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[Feature Request]: Upgrade Gradle wrapper to 9.x for JDK 25 support #40556
Description
What would you like to happen?
Currently, Beam uses Gradle Wrapper 8.14.3.
While Beam already supports compiling and running tests against JDK 25 via Gradle Java Toolchains (#35627 / #36409), the Gradle daemon itself cannot run directly on JDK 25 in Gradle 8.x. Running ./gradlew on a machine where the system default JAVA_HOME is JDK 25 fails at startup unless org.gradle.java.home is manually pointed to an older JDK (like 17 or 21).
To provide an out-of-the-box developer experience on systems with JDK 25 as the default runtime, we should track upgrading the Gradle wrapper to Gradle 9.x (which natively supports running the daemon on JDK 25) once Beam's build plugins and dependencies are compatible with Gradle 9.
Issue Priority
Priority: 2 (default / most feature requests should be filed as P2)
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Activity
alisha-1000 commentedon Oct 23, 2026
Hello,
I’m interested in contributing to this upgrade and would like to help assess the compatibility of Beam’s existing build infrastructure with Gradle 9.x.
I plan to investigate the current Gradle wrapper configuration, identify build plugins and dependencies that may introduce compatibility issues, and evaluate the changes required to support running the Gradle daemon directly on JDK 25.
Based on these findings, I can propose a focused migration plan and work toward a tested implementation that preserves the existing build and test workflows.
Would an initial compatibility assessment be a useful contribution toward moving this issue forward?
CH-Abhinav commentedon Oct 24, 2026
Yes. Once re-check regarding Gradle compatibility with beam and Java 25. From my knowledge there is an issue regarding bytecode/assembly when JDK 25 is used with Gradle especially on Linux/Mac. Once check that as well.
alisha-1000 commentedon Oct 26, 2026
Thanks for highlighting these compatibility concerns.
I've prepared a preliminary Gradle 9 and JDK 25 compatibility migration and opened [PR #40810] for review.
Initial validation confirmed that Gradle 9.8.2 project configuration succeeds on JDK 25, and selected Java modules compile successfully. Java core compilation and tests were validated under JDK 17, with additional testing performed under JDK 25.
I'll continue investigating the potential bytecode and assembly compatibility issues on Linux and macOS, as well as platform-specific build tooling, to identify any reproducible failures and determine whether they originate from Gradle, its plugins, or external dependencies.
During local testing on Apple Silicon, I encountered a
protoc-gen-grpc-javaexecutable architecture mismatch. I'll investigate this separately rather than treating it as evidence of a Gradle bytecode compatibility issue.The PR is open and still requires broader CI validation. Feedback on the migration approach and any additional compatibility concerns would be greatly appreciated.