[bazel + java] Use a transition to target Java 11 for our maven artifacts

[shs96c]

User description

This allows us to use Java 21 elsewhere in the repo where it might be useful (Tests! Tests! Tests!) without needing to monkey around with special flags.

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PR Type

enhancement, configuration changes

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Description

• Implemented a transition to target Java 11 for Maven artifacts using with_cfg in export.bzl.
• Updated the Java toolchain in .bazelrc to use version 21, allowing flexibility to use Java 21 elsewhere in the repository.
• Added a new dependency on with_cfg.bzl in MODULE.bazel to support the configuration transition.

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Changes walkthrough 📝

	Relevant files
Enhancement	export.bzl Implement transition to Java 11 for Maven artifacts            java/private/export.bzl Added a transition to target Java 11 using with_cfg. Modified java_module to use the new configuration. +6/-1
Configuration changes	.bazelrc Update Java toolchain to version 21                                            .bazelrc Updated Java toolchain versions to 21. Removed default targeting of Java 11. Added comments explaining the transition to Java 11 for binaries. +7/-8
Dependencies	MODULE.bazel Add dependency for configuration transition                            MODULE.bazel Added a dependency on with_cfg.bzl version 0.6.0. +1/-0

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Configuration Validation Verify that the Java 11 transition configuration is properly applied to all maven artifacts and doesn't have unintended side effects on other build targets Version Compatibility Ensure that using Java 21 for build tooling while targeting Java 11 for artifacts doesn't create any compatibility issues or unexpected behavior

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PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Score
Possible issue	Add validation checks for configuration operations to prevent silent failures in Java version targeting Add error handling to validate that the Java version configuration was successful, as failed configuration could lead to incorrect Java version targeting. java/private/export.bzl [12-14] _builder = with_cfg(_java_module) -_builder.set("java_language_version", "11").set("java_runtime_version", "remotejdk_11") -java_module, _ = _builder.build() +result = _builder.set("java_language_version", "11").set("java_runtime_version", "remotejdk_11") +if not result: + fail("Failed to configure Java 11 version settings") +java_module, status = _builder.build() +if not status: + fail("Failed to build Java module with version configuration") Apply this suggestion Suggestion importance[1-10]: 8 Why: The suggestion adds important error handling to validate Java version configuration, which is critical since incorrect Java version targeting could lead to build and runtime issues. Silent failures in this configuration could be hard to debug.	8

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