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README.md

Java 13 Release Notes Documentation

Release Notes

New Features and Enhancements

core-libs/java.nio

Three new methods have been added to java.nio.file.FileSystems to make it easier to use file system providers that treat the contents of a file as a file system.

  • newFileSystem(Path)
  • newFileSystem(Path, Map<String, ?>)
  • newFileSystem(Path, Map<String, ?>, ClassLoader)

New java.nio.ByteBuffer Bulk get/put Methods Transfer Bytes Without Regard to Buffer Position

java.nio.ByteBuffer and the other buffer types in java.nio now define absolute bulk get and put methods to transfer contiguous sequences of bytes without regard to or effect on the buffer position.

core-libs/java.time

New Japanese Era Name Reiwa

An instance representing the new Reiwa era has been added to this update. Unlike other eras, there is no public field for this era. It can be obtained by calling JapaneseEra.of(3) or JapaneseEra.valueOf("Reiwa"). JDK 13 and later will have a new public field to represent this era.

core-libs/java.util:i18n

Support for Unicode 12.1

hotspot/gc

JEP 351 ZGC Uncommit Unused Memory

Added -XXSoftMaxHeapSize Flag

ZGC Maximum Heap Size Increased to 16TB

From 4TB to 16TB.

hotspot/runtime

JEP 350 Dynamic CDS Archiving

security-libs/java.security

Configurable Read Timeout for CRLs

New keytool -showinfo -tls Command for Displaying TLS Configuration Information

security-libs/javax.crypto

Support for MS Cryptography Next Generation (CNG)

security-libs/javax.crypto:pkcs11

SunPKCS11 Provider Upgraded with Support for PKCS#11 v2.40

security-libs/javax.net.ssl

Support for X25519 and X448 in TLS

Session Resumption without Server-Side State in JSSE

security-libs/javax.security

Allow SASL Mechanisms to Be Restricted

security-libs/javax.xml.crypto

New String Constants for Canonical XML 1.1 URIs

[xmldsig] Added KeyValueEC_TYPE

security-libs/org.ietf.jgss

Added a Default Native GSS-API Library on Windows

security-libs/org.ietf.jgss:krb5

Support for Kerberos Cross-Realm Referrals (RFC 6806)

tools/javac

JEP 354 Switch Expressions (Preview)

JEP 355 Text Blocks (Preview)

xml/jaxp

New Methods for Creating DOM and SAX Factories with Namespace Support

Removed Features and Options

client-libs

Removal of awt.toolkit System Property

core-libs/java.lang

Removal of Runtime Trace Methods

core-libs/java.net

Pre-JDK 1.4 SocketImpl Implementations No Longer Supported

hotspot/runtime

Removal of VM option -XX+AggressiveOpts

security-libs

Duplicated RSA Services No Longer Supported by SunJSSE Provider

security-libs/java.security

Removal of T-Systems Deutsche Telekom Root CA 2 Certificate

Removal of Two DocuSign Root CA Certificates

Removal of Two Comodo Root CA Certificates

security-libs/javax.net.ssl

Removal of the Internal com.sun.net.ssl Package Only Used for Compatibility with Legacy JSSE 1.0 Applications

Removal of Experimental FIPS 140 Compliant Mode from SunJSSE Provider

tools/javadoc(tool)

Removal of Old Features from javadoc Tool

The following four features have been removed from the javadoc tool:

  • Support for generating API documentation using HTML 4
  • Support for the "old" javadoc API
  • Support for generating documentation using HTML frames
  • Support for the --no-module-directories option

Deprecated Features and Options

client-libs

Deprecated and Unsupported Swing Motif Look and Feel on macOS

In the source code, Swing Motif Look and Feel is deprecated with the intent to remove it in a future release. Use javax.swing.plaf.metal.MetalLookAndFeel instead.

core-libs/java.rmi

Deprecated rmic Tool for Removal

hotspot/runtime

Deprecated Java Options -Xverifynone and -noverify

security-libs/javax.net.ssl

Deprecated javax.security.cert APIs with forRemoval=true

Other notes

client-libs

GraphicsEnvironment.getCenterPoint() and getMaximumWindowBounds() are Unified Across Platforms

client-libs/2d

Windows 2019 Core Server Is Not Supported

core-libs

Improved Handling of the "Class-Path" JAR Manifest Attribute

core-libs/java.lang

StringBuffer(CharSequence) and StringBuilder(CharSequence) Throw NegativeArraySizeException for Negatively Sized Argument

Default Process launch mechanism on Linux now uses posix_spawn

Runtime.exec() and ProcessBuilder, on Linux now use posix_spawn(3) to spawn child processes. This increases reliability and performance in low-memory situations.

core-libs/java.lang.invoke

Lookup.unreflectSetter(Field) Now Throws IllegalAccessException for Static Final Fields

core-libs/java.net

Change to Default Implementation of SocketImpl Methods supportedOptions, getOption, and setOption

Change to ServerSocket.accept() When the System-Wide Factory for Client or Server Socket Implementations Is Set

JEP 353 Reimplement the Legacy Socket API

core-libs/java.nio

Files.createSymbolicLink Can Be Used in "Developer Mode" Without Additional Privileges

JNI NewDirectByteBuffer Creates Direct Buffer That Is java.nio.ByteOrder.BIG_ENDIAN

Files.isHidden Returns true for Hidden Directories on Windows

core-libs/java.nio.charsets

Corrected UnicodeDecoder U+FFFE Handling

core-libs/java.time

DateTimeFormatter now throws DateTimeParseException on Invalid HOUR_OF_AMPM

core-libs/java.util

Base64.Encoder and Base64.Decoder Methods Can Throw OutOfMemoryError

Properties Files Containing Malformed Unicode Was Sometimes Misparsed

core-libs/java.util.jar

Using the ZIP File System (zipfs) Provider to Update a ZIP or JAR File Containing Uncompressed Entries Might Corrupt the File

core-libs/java.util.logging

NullPointerException in java.util.logging.Handler#isLoggable

core-libs/java.util:i18n

Upgraded CLDR to Version 35.1

hotspot/compiler

More Registers Available When Running Without Compressed References on x86_64

hotspot/gc

Improve Ergonomics for Sparse PRT Entry Size

Improvements in Serial GC Young pause time report

Improve the Behavior of MaxRAM Settings and UseCompressedOops

The following are the options impacted by this change:

  • -XX:MaxRAMPercentage
  • -XX:MaxRAMFraction
  • -XX:MinRAMPercentage
  • -XX:MinRAMFraction
  • -XX:InitialRAMPercentage
  • -XX:InitialRAMFraction
  • -XX:MaxRAM

Note: This change only impacts 64-bit platforms.

security-libs/javax.crypto

Use SunJCE Mac in SecretKeyFactory PBKDF2 Implementation

security-libs/javax.crypto:pkcs11

Memory Growth Issue in SunPKCS11 Fixed

security-libs/javax.net.ssl

Updated the Default Enabled Cipher Suites Preference

Use Server Cipher Suites Preference by Default

security-libs/javax.xml.crypto

Updated XML Signature Implementation to Apache Santuario 2.1.3

tools/javac

Bad EnclosingMethod Attribute on Classes Declared in Lambdas

javac Rejects Class Files with Broken EnclosingMethod Attribute

tools/javap

javap Checksum Uses SHA-256

javap includes a checksum of the contents of the class file in verbose output. The checksum is now calculated with the SHA-256 algorithm, instead of the older MD5 algorithm.

tools/jlink

A jrt URI Can Only Encode Paths to Files in /modules Tree

xml/javax.xml.parsers

Change DOM Parser to Not Resolve EntityReference and Add Text Node with DocumentBuilderFactory.setExpandEntityReferences(false)