Chapter 2. Eclipse Temurin features
Eclipse Temurin does not contain structural changes from the upstream distribution of OpenJDK.
For the list of changes and security fixes that the latest OpenJDK 17 release of Eclipse Temurin includes, see OpenJDK 17.0.9 Released.
2.1. New features and enhancements
Review the following release notes to understand new features and feature enhancements included with the Eclipse Temurin 17.0.9 release:
Increased default group size of TLS Diffie-Hellman
In OpenJDK 17.0.9, the JDK implementation of TLS 1.2 uses a default Diffie-Hellman key size of 2048 bits. This supersedes the behavior in previous releases where the default Diffie-Hellman key size was 1024 bits.
This enhancement is relevant when a TLS_DHE cipher suite is negotiated and either the client or the server does not support Finite Field Diffie-Hellman Ephemeral (FFDHE) parameters. The JDK TLS implementation supports FFDHE, which is enabled by default and can negotiate a stronger key size.
As a workaround, you can revert to the previous key size by setting the jdk.tls.ephemeralDHKeySize system property to 1024. However, to mitigate risk, consider using the default key size of 2048 bits.
This change does not affect TLS 1.3, which already uses a minimum Diffie-Hellman key size of 2048 bits.
See JDK-8301700 (JDK Bug System).
Output of -XshowSettings:locale option includes tzdata version
In OpenJDK 17.0.9, the -XshowSettings launcher option also prints the tzdata version that the JDK uses. The tzdata version is displayed as part of the output for the -XshowSettings:locale option.
For example:
Locale settings:
default locale = English
default display locale = English
default format locale = English
tzdata version = 2023cSee JDK-8305950 (JDK Bug System).
Certigna root CA certificate added
In OpenJDK 17.0.9, the cacerts truststore includes the following Certigna root certificate:
- Name: Certigna (Dhimyotis)
- Alias name: certignarootca
- Distinguished name: CN=Certigna Root CA, OU=0002 48146308100036, O=Dhimyotis, C=FR
2.2. Deprecated features
Review the following release notes to understand pre-existing features that have been either deprecated or removed in Eclipse Temurin 17.0.9:
SECOM Trust Systems root CA1 certificate removed
OpenJDK 17.0.9 removes the following root certificate from the cacerts truststore:
- Alias name: secomscrootca1 [jdk]
- Distinguished name: OU=Security Communication RootCA1, O=SECOM Trust.net, C=JP
See JDK-8295894 (JDK Bug System).
Revised on 2024-05-03 15:37:37 UTC
