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JDK 8u291 Update Release Notes

JDK 8 Update Release Notes

Java™ SE Development Kit 8, Update 291 (JDK 8u291)

April 20, 2021

The full version string for this update release is 1.8.0_291-b10 (where "b" means "build"). The version number is 8u291.

IANA TZ Data 2020e, 2020f, 2021a

JDK 8u291 contains IANA time zone data 2020e, 2020f, 2021a.

  • * Volgograd switches to Moscow time on 2020-12-27 at 02:00.
  • * South Sudan changes from +03 to +02 on 2021-02-01 at 00:00.

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 8u291 are specified in the following table:

JRE Family Version JRE Security Baseline (Full Version String)
8 1.8.0_291-b10
7 1.7.0_301-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 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 8u291) be used after the next critical patch update scheduled for July 20, 2021.

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 8u291) on 2021-08-20. 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.

Other Notes

 New System and Security Properties to Control Reconstruction of Remote Objects by JDK's Built-in JNDI RMI and LDAP Implementations

jdk.jndi.object.factoriesFilter: This system and security property allows a serial filter to be specified that controls the set of object factory classes permitted to instantiate objects from object references returned by naming/directory systems. The factory class named by the reference instance is matched against this filter during remote reference reconstruction. The filter property supports pattern-based filter syntax with the format specified by JEP 290. This property applies both to the JNDI/RMI and the JNDI/LDAP built-in provider implementations. The default value allows any object factory class specified in the reference to recreate the referenced object.

com.sun.jndi.ldap.object.trustSerialData: This system property allows control of the deserialization of java objects from the javaSerializedData LDAP attribute. To prevent deserialization of java objects from the attribute, the system property can be set to false value. By default, deserialization of java objects from the javaSerializedData attribute is allowed.

JDK-8244473 (not public)

 Added 2 HARICA Root CA Certificates

The following root certificates have been added to the cacerts truststore:

  + haricarootca2015
    DN: CN=Hellenic Academic and Research Institutions RootCA 2015, O=Hellenic Academic and Research Institutions Cert. Authority, L=Athens, C=GR

  + haricaeccrootca2015
    DN: CN=Hellenic Academic and Research Institutions ECC RootCA 2015, O=Hellenic Academic and Research Institutions Cert. Authority, L=Athens, C=GR
See JDK-8256421

 Default java Version Is Not Updated for Double Click jar Execution

If the PATH environment variable contains a record configured by Oracle JDK installers from newer releases, the Oracle JRE installer inserts the path to the directory containing the Java commands (java.exe, javaw.exe, and javaws.exe) in the PATH environment variable after that record. Previously, the Oracle JRE installer ignored changes made to the PATH environment variable by Oracle JDK installers from newer releases and incorrectly updated the value of PATH environment variable. Please see the following CSR for additional technical information:

See JDK-8259215

 Disable TLS 1.0 and 1.1

TLS 1.0 and 1.1 are versions of the TLS protocol that are no longer considered secure and have been superseded by more secure and modern versions (TLS 1.2 and 1.3).

These versions have now been disabled by default. If you encounter issues, you can, at your own risk, re-enable the versions by removing "TLSv1" and/or "TLSv1.1" from the jdk.tls.disabledAlgorithms security property in the configuration file.

See JDK-8202343

 Disable TLS 1.0 and 1.1 for Java Plugin Applets and Java Web Start Applications

TLS 1.0 and 1.1 have been disabled. These protocols are NOT used by Java Plugin applets and Java Web Start applications by default. In case of any issues there is an option to re-enable the protocols via Java Control Panel.

JDK-8255892 (not public)

 Less Ambiguous Processing of ProcessBuilder Quotes on Windows

In the java.lang.ProcessBuilder implementation on Windows, the system property jdk.lang.Process.allowAmbiguousCommands=false ensures, for each argument, that double-quotes are properly encoded in the command string passed to Windows CreateProcess. An argument with a final trailing double-quote preceded by a backslash is encoded as a literal double-quote; previously, the argument including the double-quote would be joined with the next argument. An empty argument is encoded as a pair of double-quotes ("") resulting in a zero length string passed for the argument to the process; previously, it was silently ignored. An argument containing double-quotes, other than first and last, is encoded to preserve the double-quotes when passed to the process; previously, the embedded double-quotes would be dropped and not passed to the process. If a security manager is set, such as in WebStart applications, double-quotes are encoded as described. When there is no security manager, there is no change to existing behavior; the jdk.lang.Process.allowAmbiguousCommands property can be set to true: jdk.lang.Process.allowAmbiguousCommands=true or false. If left unset, it is the same as setting it to true.

JDK-8250568 (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 8u291 Bug Fixes page.