82db2fdb6f
- Update release notes with features of JDK 22 - Remove 21u FIPS patch and disable use until we are ready for the 25 version Related: RHEL-100678
204 lines
7.1 KiB
Plaintext
204 lines
7.1 KiB
Plaintext
Key:
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JDK-X - https://bugs.openjdk.java.net/browse/JDK-X
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CVE-XXXX-YYYY: https://cve.mitre.org/cgi-bin/cvename.cgi?name=XXXX-YYYY
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New in release OpenJDK 22.0.0 (2024-03-19):
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===========================================
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Major changes are listed below. Some changes may have been backported
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to earlier releases following their first appearance in OpenJDK 22
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through to 25.
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NEW FEATURES
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============
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Language Features
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=================
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Statements before super(...)
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============================
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https://openjdk.org/jeps/447
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In constructors in the Java programming language, allow statements
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that do not reference the instance being created to appear before an
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explicit constructor invocation (i.e. super()).
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This is a preview language feature (http://openjdk.java.net/jeps/12)
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introduced in OpenJDK 22 (JEP 447).
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Unnamed Patterns and Variables
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==============================
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https://openjdk.org/jeps/443
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https://openjdk.org/jeps/456
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Enhance the Java language with unnamed patterns, which match a record
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component without stating the component's name or type, and unnamed
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variables, which can be initialized but not used. Both are denoted by
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an underscore character, _.
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This feature is now final. It was a preview feature
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(http://openjdk.java.net/jeps/12) in OpenJDK 21 (JEP 443).
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String Templates
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================
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https://openjdk.org/jeps/430
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https://openjdk.org/jeps/459
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Enhance the Java programming language with string templates. String
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templates complement Java's existing string literals and text blocks
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by coupling literal text with embedded expressions and template
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processors to produce specialized results.
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This is a preview feature (http://openjdk.java.net/jeps/12) introduced
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in OpenJDK 21 (JEP 430) and reaching its second preview in OpenJDK 22
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(JEP 459).
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Library Features
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================
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Foreign Function & Memory API
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=============================
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https://openjdk.org/jeps/412
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https://openjdk.org/jeps/419
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https://openjdk.org/jeps/424
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https://openjdk.org/jeps/434
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https://openjdk.org/jeps/442
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https://openjdk.org/jeps/454
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Introduce an API by which Java programs can interoperate with code and
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data outside of the Java runtime. By efficiently invoking foreign
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functions (i.e., code outside the JVM), and by safely accessing
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foreign memory (i.e., memory not managed by the JVM), the API enables
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Java programs to call native libraries and process native data without
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the brittleness and danger of JNI.
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This API is now finalised. It was first introduced in incubation
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(https://openjdk.java.net/jeps/11) in OpenJDK 17 (JEP 412), and is an
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evolution of the Foreign Memory Access API (OpenJDK 14 through 16) and
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Foreign Linker API (OpenJDK 16) (see release notes for
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java-17-openjdk). OpenJDK 18 saw a second round of incubation (JEP
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419) before its inclusion as a preview feature
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(http://openjdk.java.net/jeps/12) in OpenJDK 19 (JEP 424). A second
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preview took place in OpenJDK 20 (JEP 434) and a third and final
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preview in OpenJDK 21 (JEP 442).
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Class-File API
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==============
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https://openjdk.org/jeps/457
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Provide a standard API for parsing, generating, and transforming Java
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class files.
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This is a preview library feature (http://openjdk.java.net/jeps/12)
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introduced in OpenJDK 22 (JEP 457).
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Vector API
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==========
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https://openjdk.org/jeps/338
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https://openjdk.org/jeps/414
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https://openjdk.org/jeps/417
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https://openjdk.org/jeps/426
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https://openjdk.org/jeps/438
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https://openjdk.org/jeps/448
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https://openjdk.org/jeps/460
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Introduce an API to express vector computations that reliably compile
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at runtime to optimal vector hardware instructions on supported CPU
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architectures and thus achieve superior performance to equivalent
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scalar computations.
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This is an incubation feature (https://openjdk.java.net/jeps/11)
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introduced in OpenJDK 16 (JEP 338). A second round of incubation took
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place in OpenJDK 17 (JEP 414), OpenJDK 18 (JEP 417) saw a third,
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OpenJDK 19 a fourth (JEP 426), OpenJDK 20 (JEP 438) a fifth, OpenJDK
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21 a sixth (JEP 448) and it reaches its seventh in OpenJDK 22 (JEP
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460).
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Stream Gatherers
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================
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https://openjdk.org/jeps/461
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Enhance the Stream API to support custom intermediate operations. This
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will allow stream pipelines to transform data in ways that are not
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easily achievable with the existing built-in intermediate operations.
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This is a preview library feature (http://openjdk.java.net/jeps/12)
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introduced in OpenJDK 22 (JEP 461).
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Structured Concurrency
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======================
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https://openjdk.org/jeps/428
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https://openjdk.org/jeps/437
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https://openjdk.org/jeps/453
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https://openjdk.org/jeps/462
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Simplify multithreaded programming by introducing an API for
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structured concurrency. Structured concurrency treats multiple tasks
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running in different threads as a single unit of work, thereby
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streamlining error handling and cancellation, improving reliability,
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and enhancing observability.
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This API was first introduced in incubation
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(https://openjdk.java.net/jeps/11) in OpenJDK 19 (JEP 428) and had a
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second round of incubation in OpenJDK 20 (JEP 437). It became a
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preview feature (http://openjdk.java.net/jeps/12) in OpenJDK 21 (JEP
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453) and reaches its second preview in OpenJDK 22 (JEP 462).
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Implicitly Declared Classes and Instance Main Methods
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=====================================================
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https://openjdk.org/jeps/445
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https://openjdk.org/jeps/463
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Evolve the Java language so that students can write their first
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programs without needing to understand language features designed for
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large programs. Far from using a separate dialect of Java, students
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can write streamlined declarations for single-class programs and then
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seamlessly expand their programs to use more advanced features as
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their skills grow.
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This library feature was introduced as a preview
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(http://openjdk.java.net/jeps/12) in OpenJDK 21 (JEP 445) under the
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name "Unnamed Classes and Instance Main Methods". It reaches a second
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preview in OpenJDK 22 (JEP 463) under a new name, due to the move away
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from unnamed classes to an implicitly declared name chosen by the host
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system.
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Scoped Values
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=============
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https://openjdk.org/jeps/429
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https://openjdk.org/jeps/446
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https://openjdk.org/jeps/464
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Introduce scoped values, which enable the sharing of immutable data
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within and across threads. They are preferred to thread-local
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variables, especially when using large numbers of virtual threads.
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This API was first introduced in incubation
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(https://openjdk.java.net/jeps/11) in OpenJDK 20 (JEP 429). It became a
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preview feature (http://openjdk.java.net/jeps/12) in OpenJDK 21 (JEP
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446) and reaches its second preview in OpenJDK 22 (JEP 464).
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Virtual Machine Enhancements
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============================
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Region Pinning for G1
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=====================
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https://openjdk.org/jeps/423
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Reduce latency by implementing region pinning in G1, so that garbage
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collection need not be disabled during Java Native Interface (JNI)
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critical regions.
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Tools
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=====
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Launch Multi-File Source-Code Programs
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======================================
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https://openjdk.org/jeps/458
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Enhance the java application launcher to be able to run a program
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supplied as multiple files of Java source code. This will make the
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transition from small programs to larger ones more gradual, enabling
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developers to choose whether and when to go to the trouble of
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configuring a build tool.
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