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OpenJDK 17 is the latest Long-Term Support (LTS) release of the Java platform.
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For a list of major changes from OpenJDK 11 (java-11-openjdk), see the upstream
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release page for OpenJDK 17 and the preceding interim releases:
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* 12: https://openjdk.java.net/projects/jdk/12/
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* 13: https://openjdk.java.net/projects/jdk/13/
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* 14: https://openjdk.java.net/projects/jdk/14/
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* 15: https://openjdk.java.net/projects/jdk/15/
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* 16: https://openjdk.java.net/projects/jdk/16/
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* 17: https://openjdk.java.net/projects/jdk/17/
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# Rebuilding the OpenJDK package
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The OpenJDK packages are now created from a single build which is then
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packaged for different major versions of Red Hat Enterprise Linux
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(RHEL). This allows the OpenJDK team to focus their efforts on the
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development and testing of this single build, rather than having
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multiple builds which only differ by the platform they were built on.
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This does make rebuilding the package slightly more complicated than a
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normal package. Modifications should be made to the
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`java-17-openjdk-portable.specfile` file, which can be found with this
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README file in the source RPM or installed in the documentation tree
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by the `java-17-openjdk-headless` RPM.
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Once the modified `java-17-openjdk-portable` RPMs are built, they
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should be installed and will produce a number of tarballs in the
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`/usr/lib/jvm` directory. The `java-17-openjdk` RPMs can then be
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built, which will use these tarballs to create the usual RPMs found in
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RHEL. The `java-17-openjdk-portable` RPMs can be uninstalled once the
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desired final RPMs are produced.
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Note that the `java-17-openjdk.spec` file has a hard requirement on
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the exact version of java-17-openjdk-portable to use, so this will
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need to be modified if the version or rpmrelease values are changed in
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`java-17-openjdk-portable.specfile`.
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To reduce the number of RPMs involved, the `fastdebug` and `slowdebug`
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builds may be disabled using `--without fastdebug` and `--without
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slowdebug`.
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