WG – Java 25 Support in Quarkus

[cescoffier]

Objective

To enable Quarkus applications to run cleanly across dev/test/production modes on Java 25, with no requirement to adopt Java 25 as a baseline.

The Problem

Java 25 brings new features and platform-level changes (e.g., new JEPs, VM flags, performance tweaks) that may trigger warnings, break behavior, or degrade Quarkus experiences. Dependencies or extensions may also face compatibility challenges. A coordinated effort is needed to identify, fix, document, and optionally leverage these changes.

The Solution

The working group will:

• Attempt to run representative Quarkus applications under Java 25 in dev, test, and production modes.
• Catalog issues, warnings, or incompatibilities in a Wiki or issue tracker.
• Propose and implement fixes or mitigations (or document workarounds).
• Optionally explore beneficial Java 25 features (e.g., Scoped Values, Flexible Constructor Bodies), without requiring their use.
• Identify and remediate or flag problematic Quarkus extensions.
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Definition of Done

• Publish a wiki page detailing issues and resolutions.
• Ensure Quarkus core and its ecosystem can operate cleanly under Java 25 in all modes.
• Integrate any selected Java 25 features in an optional, non-breaking manner.
• Document or fix problematic extensions, offering guidance where needed.
• Communicate results via a blog post or quarkus-dev announcement.
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Scope of Work

In scope:

• Running and diagnosing Quarkus on Java 25.
• Fixing issues in Quarkus core repository and extensions.
• Exploring select Java 25 enhancements.

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Out of scope:

• Mandating Java 25 as the minimum supported runtime.

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Organizing the Work

1. Communication & Transparency:
   • Use GitHub discussion, project board, and issues.
   • Coordinate via Quarkus Zulip and GitHub.
2. Points of Contact:
   • Sanne and Guillaume.
3. Timeline & Milestones:
   • Exploration Phase: Run tests on Java 25 Candidate Release, document findings before GA (target: before September 16, 2025), so we can guide our users as soon as Java 25 reaches GA.

[cescoffier]

I will create the working group today.