net/javafx21/__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOopaRuNjZ$ 
>> [14] http://mail.openjdk.org/mailman/listinfo/openjfx-dev
>>
>>
>> ## Topics of Interest:
>>
>> - On Markdown in (Java) documentation comments
>> https://mail.openjdk.org/pipermail/javadoc-dev/2023-January/005563.html
>>
>> - Lifetimes in the Foreign Function & Memory API
>> https://cr.openjdk.java.net/~mcimadamore/panama/why_lifetimes.html
>>
>> - Java's Plans for 2023 - Inside Java Newscast #40
>> https://urldefense.com/v3/__https://inside.java/2023/01/19/newscast-40/__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOomKil46f$ 
>>
>> - Informational JEP: Preview Features: A Look Back, and A Look Ahead
>> https://openjdk.org/jeps/8300604
>>
>> - Java 20 - An Almost Infinite Memory Segment Allocator
>> https://urldefense.com/v3/__https://minborgsjavapot.blogspot.com/2023/01/java-20-almost-infinite-memory-segment.html__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOorStyEbL$ 
>>
>>
>> - Podcast: “Helidon Níma & Virtual Threads”
>> https://urldefense.com/v3/__https://inside.java/2023/01/12/podcast-029/__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOouj1DqWY$ 
>>
>> - From ThreadLocal to ScopedValue with Loom - JEP Café #16
>> https://urldefense.com/v3/__https://inside.java/2023/01/10/jepcafe16/__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOotymDzVO$ 
>>
>> - Java 20 - Colossal Sparse Memory Segments
>> https://urldefense.com/v3/__https://minborgsjavapot.blogspot.com/2023/01/java-20-colossal-sparse-memory-segments.html__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOovA_hcaI$ 
>>
>>
>> - Another Panama Update
>> https://mail.openjdk.org/pipermail/panama-dev/2022-December/018182.html
>>
>> - Secure Coding Guidelines for Java SE
>> https://urldefense.com/v3/__https://inside.java/2023/01/04/secure-coding-guideline/__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOokU3tcgz$ 
>>
>> - Java Networking Enhancements since JDK 11
>> https://urldefense.com/v3/__https://inside.java/2022/12/28/jdk-networking-enhancements/__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOov-IY6MK$ 
>>
>> - Podcast: “Java Language - State of the Union”
>> https://urldefense.com/v3/__https://inside.java/2022/12/23/podcast-028/__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOompgAPG6$ 
>>
>> - Tutorial - Using Pattern Matching
>> https://urldefense.com/v3/__https://dev.java/learn/pattern-matching/__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOor7TKe-N$ 
>>
>> - 24 Java Features You Missed In 2022 - Inside Java Newscast #39
>> https://urldefense.com/v3/__https://inside.java/2022/12/15/newscast-39/__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOotlxDdE8$ 
>>
>>
>> ## January 2023 Critical Patch Update Released
>>
>> As part of the January 2023 CPU, we released JDK 19.0.2, JDK 17.0.6 
>> LTS, JDK 11.0.18 LTS and JDK 8u361 as well as OpenJDK 19.0.2.
>>
>>
>> ## Oracle JRE and JDK Cryptographic Roadmap
>>
>> The crypto roadmap [14] provides the information on Oracle's plans 
>> for changes to the security algorithms and associated 
>> policies/settings in the Oracle JRE & JDK.
>>
>> [14] 
>> https://urldefense.com/v3/__https://www.java.com/en/jre-jdk-cryptoroadmap.html__;!!ACWV5N9M2RV99hQ!LAi6L2RkPup_xGYw-5hFRhR7zo4U9xVl6bVu6xfV846FJUQtJHcGxi-J9L5TsBM_QN1e1kzkGCP6yw82eeBOoqtkTmgf$ 
>>
>> ~
>>
>> We look forward to your continued participation in 2023. And as 
>> always, if you find an issue, please let us know through the usual 
>> channels.
>>
>