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Chapter 2. Differences from upstream OpenJDK 17
Red Hat build of OpenJDK in Red Hat Enterprise Linux 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 Red Hat Enterprise Linux updates as closely as possible.
The following list details the most notable Red Hat build of OpenJDK 17 changes:
- FIPS support. Red Hat build of OpenJDK 17 automatically detects whether RHEL is in FIPS mode and automatically configures Red Hat build of OpenJDK 17 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 17 obtains the list of enabled cryptographic algorithms and key size constraints from the RHEL system configuration. 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.
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Red Hat build of OpenJDK on RHEL dynamically links against native libraries such as
zlibfor archive format support andlibjpeg-turbo,libpng, andgiflibfor image support. RHEL also dynamically links againstHarfbuzzandFreetypefor font rendering and management. This change does not apply to Red Hat build of OpenJDK builds for Microsoft Windows. -
The
src.zipfile includes the source for all of 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.
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