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* Targeted release: [https://docs.fedoraproject.org/en-US/releases/f41/ Fedora Linux 41]
* Targeted release: [https://docs.fedoraproject.org/en-US/releases/f41/ Fedora Linux 41]
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     https://fedoraproject.org/wiki/Changes/perl5.26 (major upgrade to a popular software stack, visible to users of that stack)
     https://fedoraproject.org/wiki/Changes/perl5.26 (major upgrade to a popular software stack, visible to users of that stack)
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* Very little user-visible benefit.
* Reduced dependencies of Java packages.
* Simplified maintenance of Java packages.
** Smaller impact of JDK major updates (e.g. `1.8.0 -> 11 -> 17 -> 21`)


== Scope ==
== Scope ==
* Proposal owners:
* Proposal owners:
<!-- What work do the feature owners have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
<!-- What work do the feature owners have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
** Find all Java applications in Fedora, i.e. packages which `BuildRequire` `java-devel / maven-local / ant` and at the same time install files into `/bin` or `/sbin` or `/usr/bin` or `/usr/sbin`.
** Add `Requires: java-headless` into their `.spec` file.
** Remove `Requires` generator from [https://src.fedoraproject.org/rpms/javapackages-tools/blob/8714cc1d03d3f31251539c3fca53383b822834bc/f/javapackages-config.json#_5 javapackages-tools]
** Wait for a mass rebuild.


* Other developers: <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
* Other developers: <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
<!-- What work do other developers have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
<!-- What work do other developers have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
** Maintainers of Java applications will need to add an explicit `Requires: java-headless` field into their `.spec` file.


* Release engineering: [https://pagure.io/releng/issues #Releng issue number] <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
* Release engineering: [https://pagure.io/releng/issues #Releng issue number] <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
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The issue is required to be filed prior to feature submission, to ensure that someone is on board to do any process development work and testing and that all changes make it into the pipeline; a bullet point in a change is not sufficient communication -->
The issue is required to be filed prior to feature submission, to ensure that someone is on board to do any process development work and testing and that all changes make it into the pipeline; a bullet point in a change is not sufficient communication -->


* Policies and guidelines: N/A (not needed for this Change) <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
* Policies and guidelines:
<!-- Do the packaging guidelines or other documents need to be updated for this feature?  If so, does it need to happen before or after the implementation is done?  If a FPC ticket exists, add a link here. Please submit a pull request with the proposed changes before submitting your Change proposal. -->
<!-- Do the packaging guidelines or other documents need to be updated for this feature?  If so, does it need to happen before or after the implementation is done?  If a FPC ticket exists, add a link here. Please submit a pull request with the proposed changes before submitting your Change proposal. -->
** Guidelines need to be changed and carefully worded.
** '''TODO'''


* Trademark approval: N/A (not needed for this Change)
* Trademark approval: N/A (not needed for this Change)
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<!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
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== How To Test ==
== How To Test ==

Revision as of 10:57, 10 April 2024

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Drop Mandatory Requires on JRE

This is a proposed Change for Fedora Linux.
This document represents a proposed Change. As part of the Changes process, proposals are publicly announced in order to receive community feedback. This proposal will only be implemented if approved by the Fedora Engineering Steering Committee.

Summary

Drop the requirement of Java libraries to have Requires on JREs.

Owner

Current status

  • Targeted release: Fedora Linux 41
  • Last updated: 2024-04-10
  • [<will be assigned by the Wrangler> devel thread]
  • FESCo issue: <will be assigned by the Wrangler>
  • Tracker bug: <will be assigned by the Wrangler>
  • Release notes tracker: <will be assigned by the Wrangler>

Detailed Description

Current guidelines require all Java packages to Require: java-headless or java-headless >= 1:minimal_required_version.

Our aim is to drop this explicit requirement on Java library packages. The requirement should stay for Java applications.

Context

Java packages are compiled using javac into .class files and composed into .jar archives. Jar archives can be used as compile or runtime dependencies for other packages or can be directly executed with the java command provided by a JRE.

Jar archives can be executed using the command: java -jar ${FILE}. This command executes the main method either specified via CLI or specified within the Jar manifest file.

Java packages, which serve as libraries only, lack the main method and are not executable. Therefore, there is no requirement on any specific JRE imposed by the library implicitly.

Feedback

Benefit to Fedora

  • Very little user-visible benefit.
  • Reduced dependencies of Java packages.
  • Simplified maintenance of Java packages.
    • Smaller impact of JDK major updates (e.g. 1.8.0 -> 11 -> 17 -> 21)

Scope

  • Proposal owners:
    • Find all Java applications in Fedora, i.e. packages which BuildRequire java-devel / maven-local / ant and at the same time install files into /bin or /sbin or /usr/bin or /usr/sbin.
    • Add Requires: java-headless into their .spec file.
    • Remove Requires generator from javapackages-tools
    • Wait for a mass rebuild.
  • Other developers:
    • Maintainers of Java applications will need to add an explicit Requires: java-headless field into their .spec file.
  • Policies and guidelines:
    • Guidelines need to be changed and carefully worded.
    • TODO
  • Trademark approval: N/A (not needed for this Change)
  • Alignment with Community Initiatives:

Upgrade/compatibility impact

How To Test

User Experience

Dependencies

Contingency Plan

  • Contingency mechanism: (What to do? Who will do it?) N/A (not a System Wide Change)
  • Contingency deadline: N/A (not a System Wide Change)
  • Blocks release? N/A (not a System Wide Change), Yes/No


Documentation

N/A (not a System Wide Change)

Release Notes

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