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Java 16 Release Notes Documentation

Release Notes

New Features and Enhancements

core-libs

JEP 389: Foreign Linker API (Incubator)

JEP 396: Strongly Encapsulate JDK Internals by Default

JEP 393: Foreign-Memory Access API (Third Incubator)

JEP 390: Warnings for Value-based Classes

core-libs/java.lang:reflect

Add InvocationHandler::invokeDefault Method for Proxy's Default Method Support

core-libs/java.nio

Day Period Support Added to `java.time` Formats

A new formatter pattern, letter 'B', and its supporting method have been added to java.time.format.DateTimeFormatter/DateTimeFormatterBuilder classes. Example:

DateTimeFormatter.ofPattern("yyyy-MM-dd hh:mm B")
                 .format(LocalDateTime.of(2022, 6, 21, 17, 42)); // "2022-06-21 05:42 in the afternoon"

core-libs/java.util.stream

JEP 338: Vector API (Incubator)

JEP 376: ZGC Concurrent Stack Processing

Concurrently Uncommit Memory in G1

hotspot/jfr

New jdk.ObjectAllocationSample Event Enabled by Default

hotspot/runtime

Signed JAR Support for RSASSA-PSS and EdDSA

SUN, SunRsaSign, and SunEC Providers Supports SHA-3 Based Signature Algorithms

jarsigner Preserves POSIX File Permission and symlink Attributes

Added `-trustcacerts` and `-keystore` Options to `keytool -printcert` and `-printcrl` Commands

security-libs/javax.crypto

SunPKCS11 Provider Supports SHA-3 Related Algorithms

security-libs/javax.net.ssl

Improve Certificate Chain Handling

Improve Encoding of TLS Application-Layer Protocol Negotiation (ALPN) Values

TLS Support for the EdDSA Signature Algorithm

tools/javac

JEP 397: Sealed Classes (Second Preview)

JEP 394: Pattern Matching for `instanceof`

tools/jpackage

Removed Features and Options

client-libs/java.awt

Removal of Experimental Features AOT and Graal JIT

hotspot/runtime

Deprecated Tracing Flags Are Obsolete and Must Be Replaced With Unified Logging Equivalents

Obsoleted Option	Unified Logging Replacement
`-XX:+TraceClassLoading`	`-Xlog:class+load=info`
`-XX:+TraceClassUnloading`	`-Xlog:class+unload=info`
`-XX:+TraceExceptions`	`-Xlog:exceptions=info`

security-libs/java.security

Removed Root Certificates with 1024-bit Keys

security-libs/javax.crypto

Removal of Legacy Elliptic Curves

Deprecated Features and Options

core-libs/java.lang

Terminally Deprecated ThreadGroup stop, destroy, isDestroyed, setDaemon and isDaemon

hotspot/runtime

Parts of the Signal-Chaining API Are Deprecated

security-libs/java.security

Deprecated the `java.security.cert` APIs That Represent DNs as Principal or String Objects

Other notes

core-libs/java.io

Line Terminator Definition Changed in java.io.LineNumberReader

core-libs/java.io:serialization

Enhanced Support of Proxy Class

core-libs/java.lang

Support Supplementary Characters in String Case Insensitive Operations

For example, "\ud801\udc00".equalsIgnoreCase("\ud801\udc28") returns true,

because '𐐀' ("\ud801\udc00") and '𐐨' ("\ud801\udc28") are equal to each other character in case-insensitive comparison.

Module::getPackages Returns the Set of Package Names in This Module

core-libs/java.lang:reflect

Proxy Classes Are Not Open for Reflective Access

core-libs/java.net

The Default `HttpClient` Implementation Returns Cancelable Futures

`HttpClient.newHttpClient` and `HttpClient.Builder.build` Might Throw `UncheckedIOException`

HttpPrincipal::getName Returned Incorrect Name

The behavior of the HttpPrincipal::getName method has been updated to return the name in the correct format as outlined in its specification, i.e. "realm:username". Previously, the method incorrectly returned "username" only.

core-libs/java.nio

Incomplete Support for Unix Domain Sockets in Windows 2019 Server

(fs) NullPointerException Not Thrown When First Argument to Path.of or Paths.get Is null

DataInputStream:readFully now correctly throws specified exceptions

core-libs/java.time

US/Pacific-New Zone Name Removed as Part of tzdata2020b

Information regarding this update can be viewed at Information regarding this update can be viewed at https://mm.icann.org/pipermail/tz-announce/2020-October/000059.html

core-libs/java.util