529 lines
18 KiB
Plaintext
529 lines
18 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 17.0.0 (2021-09-14):
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===========================================
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The full list of changes in the interim releases from 11u to 17u can be found at:
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* https://builds.shipilev.net/backports-monitor/release-notes-12.txt
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* https://builds.shipilev.net/backports-monitor/release-notes-13.txt
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* https://builds.shipilev.net/backports-monitor/release-notes-14.txt
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* https://builds.shipilev.net/backports-monitor/release-notes-15.txt
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* https://builds.shipilev.net/backports-monitor/release-notes-16.txt
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* https://builds.shipilev.net/backports-monitor/release-notes-17.txt
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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 12
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through to 17.
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NEW FEATURES
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============
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Language Features
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=================
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Switch Expressions
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==================
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https://openjdk.java.net/jeps/325
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https://openjdk.java.net/jeps/354
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https://openjdk.java.net/jeps/361
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Extend the `switch` statement so that it can be used as either a
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statement or an expression, and that both forms can use either a
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"traditional" or "simplified" scoping and control flow behavior. Both
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forms can use either traditional `case ... :` labels (with fall
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through) or new `case ... ->` labels (with no fall through), with a
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further new statement for yielding a value from a `switch`
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expression. These changes will simplify everyday coding, and also
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prepare the way for the use of pattern matching in `switch`.
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This was a preview feature (http://openjdk.java.net/jeps/12) in
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OpenJDK 12 & 13 and became final in OpenJDK 14.
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Text Blocks
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===========
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https://openjdk.java.net/jeps/355
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https://openjdk.java.net/jeps/368
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https://openjdk.java.net/jeps/378
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Add text blocks to the Java language. A text block is a multi-line
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string literal that avoids the need for most escape sequences,
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automatically formats the string in a predictable way, and gives the
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developer control over format when desired.
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This was a preview feature (http://openjdk.java.net/jeps/12) in
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OpenJDK 13 & 14 and became final in OpenJDK 15.
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Pattern Matching for instanceof
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===============================
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https://openjdk.java.net/jeps/305
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https://openjdk.java.net/jeps/375
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https://openjdk.java.net/jeps/394
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http://cr.openjdk.java.net/~briangoetz/amber/pattern-match.html
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Enhance the Java programming language with pattern matching for the
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`instanceof` operator. Pattern matching allows common logic in a
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program, namely the conditional extraction of components from objects,
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to be expressed more concisely and safely.
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This was a preview feature (http://openjdk.java.net/jeps/12) in
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OpenJDK 14 & 15 and became final in OpenJDK 16.
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Records
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=======
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https://openjdk.java.net/jeps/359
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https://openjdk.java.net/jeps/384
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https://openjdk.java.net/jeps/395
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Enhance the Java programming language with records. Records provide a
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compact syntax for declaring classes which are transparent holders for
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shallowly immutable data.
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This was a preview feature (http://openjdk.java.net/jeps/12) in
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OpenJDK 14 & 15 and became final in OpenJDK 16.
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Sealed Classes
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==============
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https://openjdk.java.net/jeps/360
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https://openjdk.java.net/jeps/397
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https://openjdk.java.net/jeps/409
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https://cr.openjdk.java.net/~briangoetz/amber/datum.html
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Enhance the Java programming language with sealed classes and
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interfaces. Sealed classes and interfaces restrict which other classes
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or interfaces may extend or implement them.
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This was a preview feature (http://openjdk.java.net/jeps/12) in
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OpenJDK 15 & 16 and became final in OpenJDK 17.
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Restore Always-Strict Floating-Point Semantics
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==============================================
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https://openjdk.java.net/jeps/306
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Make floating-point operations consistently strict, rather than have
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both strict floating-point semantics (`strictfp`) and subtly different
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default floating-point semantics. This will restore the original
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floating-point semantics to the language and VM, matching the
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semantics before the introduction of strict and default floating-point
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modes in Java SE 1.2.
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Pattern Matching for switch
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===========================
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https://openjdk.java.net/jeps/406
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Enhance the Java programming language with pattern matching for
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`switch` expressions and statements, along with extensions to the
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language of patterns. Extending pattern matching to `switch` allows an
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expression to be tested against a number of patterns, each with a
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specific action, so that complex data-oriented queries can be
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expressed concisely and safely.
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This is a preview feature (http://openjdk.java.net/jeps/12) in OpenJDK
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17.
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Library Features
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================
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JVM Constants API
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=================
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https://openjdk.java.net/jeps/334
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Introduce an API to model nominal descriptions of key class-file and
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run-time artifacts, in particular constants that are loadable from the
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constant pool.
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Reimplement the Legacy Socket API
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=================================
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https://openjdk.java.net/jeps/353
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Replace the underlying implementation used by the `java.net.Socket`
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and `java.net.ServerSocket` APIs with a simpler and more modern
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implementation that is easy to maintain and debug. The new
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implementation will be easy to adapt to work with user-mode threads,
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a.k.a. fibers, currently being explored in Project Loom
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(https://openjdk.java.net/projects/loom).
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JFR Event Streaming
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===================
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https://openjdk.java.net/jeps/349
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Expose JDK Flight Recorder data for continuous monitoring.
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Non-Volatile Mapped Byte Buffers
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================================
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https://openjdk.java.net/jeps/352
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Add new JDK-specific file mapping modes so that the `FileChannel` API
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can be used to create `MappedByteBuffer` instances that refer to
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non-volatile memory.
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Helpful NullPointerExceptions
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=============================
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https://openjdk.java.net/jeps/358
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Improve the usability of `NullPointerException`s generated by the JVM
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by describing precisely which variable was `null`.
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Foreign-Memory Access API
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=========================
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https://openjdk.java.net/jeps/370
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https://openjdk.java.net/jeps/383
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https://openjdk.java.net/jeps/393
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Introduce an API to allow Java programs to safely and efficiently
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access foreign memory outside of the Java heap.
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This was a incubation feature (https://openjdk.java.net/jeps/11) in
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OpenJDK 14, 15 & 16, now superseded by the Foreign Function & Memory
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API in OpenJDK 17 (see below).
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Edwards-Curve Digital Signature Algorithm (EdDSA)
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=================================================
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https://openjdk.java.net/jeps/339
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Implement cryptographic signatures using the Edwards-Curve Digital
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Signature Algorithm (EdDSA) as described by RFC 8032
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(https://tools.ietf.org/html/rfc8032).
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Hidden Classes
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==============
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https://openjdk.java.net/jeps/371
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Introduce hidden classes, which are classes that cannot be used
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directly by the bytecode of other classes. Hidden classes are intended
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for use by frameworks that generate classes at run time and use them
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indirectly, via reflection. A hidden class may be defined as a member
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of an access control nest (https://openjdk.java.net/jeps/181), and may
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be unloaded independently of other classes.
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Reimplement the Legacy DatagramSocket API
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=========================================
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https://openjdk.java.net/jeps/373
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Replace the underlying implementations of the
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`java.net.DatagramSocket` and `java.net.MulticastSocket` APIs with
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simpler and more modern implementations that are easy to maintain and
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debug. The new implementations will be easy to adapt to work with
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virtual threads, currently being explored in Project Loom
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(https://openjdk.java.net/projects/loom). This is a follow-on to JEP
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353 (see above), which already reimplemented the legacy Socket API.
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Vector API
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==========
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https://openjdk.java.net/jeps/338
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https://openjdk.java.net/jeps/414
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Provide an initial iteration of an incubator module,
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`jdk.incubator.vector`, to express vector computations that reliably
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compile at runtime to optimal vector hardware instructions on
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supported CPU architectures and thus achieve superior performance to
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equivalent 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.
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Unix-Domain Socket Channels
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===========================
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https://openjdk.java.net/jeps/380
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Add Unix-domain (`AF_UNIX`) socket support to the socket channel and
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server-socket channel APIs in the `java.nio.channels` package. Extend
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the inherited channel mechanism to support Unix-domain socket channels
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and server socket channels.
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Foreign Linker API (Incubator)
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==============================
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https://openjdk.java.net/jeps/389
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Introduce an API that offers statically-typed, pure-Java access to
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native code. This API, together with the Foreign-Memory API (see
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above), will considerably simplify the otherwise error-prone process
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of binding to a native library.
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This was an incubation feature (https://openjdk.java.net/jeps/11)
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introduced in OpenJDK 16, now superseded by the Foreign Function &
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Memory API in OpenJDK 17 (see below).
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Strongly Encapsulate JDK Internals by Default
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=============================================
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https://openjdk.java.net/jeps/396
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https://openjdk.java.net/jeps/403
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Strongly encapsulate all internal elements of the JDK by default,
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except for critical internal APIs such as `sun.misc.Unsafe`. It will
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no longer be possible to relax the strong encapsulation of internal
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elements via a single command-line option, as was possible in OpenJDK
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9 through 16.
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Enhanced Pseudo-Random Number Generators
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========================================
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https://openjdk.java.net/jeps/356
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Provide new interface types and implementations for pseudo-random
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number generators (PRNGs), including jumpable PRNGs and an additional
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class of splittable PRNG algorithms (LXM).
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Foreign Function & Memory API
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=============================
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https://openjdk.java.net/jeps/412
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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 an incubation feature (https://openjdk.java.net/jeps/11)
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introduced in OpenJDK 17, and is an evolution of the Foreign Memory
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Access API (OpenJDK 14 through 16) and Foreign Linker API (OpenJDK
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16) (see above).
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Context-Specific Deserialization Filters
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========================================
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https://openjdk.java.net/jeps/415
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Allow applications to configure context-specific and
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dynamically-selected deserialization filters via a JVM-wide filter
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factory that is invoked to select a filter for each individual
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deserialization operation.
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Tools
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=====
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Packaging Tool
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==============
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https://openjdk.java.net/jeps/343
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https://openjdk.java.net/jeps/392
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Provide the `jpackage` tool, for packaging self-contained Java
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applications.
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JVM Features
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============
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Shenandoah: A Low-Pause-Time Garbage Collector
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==============================================
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https://openjdk.java.net/jeps/189
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https://openjdk.java.net/jeps/379
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Add a new garbage collection (GC) algorithm named Shenandoah which
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reduces GC pause times by doing evacuation work concurrently with the
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running Java threads. Pause times with Shenandoah are independent of
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heap size, meaning you will have the same consistent pause times
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whether your heap is 200 MB or 200 GB.
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Shenandoah has been provided in Red Hat builds of OpenJDK 8 since
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8u131 in April 2017 and in all 11u builds.
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Upstream, it was introduced in OpenJDK 12 as an experimental feature
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and became a production feature in OpenJDK 15. It was backported to
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OpenJDK 11 with the 11.0.9 release in October 2020.
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Abortable Mixed Collections for G1
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==================================
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https://openjdk.java.net/jeps/344
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Make G1 mixed collections abortable if they might exceed the pause
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target.
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Promptly Return Unused Committed Memory from G1
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===============================================
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https://openjdk.java.net/jeps/346
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Enhance the G1 garbage collector to automatically return Java heap
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memory to the operating system when idle.
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Dynamic CDS Archives
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====================
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https://openjdk.java.net/jeps/310
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https://openjdk.java.net/jeps/350
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Extend application class-data sharing to allow the dynamic archiving
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of classes at the end of Java application execution. The archived
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classes will include all loaded application classes and library
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classes that are not present in the default, base-layer CDS archive.
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ZGC: Uncommit Unused Memory (Experimental)
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==========================================
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https://openjdk.java.net/jeps/351
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Enhance ZGC to return unused heap memory to the operating system.
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NUMA-Aware Memory Allocation for G1
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===================================
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https://openjdk.java.net/jeps/345
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Improve G1 performance on large machines by implementing NUMA-aware
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memory allocation.
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ZGC on macOS (Experimental)
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===========================
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https://openjdk.java.net/jeps/364
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Port the ZGC garbage collector to macOS.
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ZGC on Windows (Experimental)
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=============================
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https://openjdk.java.net/jeps/365
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Port the ZGC garbage collector to Windows.
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ZGC: A Scalable Low-Latency Garbage Collector (Production)
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==========================================================
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https://openjdk.java.net/jeps/377
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Change the Z Garbage Collector from an experimental feature into a
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product feature.
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ZGC: Concurrent Thread-Stack Processing
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=======================================
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https://openjdk.java.net/jeps/376
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Move ZGC thread-stack processing from safepoints to a concurrent
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phase.
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Elastic Metaspace
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=================
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https://openjdk.java.net/jeps/387
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Return unused HotSpot class-metadata (i.e., metaspace) memory to the
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operating system more promptly, reduce metaspace footprint, and
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simplify the metaspace code in order to reduce maintenance costs.
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Ports
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=====
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Alpine Linux Port
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=================
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https://openjdk.java.net/jeps/386
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Port the JDK to Alpine Linux, and to other Linux distributions that
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use musl as their primary C library, on both the x64 and AArch64
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architectures,
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Windows/AArch64 Port
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====================
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https://openjdk.java.net/jeps/388
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Port the JDK to Windows/AArch64.
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New macOS Rendering Pipeline
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============================
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https://openjdk.java.net/jeps/382
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Implement a Java 2D internal rendering pipeline for macOS using the
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Apple Metal API as alternative to the existing pipeline, which uses
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the deprecated Apple OpenGL API.
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macOS/AArch64 Port
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==================
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https://openjdk.java.net/jeps/391
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Port the JDK to macOS/AArch64.
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DEPRECATIONS
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============
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Deprecate the ParallelScavenge + SerialOld GC Combination
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=========================================================
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https://openjdk.java.net/jeps/366
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Deprecate the combination of the Parallel Scavenge and Serial Old
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garbage collection algorithms.
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Deprecate and Disable Biased Locking
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====================================
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https://openjdk.java.net/jeps/374
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Disable biased locking by default, and deprecate all related
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command-line options.
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Warnings for Value-Based Classes
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================================
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https://openjdk.java.net/jeps/390
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Designate the primitive wrapper classes as value-based and deprecate
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their constructors for removal, prompting new deprecation
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warnings. Provide warnings about improper attempts to synchronize on
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instances of any value-based classes in the Java Platform.
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Deprecate the Applet API for Removal
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====================================
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https://openjdk.java.net/jeps/398
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Deprecate the Applet API for removal. It is essentially irrelevant
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since all web-browser vendors have either removed support for Java
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browser plug-ins or announced plans to do so.
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Deprecate the Security Manager for Removal
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==========================================
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https://openjdk.java.net/jeps/411
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Deprecate the Security Manager for removal in a future release. The
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Security Manager dates from Java 1.0. It has not been the primary
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means of securing client-side Java code for many years, and it has
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rarely been used to secure server-side code. To move Java forward, we
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intend to deprecate the Security Manager for removal in concert with
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the legacy Applet API (see above). .
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REMOVALS
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========
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Remove the Concurrent Mark Sweep (CMS) Garbage Collector
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========================================================
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https://openjdk.java.net/jeps/363
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Remove the Concurrent Mark Sweep (CMS) garbage collector.
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Remove the Pack200 Tools and API
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================================
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https://openjdk.java.net/jeps/336
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https://openjdk.java.net/jeps/367
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Remove the `pack200` and `unpack200` tools, and the `Pack200` API in
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the `java.util.jar` package. These tools and API were deprecated for
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removal in OpenJDK 11 with the express intent to remove them in a
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future release.
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Remove the Nashorn JavaScript Engine
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====================================
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https://openjdk.java.net/jeps/372
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|
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Remove the Nashorn JavaScript script engine and APIs, and the `jjs`
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tool. The engine, the APIs, and the tool were deprecated for removal
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in OpenJDK 11 with the express intent to remove them in a future
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release.
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Remove the Solaris and SPARC Ports
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==================================
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https://openjdk.java.net/jeps/362
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https://openjdk.java.net/jeps/381
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Remove the source code and build support for the Solaris/SPARC,
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Solaris/x64, and Linux/SPARC ports. These ports were deprecated for
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|
removal in OpenJDK 14 (JEP 362) and removed in OpenJDK 15 (JEP 381).
|
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Remove RMI Activation
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=====================
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https://openjdk.java.net/jeps/385
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https://openjdk.java.net/jeps/407
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https://docs.oracle.com/en/java/javase/14/docs/specs/rmi/activation.html
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Remove the Remote Method Invocation (RMI) Activation mechanism, while
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preserving the rest of RMI. RMI Activation is an obsolete part of RMI
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that has been optional since OpenJDK 8 and was deprecated in OpenJDK
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15.
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Remove the Experimental AOT and JIT Compiler
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============================================
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https://openjdk.java.net/jeps/410
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Remove the experimental Java-based ahead-of-time (AOT) and
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just-in-time (JIT) compiler. This compiler has seen little use since
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its introduction and the effort required to maintain it is
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significant. Retain the experimental Java-level JVM compiler
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interface (JVMCI) so that developers can continue to use
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externally-built versions of the compiler for JIT compilation.
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