JDK 19 first Release Candidates!

David Delabassee david.delabassee at oracle.com
Mon Aug 22 14:13:50 UTC 2022


I hope you had a chance to take some time off. On our side, and despite 
the summer vacation, everything is on track for the Java 19 GA release 
on September 20th with JDK 19 now in the Release Candidate Phase [1]. If 
you haven't done so yet, it is time to start testing your project(s) 
using JDK 20 Early-Access builds. Speaking of Early-Access builds, there 
is now a new set of EA builds, i.e., the jextract EA builds. jextract is 
a tool developed under the Project Panama umbrella whose goal is to 
mechanically generates Java bindings from native library headers. If you 
are using the Foreign Function & Memory API (Preview Feature in JDK 19), 
make sure to check jextract too (see the jextract section below).

[1] https://mail.openjdk.org/pipermail/jdk-dev/2022-August/006861.html

## Heads-up - New system properties for `System.out` and `System.err` in 
JDK 19

Two new system properties, `stdout.encoding` and `stderr.encoding`, have 
been introduced. The value of these system properties is the encoding 
used by the standard output (`System.out`) and standard error 
(`System.err`) streams. The default values of these system properties 
depend on the platform. The values take on the value of the 
`native.encoding` property when the platform does not provide streams 
for the console. The properties can be overridden on the launcher's 
command line option, with `-D`, to set them to UTF-8 where required. For 
more details see https://bugs.openjdk.org/browse/JDK-8283620

## Heads-up - SSLSocketImpl finalizer implementation removed in JDK 19

The finalizer implementation in SSLSocket has been removed, with the 
underlying native resource releases now done by the Socket 
implementation. With this update, the TLS close_notify messages will no 
longer be emitted if SSLSocket is not explicitly closed. Not closing 
Sockets properly is an error condition that should be avoided. 
Applications should always close sockets and not rely on garbage 
collection. For more details see https://bugs.openjdk.org/browse/JDK-8212136

## Heads-up - New providerPath jarsigner option in JDK 19

A new `-providerPath` option has been added to the jarsigner. This 
option is used to specify the class path of an alternate keystore 
implementation, it can be used together with the -providerClass option. 
For more details see https://bugs.openjdk.org/browse/JDK-8281175

## JDK 19 Release Candidate builds

JDK 19 first Release Candidates (builds 36) are now available [2], and 
are provided under the GNU General Public License v2, with the Classpath 
Exception. The Release Notes are available here [3].

[2] https://jdk.java.net/19/
[3] https://jdk.java.net/19/release-notes

## JDK 20 Early-Access builds

JDK 20 Early-Access builds 11 are now available [4], and are provided 
under the GNU General Public License v2, with the Classpath Exception. 
The Release Notes are available here [5].

[4] https://jdk.java.net/20/
[5] https://jdk.java.net/20/release-notes

### Recent changes that maybe of interest:

- JDK-8282730: LdapLoginModule throw NPE from logout method after login 
- JDK-8290706: Remove the support for inline contiguous allocations
- JDK-8289551: Conversions between bit representations of half precision 
values and floats
- JDK-8290485: [vector] REVERSE_BYTES for byte type should not emit any 
- JDK-8289137: Automatically adapt Young/OldPLABSize and when setting 
only MinTLABSize
- JDK-8290034: Auto vectorize reverse bit operations.
- JDK-8290868: NMT: MallocSiteTable statistics improvements
- JDK-8291822: ARM32: Build errors with GCC 11 in 
frame::saved_oop_result [Reported by JaCoCo]
- JDK-8289249: Add methods to Elements for record constructors
- JDK-8283232: x86: Improve vector broadcast operations
- JDK-8288327: Executable.hasRealParameterData should not be volatile
- JDK-8291360: Create entry points to expose low-level class file 
- JDK-8290840: Refactor the "os" class
- JDK-8292327: InflaterInputStream.read throws EOFException
- JDK-8155246: Throw error if default java.security file is missing
- JDK-8289332: Auto-generate ids for user-defined headings
- JDK-8292153: x86: Represent Registers as values

## Jextract Early-Access Builds

Early Access Builds 19-jextract+2-3 (2022/7/19) are now available [6]. 
These open-source builds are provided under the GNU General Public 
License, version 2, with the Classpath Exception.

These builds are from the OpenJDK jextract project [7] which is part of 
Code Tools [8]. jextract is a tool developed under the Panama umbrealla 
whose goal is to mechanically generate Java bindings from native library 
headers. These EA builds are intended for advanced users, and are 
provided as a convenience so that they don't need to build it from the 
sources. Additional notes on builds, documentation and known issues are 
available at [6].

Please subscribe to the jextract mailing list [9] to share feedback.

[6] https://jdk.java.net/jextract/
[7] https://github.com/openjdk/jextract
[8] https://openjdk.org/projects/code-tools/
[9] http://mail.openjdk.org/mailman/listinfo/jextract-dev

## Topics of Interest

* Podcast: “JavaOne is Back!”

* Sequenced Collections, Purity, and more at JavaOne

* Concurrent Marking in G1

* Java Asynchronous Programming Full Tutorial with Loom and Structured 
Concurrency - JEP Café

* New candidate JEP: 429: Extent-Local Variables (Incubator)

## JDK Update Patch Release

To fix a regression (JDK-8292260) in the C2 JIT compiler, we have 
produced update patch releases for the impacted supported Java SE 
versions. The new versions are JDK (publicly available), (publicly available),, and OpenJDK 
(publicly available).

As usual, let us know if you find any issues while testing your 
project(s) on the latest JDK early-access builds. Thanks for your support!


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