Release notes for Red Hat build of OpenJDK 11.0.10

Red Hat build of OpenJDK 11

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Abstract

This document provides an overview of new features in Red Hat build of OpenJDK 11, as well as a list of potential known issues and possible workarounds.

Preface

Open Java Development Kit (OpenJDK) is a free and open source implementation of the Java Platform, Standard Edition (Java SE). The Red Hat build of Red Hat build of OpenJDK is available in two versions, Red Hat build of OpenJDK 8u and Red Hat build of OpenJDK 11u.

Packages for the Red Hat build of Red Hat build of OpenJDK are made available on Red Hat Enterprise Linux and Microsoft Windows and shipped as a JDK and JRE in the Red Hat Container Catalog.

Providing feedback on Red Hat build of OpenJDK documentation

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Making open source more inclusive

Red Hat is committed to replacing problematic language in our code, documentation, and web properties. We are beginning with these four terms: master, slave, blacklist, and whitelist. Because of the enormity of this endeavor, these changes will be implemented gradually over several upcoming releases. For more details, see our CTO Chris Wright’s message.

Chapter 1. Support policy for Red Hat build of OpenJDK

Red Hat will support select major versions of Red Hat build of OpenJDK in its products. For consistency, these are the same versions that Oracle designates as long-term support (LTS) for the Oracle JDK.

A major version of Red Hat build of OpenJDK will be supported for a minimum of six years from the time that version is first introduced. For more information, see the OpenJDK Life Cycle and Support Policy.

Note

RHEL 6 reached the end of life in November 2020. Because of this, Red Hat build of OpenJDK is not supporting RHEL 6 as a supported configuration.

Chapter 2. Differences from upstream OpenJDK 11

Red Hat build of OpenJDK in Red Hat Enterprise Linux (RHEL) contains a number of structural changes from the upstream distribution of OpenJDK. The Microsoft Windows version of Red Hat build of OpenJDK attempts to follow RHEL updates as closely as possible.

The following list details the most notable Red Hat build of OpenJDK 11 changes:

  • FIPS support. Red Hat build of OpenJDK 11 automatically detects whether RHEL is in FIPS mode and automatically configures Red Hat build of OpenJDK 11 to operate in that mode. This change does not apply to Red Hat build of OpenJDK builds for Microsoft Windows.
  • Cryptographic policy support. Red Hat build of OpenJDK 11 obtains the list of enabled cryptographic algorithms and key size constraints from RHEL. These configuration components are used by the Transport Layer Security (TLS) encryption protocol, the certificate path validation, and any signed JARs. You can set different security profiles to balance safety and compatibility. This change does not apply to Red Hat build of OpenJDK builds for Microsoft Windows.
  • Red Hat build of OpenJDK on RHEL dynamically links against native libraries such as zlib for archive format support and libjpeg-turbo, libpng, and giflib for image support. RHEL also dynamically links against Harfbuzz and Freetype for font rendering and management.
  • The src.zip file includes the source for all the JAR libraries shipped with Red Hat build of OpenJDK.
  • Red Hat build of OpenJDK on RHEL uses system-wide timezone data files as a source for timezone information.
  • Red Hat build of OpenJDK on RHEL uses system-wide CA certificates.
  • Red Hat build of OpenJDK on Microsoft Windows includes the latest available timezone data from RHEL.
  • Red Hat build of OpenJDK on Microsoft Windows uses the latest available CA certificate from RHEL.

Additional resources

Chapter 3. Red Hat build of OpenJDK features

3.1. New features and enhancements

This section describes the new features introduced in this release. It also contains information about changes in the existing features.

Note

3.1.1. Added -groupname option to keytool key pair generation command

A new -groupname option has been added to the keytool -genkeypair command. Use the -groupname option to specify a named elliptic curve (EC) group when generating a key pair.

For example, the following command generates an EC key pair using the secp384r1 curve: keytool -genkeypair -keyalg EC -groupname secp384r1

It is recommended that you use the -groupname option over the -keysize option, because there might be multiple curves of the same size.

For more information, see JDK-8213821.

3.1.2. Added support for X25519 and X448 in TLS

The named elliptic curve groups x25519 and x448 are now available for JSSE key agreement in TLS versions 1.0 to 1.3.

The curve group x25519 is the most preferred of the default enabled named groups. The default ordered list is as follows:

  • x25519
  • secp256r1
  • secp384r1
  • secp521r1
  • x448
  • secp256k1
  • ffdhe2048
  • ffdhe3072
  • ffdhe4096
  • ffdhe6144
  • ffdhe8192

Use the system property jdk.tls.namedGroups to override the default list.

For more information, see JDK-8225764.

3.1.3. Added default native GSS-API library on Windows

A native GSS-API library has been added to JDK on the Windows platform. The library is client-side only and uses the default credentials. It is activated by setting the sun.security.jgss.native system property to "true". A user can still make use of a third-party native GSS-API library instead by setting the system property sun.security.jgss.lib to its path.

For more information, see JDK-8214079.

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