15

Java 15 Release Notes Documentation

Release Notes

New Features and Enhancements

core-libs/java.lang

Added isEmpty Default Method to CharSequence

core-libs/java.lang

Support for Unicode 13.0

core-libs/java.lang.invoke

JEP 371 Hidden Classes

core-libs/java.net

Added Support for SO_INCOMING_NAPI_ID Support

core-libs/java.util:collections

Specialized Implementations of TreeMap Methods

core-svc/javax.management

Added Ability to Configure Third Port for Remote JMX

core-svc/tools

New Option Added to jstatd for Specifying RMI Connector Port Number

New Option Added to jcmd for Writing a gzipped Heap Dump

tools/javac

JEP 378 Text Blocks

hotspot/svc-agent

New Options Added to jhsdb for debugd Mode

install/install

Oracle JDK Installer for Windows Provides Executables (javac, etc) in a Path Reachable From Any Command Prompt

security-libs/java.security

Added Revocation Checking to jarsigner

Tools Warn If Weak Algorithms Are Used

security-libs/javax.crypto

SunJCE Provider Supports SHA-3 Based Hmac Algorithms

security-libs/javax.net.ssl

New System Properties to Configure the TLS Signature Schemes

Support for certificate_authorities Extension

security-libs/org.ietf.jgss:krb5

Support for canonicalize in krb5.conf

Support cross-realm MSSFU

Removed Features and Options

core-libs/java.net

Removal of Terminally Deprecated Solaris-specific SO_FLOW_SLA Socket Option

core-libs/java.rmi

Removal of RMI Static Stub Compiler (rmic)

core-svc/javax.management

Removal of Deprecated Constant RMIConnectorServer.CREDENTIAL_TYPES

core-libs/jdk.nashorn

Removal of Nashorn JavaScript Engine

hotspot/gc

Obsolete -XXUseAdaptiveGCBoundary

security-libs/java.security

Removal of Comodo Root CA Certificate

Removal of DocuSign Root CA Certificate

security-libs/javax.net.ssl

Retired the Deprecated SSLSession.getPeerCertificateChain() Method Implementation

Removal of com.sun.net.ssl.internal.ssl.Provider Name

Deprecated Features and Options

core-libs/java.rmi

Deprecated RMI Activation for Removal

docs

Deprecated NSWindowStyleMaskTexturedBackground

hotspot/gc

Deprecated -XXForceNUMA Option

hotspot/runtime

Disabled Biased-locking and Deprecated Biased-locking Flags

security-libs/javax.crypto

Disabled Native SunEC Implementation by Default

security-libs/jdk.security

Added forRemoval=true to Previously Deprecated ContentSigner APIs

Other notes

client-libs

Workaround for Windows GDI API's memory restrictions

client-libs/java.awt

java.awt.Robot.delay() Method Completes With Interrupt Status Set When Interrupted

core-libs/java.io:serialization

Improved Serialization Handling

core-libs/java.lang

Optimized Empty Substring Handling

core-libs/java.lang.invoke

LookupdefineClass Links the Class

core-libs/java.net

DatagramSocketdisconnect Allows an Implementation to Throw UncheckedIOException

java.net.HttpClient Does Not Override Protocols Specified in SSLContext Default Parameters

Filtering and Ordering of Addresses Returned by Alternative Hosts File Name Service Provider

DatagramPacket.getPort() Returns 0 When the Port Is Not Set

core-libs/java.nio.charsets

Modified the MS950 charset Encoder's Conversion Table

core-libs/java.text

Support Monetary Grouping Separator in DecimalFormat/DecimalFormatSymbols

core-libs/java.time

localizedBy() Overrides Localized Values With Default Values

ValueRange.of(long, long, long) Does Not Throw IAE on Invalid Inputs

core-libs/java.util.jar

Performance Improvement for InflaterOutputStream.write

core-libs/java.util.regex

Incorrect behavior matching Unicode linebreaks

Case Insensitive Matching Doesn't Work Correctly for Some Character Classes

core-libs/java.util:collections

Better Listing of Arrays

TreeMap.computeIfAbsent Mishandles Existing Entries Whose Values Are null

core-libs/java.util:i18n

Support for CLDR version 37

Localized Time Zone Name Inconsistency Between English and Other Locales

tools/jpackage

[macos] Support for Notarizing jpackage app-image and dmg

hotspot/compiler

Flags Controlling C1 Inlining Have New Name

hotspot/gc

Improved Ergonomics for G1 Heap Region Size

JEP 377 ZGC A Scalable Low-Latency Garbage Collector (Production)

Disabling large pages on Windows

Disabling NUMA Interleaving on Windows

hotspot/runtime

Field Layout Computation Changed

Enable ShowCodeDetailsInExceptionMessages by default

security-libs/java.security

Signature and SignatureSpi Get Parameter Methods May Return null When Unsupported

security-libs/javax.crypto:pkcs11

SunPKCS11 Initialization With NSS When External FIPS Modules Are in Security Modules Database

security-libs/javax.net.ssl

Default SSLEngine Should Create in Server Role

tools/javac

JEP 375 Pattern Matching for instanceof (Second Preview)

tools/javadoc(tool)

Standard Doclet Index Files Compression