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Posted to dev@zookeeper.apache.org by Enrico Olivelli <eo...@gmail.com> on 2023/02/15 11:27:58 UTC
Re: JDK 20 Rampdown Phase 2 & JMX Heads-up
Hello,
I have found a new test that doesn't pass on JDK20
https://issues.apache.org/jira/browse/ZOOKEEPER-4675
The problem is that Thread.suspend() now throws UnsupportedOperationException
Any volunteers to fix it ?
Enrico
Il giorno mer 25 gen 2023 alle ore 06:23 David Delabassee
<da...@oracle.com> ha scritto:
>
> 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://jdk.java.net/20/
> [2] https://mail.openjdk.org/pipermail/jdk-dev/2023-January/007308.html
> [3] https://jdk.java.net/21/
>
>
> ## 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://jdk.java.net/20/release-notes
>
> ### 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://jdk.java.net/21/
> [10] https://download.java.net/java/early_access/jdk21/docs/api/
>
> ### 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://github.com/openjdk/jfx
> [12] https://jdk.java.net/javafx20/
> [13] https://jdk.java.net/javafx21/
> [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://inside.java/2023/01/19/newscast-40/
>
> - 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://minborgsjavapot.blogspot.com/2023/01/java-20-almost-infinite-memory-segment.html
>
> - Podcast: “Helidon Níma & Virtual Threads”
> https://inside.java/2023/01/12/podcast-029/
>
> - From ThreadLocal to ScopedValue with Loom - JEP Café #16
> https://inside.java/2023/01/10/jepcafe16/
>
> - Java 20 - Colossal Sparse Memory Segments
> https://minborgsjavapot.blogspot.com/2023/01/java-20-colossal-sparse-memory-segments.html
>
> - Another Panama Update
> https://mail.openjdk.org/pipermail/panama-dev/2022-December/018182.html
>
> - Secure Coding Guidelines for Java SE
> https://inside.java/2023/01/04/secure-coding-guideline/
>
> - Java Networking Enhancements since JDK 11
> https://inside.java/2022/12/28/jdk-networking-enhancements/
>
> - Podcast: “Java Language - State of the Union”
> https://inside.java/2022/12/23/podcast-028/
>
> - Tutorial - Using Pattern Matching
> https://dev.java/learn/pattern-matching/
>
> - 24 Java Features You Missed In 2022 - Inside Java Newscast #39
> https://inside.java/2022/12/15/newscast-39/
>
>
> ## 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://www.java.com/en/jre-jdk-cryptoroadmap.html
>
> ~
>
> 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.
>
Re: [External] : Re: JDK 20 Rampdown Phase 2 & JMX Heads-up
Posted by David Delabassee <da...@oracle.com>.
Hi,
FYI some background on this deprecation,
https://inside.java/2022/11/09/quality-heads-up/
--David
On 15/02/2023 12:27, Enrico Olivelli wrote:
> Hello,
> I have found a new test that doesn't pass on JDK20
>
> https://urldefense.com/v3/__https://issues.apache.org/jira/browse/ZOOKEEPER-4675__;!!ACWV5N9M2RV99hQ!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu1Px_IKU8$
>
> The problem is that Thread.suspend() now throws UnsupportedOperationException
>
> Any volunteers to fix it ?
>
> Enrico
>
> Il giorno mer 25 gen 2023 alle ore 06:23 David Delabassee
> <da...@oracle.com> ha scritto:
>> 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!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu1c5ckuDk$
>> [2] https://mail.openjdk.org/pipermail/jdk-dev/2023-January/007308.html
>> [3] https://urldefense.com/v3/__https://jdk.java.net/21/__;!!ACWV5N9M2RV99hQ!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu1VyHDFow$
>>
>>
>> ## 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!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu1fn206Yw$
>>
>> ### 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!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu1VyHDFow$
>> [10] https://urldefense.com/v3/__https://download.java.net/java/early_access/jdk21/docs/api/__;!!ACWV5N9M2RV99hQ!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu1uJglVDg$
>>
>> ### 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!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu1q8cbmSU$
>> [12] https://urldefense.com/v3/__https://jdk.java.net/javafx20/__;!!ACWV5N9M2RV99hQ!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu1hTLsE5o$
>> [13] https://urldefense.com/v3/__https://jdk.java.net/javafx21/__;!!ACWV5N9M2RV99hQ!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu1qxvDB_k$
>> [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!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu1ACTLJow$
>>
>> - 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!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu1AE_4ikI$
>>
>> - Podcast: “Helidon Níma & Virtual Threads”
>> https://urldefense.com/v3/__https://inside.java/2023/01/12/podcast-029/__;!!ACWV5N9M2RV99hQ!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu1ORtCz8g$
>>
>> - From ThreadLocal to ScopedValue with Loom - JEP Café #16
>> https://urldefense.com/v3/__https://inside.java/2023/01/10/jepcafe16/__;!!ACWV5N9M2RV99hQ!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu10qvz_LI$
>>
>> - Java 20 - Colossal Sparse Memory Segments
>> https://urldefense.com/v3/__https://minborgsjavapot.blogspot.com/2023/01/java-20-colossal-sparse-memory-segments.html__;!!ACWV5N9M2RV99hQ!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu19VtfeK8$
>>
>> - 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!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu1zqGRzKI$
>>
>> - Java Networking Enhancements since JDK 11
>> https://urldefense.com/v3/__https://inside.java/2022/12/28/jdk-networking-enhancements/__;!!ACWV5N9M2RV99hQ!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu1s6Ssd_A$
>>
>> - Podcast: “Java Language - State of the Union”
>> https://urldefense.com/v3/__https://inside.java/2022/12/23/podcast-028/__;!!ACWV5N9M2RV99hQ!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu1qbrsgrE$
>>
>> - Tutorial - Using Pattern Matching
>> https://urldefense.com/v3/__https://dev.java/learn/pattern-matching/__;!!ACWV5N9M2RV99hQ!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu1pfLZ6xY$
>>
>> - 24 Java Features You Missed In 2022 - Inside Java Newscast #39
>> https://urldefense.com/v3/__https://inside.java/2022/12/15/newscast-39/__;!!ACWV5N9M2RV99hQ!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu19ptxnSc$
>>
>>
>> ## 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!IeGSoMRzMJOkF0rd7oQzR_RCd64iBsekru7Xzw4IHen6ccEXIXOFy8rq59jU_YqekJxmF05R0PEZyJu1mn1a1R4$
>>
>> ~
>>
>> 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.
>>