18

Java 18 Release Notes Documentation

Release Notes

New Features and Enhancements

core-libs/java.nio.charsets

JEP 400: UTF-8 by Default

core-libs/java.net

JEP 408: Simple Web Server

core-libs/java.lang:reflect

JEP 416: Reimplement Core Reflection With Method Handles

core-libs/java.net

JEP 418: Internet-Address Resolution SPI

JEPs for Tool improvements:

tools/javadoc(tool)

JEP 413: Code Snippets in Java API Documentation

JEPs for Previews and Incubators:

core-libs

JEP 417: Vector API (Third Incubator)

JEP 419: Foreign Function & Memory API (Second Incubator)

specification/language

JEP 420: Pattern Matching for switch (Second Preview)

hotspot/gc

ZGC Supports String Deduplication

SerialGC Supports String Deduplication

ParallelGC Supports String Deduplication

tools/javac

Passing Originating Elements From Filer to JavaFileManager

core-libs/java.nio.charsets

Charset.forName() Taking fallback Default Value

core-libs/java.util

New System Property to Control the Default Date Comment Written Out by java.util.Properties::store Methods

core-libs/javax.annotation.processing

printError, printWarning, and printNote methods on Messager

core-libs/javax.lang.model

Method to Get Outermost Type Element

Map from an Element to its JavaFileObject

Mapping between SourceVersion and Runtime.Version

hotspot/compiler

Improve Compilation Replay

hotspot/gc

Configurable Card Table Card Size

Allow G1 Heap Regions up to 512MB

hotspot/jfr

JDK Flight Recorder Event for Finalization

security-libs

SunPKCS11 Provider Now Supports Some PKCS#11 v3.0 APIs

security-libs/java.security

Alternate Subject.getSubject and doAs APIs Created That Do Not Depend on Security Manager APIs

KeyStore Has a getAttributes Method

Support for RSASSA-PSS in OCSP Response

New Option -version Added to keytool and jarsigner Commands

Migrate cacerts From JKS to Password-Less PKCS12

Allow Store Password to Be Null When Saving a PKCS12 KeyStore

security-libs/javax.crypto:pkcs11

SunPKCS11 Provider Supports AES Cipher With KW and KWP Modes if Supported by PKCS11 Library

tools/javac

Expand checks of javac's serial lint warning

tools/javadoc(tool)

Options to Include Script Files in Generated Documentation

@SuppressWarnings for DocLint Messages

Removed Features and Options

security-libs/java.security

Removal of IdenTrust Root Certificate

Removal of Google's GlobalSign Root Certificate

client-libs/2d

Removal of Empty finalize() Methods in java.desktop Module

core-libs/java.net

Removal of Support for Pre JDK 1.4 DatagramSocketImpl Implementations

Removal of impl.prefix JDK System Property Usage From InetAddress

Removal of Legacy PlainSocketImpl and PlainDatagramSocketImpl Implementations

security-libs/org.ietf.jgss:krb5

Removal of default_checksum and safe_checksum_type From krb5.conf

Deprecated Features and Options

JEPs for Deprecation and Removals:

core-libs/java.lang

JEP 421: Deprecated Finalization for Removal

security-libs/javax.security

Deprecated Subject::doAs for Removal

core-libs

Deprecated sun.misc.Unsafe Methods That Return Offsets

core-libs/java.lang

Terminally Deprecated Thread.stop

hotspot/gc

Obsoleted Product Options -XX:G1RSetRegionEntries and -XX:G1RSetSparseRegionEntries

Other notes

install/install

Extended Delay Before JDK Executable Installer Starts From Network Drive

security-libs/java.security

Change the java.security.manager System Property Default Value to disallow

Disabled SHA-1 Signed JARs

tools/javac

Enclosing Instance Fields Omitted from Inner Classes That Don't Use Them

Corrected References to Overloaded Methods in Javadoc Documentation

core-libs/java.io

Default charset for PrintWriter That Wraps PrintStream

core-libs/java.io:serialization

ObjectInputStream.GetField.get(name, object) Throws ClassNotFoundException

To revert to the old behavior, a system property, jdk.serialGetFieldCnfeReturnsNull, has been added to the implementation. Setting the value to true reverts to the old behavior (returning null); leaving it unset or to any other value results in the throwing of ClassNotFoundException.

Deserialization Filter and Filter Factory Property Error Reporting Were Under Specified

core-libs/javax.naming

System Property to Control Reconstruction of Reference Address Objects by JDK's Built-in JNDI LDAP Implementation

core-libs/java.net

HttpURLConnection's getHeaderFields and URLConnection.getRequestProperties Methods Return Field Values in the Order They Were Added

Prohibit Null for Header Keys and Values in com.sun.net.httpserver.Headers

core-libs/java.nio

ReadableByteChannel::read No Longer Throws ReadOnlyBufferException

Zip File System Provider Throws ZipException When Entry Name Element Contains "." or ".."

core-libs/java.time

Update Timezone Data to 2021c

core-libs/java.util.jar

Disabled JAR Index Support

Closes Out Compressor When IOException Encountered While Using Default JDK Compressor in GZIPOutputStream.finish() , ZipOutputStream.closeEntry() and DeflaterOutputStream.close()

hotspot/gc

ZGC: Fixed Long Process Non-Strong References Times

security-libs/java.security

X509Certificate.get{Subject,Issuer}AlternativeNames and getExtendedKeyUsage Do Not Throw CertificateParsingException if Extension Is Unparseable

security-libs/javax.crypto

Fix Issues With the KW and KWP Modes of SunJCE Provider

security-libs/javax.net.ssl

Call X509KeyManager.chooseClientAlias Once for All Key Types

security-libs/org.ietf.jgss:krb5

Removed Weak etypes From Default krb5 etype List

tools/javac

Index Noteworthy Terms for jdk.compiler and jdk.javadoc Modules

tools/javadoc(tool)

Improved Navigation on Small Devices

DocLint Reports Missing Descriptions

Updated Documentation for DocLint

Indicate Invalid Input in Generated Output

Merge "Exceptions" and "Errors" into "Exception Classes"

core-libs/java.io

file.encoding System Property Has an Incorrect Value on Windows