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JDK 8u231 Update Release Notes

JDK 8 Update Release Notes

Java™ SE Development Kit 8, Update 231 (JDK 8u231)

October 15, 2019

The full version string for this update release is 1.8.0_231-b11 (where "b" means "build"). The version number is 8u231.

IANA Data 2019b

JDK 8u231 contains IANA time zone data version 2019b. For more information, refer to Timezone Data Versions in the JRE Software.

Security Baselines

The security baselines for the Java Runtime Environment (JRE) at the time of the release of JDK 8u231 are specified in the following table:

JRE Family Version JRE Security Baseline (Full Version String)
8 1.8.0_231-b11
7 1.7.0_241-b09

Keeping the JDK up to Date

Oracle recommends that the JDK is updated with each Critical Patch Update (CPU). In order to determine if a release is the latest, the following Security Baseline page can be used to determine which is the latest version for each release family.

Critical patch updates, which contain security vulnerability fixes, are announced one year in advance on Critical Patch Updates, Security Alerts and Bulletins. It is not recommended that this JDK (version 8u231) be used after the next critical patch update scheduled for January 14, 2020. 

Java SE Subscription customers managing JRE updates/installs for large number of desktops should consider using Java Advanced Management Console (AMC).

For systems unable to reach the Oracle Servers, a secondary mechanism expires this JRE (version 8u231) on February 14, 2020. After either condition is met (new release becoming available or expiration date reached), the JRE will provide additional warnings and reminders to users to update to the newer version. For more information, see 23.1.2 JRE Expiration Date in the Java Platform, Standard Edition Deployment Guide.

New Features

 New jdk.jceks.iterationCount System Property 

A new system property has been introduced to control the iteration count value used for the jceks keystore. The default value remains at 200000 but values between 10000 and 5000000 may be specified. The new system property name is jdk.jceks.iterationCount and the value supplied should be an integer in the accepted range. The default value will be used if a parsing error is encountered.

JDK-8223269 (not public)

 New Java Flight Recorder (JFR) Security Events 

Four new JFR events have been added to the security library area. These events are disabled by default and can be enabled via the JFR configuration files or via standard JFR options.

  • java/security_property

    • Records Security.setProperty(String key, String value) method calls
  • java/tls_handshake

    • Records TLS handshake activity. The event fields include:
      • Peer hostname
      • Peer port
      • TLS protocol version negotiated
      • TLS cipher suite negotiated
      • Certificate id of peer client
  • java/x509_validation

    • Records details of X.509 certificates negotiated in successful X.509 validation (chain of trust)
  • java/x509_certificate

    • Records details of X.509 Certificates. The event fields include:
      • Certificate algorithm
      • Certificate serial number
      • Certificate subject
      • Certificate issuer
      • Key type
      • Key length
      • Certificate id
      • Validity of certificate

See JDK-8148188

Removed Features and Options

 Removal of T2K Rasterizer and ICU Layout Engine From JavaFX 

The T2K rasterizer and ICU layout engine have been removed from JavaFX.

See JDK-8187147

Other notes

 [client-libs and javaFX] GTK3 Is Now the Default on Linux/Unix 

Newer versions of Linux, Solaris, and other Unix flavor desktop environments use GTK3, while still supporting GTK2.

Previously, the JDK would default to loading the older GTK2 libraries. However, in this release, it defaults to loading GTK3 libraries. Loading is typically triggered by using the Swing GTK Look And Feel.

The old behavior can be restored by using the system property: -Djdk.gtk.version=2.2

See JDK-8222496

 Using the JDK or JRE on macOS Catalina (10.15)

Changes introduced in macOS 10.15 (Catalina) have caused JCK test failures which will prevent Java from being supported on macOS 10.15. If you still want to install and test then please see http:/java/technologies/javase/jdk-jre-macos-catalina.html.

JDK-8230057 (not public)

 Remove Obsolete NIST EC Curves from the Default TLS Algorithms

This change removes obsolete NIST EC curves from the default Named Groups used during TLS negotiation. The curves removed are sect283k1, sect283r1, sect409k1, sect409r1, sect571k1, sect571r1, and secp256k1.

To re-enable these curves, use the jdk.tls.namedGroups system property. The property contains a comma-separated list within quotation marks of enabled named groups in preference order. For example:

java -Djdk.tls.namedGroups="secp256r1, secp384r1, secp521r1, sect283k1, 
sect283r1, sect409k1, sect409r1, sect571k1, sect571r1, secp256k1" ... 

JDK-8228825 (not public)

 Updated xmldsig Implementation to Apache Santuario 2.1.3 

The XML Signature implementation in this release has been updated to version 2.1.3 of Apache Santuario. New features include:

  • Added support for embedding elliptic curve public keys in the KeyValue element

Earlier features from version 2.1.1 include: 

  • Support for the SHA-224 and SHA-3 DigestMethod algorithms specified in RFC 6931.
  • Support for the HMAC-SHA224, RSA-SHA224, ECDSA-SHA224, and RSASSA-PSS family of SignatureMethod algorithms specified in RFC 6931.

See JDK-8177334

 Updated xmldsig Implementation to Apache Santuario 2.1.1

The XMLDSig provider implementation in the java.xml.crypto module has been updated to version 2.1.1 of Apache Santuario. New features include:

  • Support for the SHA-224 and SHA-3 DigestMethod algorithms specified in RFC 6931.
  • Support for the HMAC-SHA224, RSA-SHA224, ECDSA-SHA224, and RSASSA-PSS family of SignatureMethod algorithms specified in RFC 6931.

See JDK-8177334

 System Property is Turned Off by Default

The system property, which was introduced in the update releases 7u231 and 8u221, is turned off by default.

This option allows control of which implementation of ECC is in use.

When the system property,, is explicitly set to "true" (the value is case-insensitive) the JDK uses the old, native implementation of ECC. If the option is set to an empty string, it is treated as if it were set to "true". This makes it possible to specify in the command line. Setting the option to true or the empty string is not recommended.

If the option is set to "false", or if it is not specified at all, the provider decides which implementation of ECC is used. This is the recommended setting, as the JDK will use modern and timing resistant implementations of the NIST secp256r1, secp384r1, and secp521r1 curves. For more information on which curves are recommended and which are legacy, see

JDK-8224499 (not public)

 Runtime.exec and ProcessBuilder Argument Restrictions 

Runtime.exec and ProcessBuilder have been updated in this release to tighten the constraints on the quoting of arguments to processes created by these APIs. The changes may impact applications on Microsoft Windows that are deployed with a security manager. The changes have no impact on applications that are run without a security manager.

In applications where there is no security manager, there is no change in the default behavior and the new restrictions are opt-in. To enable the restrictions, set the system property jdk.lang.Process.allowAmbiguousCommands to false.

In applications where there is a security manager, the new restrictions are opt-out. To revert to the previous behavior set the system property jdk.lang.Process.allowAmbiguousCommands to true.

Applications using Runtime.exec or ProcessBuilder with a security manager to invoke .bat or .cmd and command names that do not end in ".exe" may be more restrictive in the characters accepted for arguments if they contain double-quote, "&", "|", "<", ">", or "^". The arguments passed to applications may be quoted differently than in previous versions.

For .exe programs, embedded double quotes are allowed and are encoded so they are passed to Windows as literal quotes. In the case where the entire argument has been passed with quotes or must be quoted to encode special characters including space and tab, the encoding ensures they are passed to the application correctly. The restrictions are enforced if there is a security manager and the jdk.lang.Process.allowAmbiguousCommands property is "false" or there is no security manager and property is not "false".

JDK-8221858 (not public)

Bug Fixes 

This release also contains fixes for security vulnerabilities described in the Oracle Critical Patch Update. For a more complete list of the bug fixes included in this release, see the JDK 8u231 Bug Fixes page.