Require Java 21

[mernst]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 95d99599-daf4-4970-922d-93de33b95a26

📥 Commits

Reviewing files that changed from the base of the PR and between 0e53738 and 1d531bd.

📒 Files selected for processing (2)

• build.gradle
• settings.gradle

📝 Walkthrough

Walkthrough

The pull request updates the Java version requirements across the project. The CI workflow matrix now tests with Java 21 and 25, removing Java 17. The build configuration elevates source and target compatibility to Java 21 from 11, removes Java version predicates, and unconditionally applies the Error Prone plugin with simplified compiler configurations. The settings.gradle file updates its Java version guard from 17+ to 21+. A TODO comment related to JDK 18 is removed from CreateJavadocIndex.java.

Possibly related PRs

• Test under JDK 25, not JDK 25-ea #259: Modifies the CI Java-version matrix in .github/workflows/gradle.yml by changing which Java releases are tested.

🚥 Pre-merge checks | ✅ 1

✅ Passed checks (1 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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