Test on JDK 27 EA

[msridhar]

Run our tests on the latest JDK 27 EA build.

Also fixes our check for explicit @Nullable annotations on lambda parameters, handling a change in the types javac provides in JDK 27.

Summary by CodeRabbit

• Tests

  • Extended CI/CD testing to include JDK 27 Early Access in addition to existing versions, ensuring compatibility across a wider range of Java environments.

• Refactor

  • Improved detection of explicit nullability annotations on lambda parameters for more accurate analysis with newer JDK releases.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.48%. Comparing base (15a35d1) to head (4069828).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1540   +/-   ##
=========================================
  Coverage     88.48%   88.48%           
  Complexity     2843     2843           
=========================================
  Files           103      103           
  Lines          9489     9490    +1     
  Branches       1905     1905           
=========================================
+ Hits           8396     8397    +1     
  Misses          531      531           
  Partials        562      562           

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: fa7fbe39-cdb1-4d10-aeb2-2b97b52c03c9

📥 Commits

Reviewing files that changed from the base of the PR and between 15a35d1 and 4069828.

📒 Files selected for processing (4)

• .github/workflows/continuous-integration.yml
• buildSrc/src/main/groovy/nullaway.java-test-conventions.gradle
• jar-infer/jar-infer-lib/build.gradle
• nullaway/src/main/java/com/uber/nullaway/dataflow/CoreNullnessStoreInitializer.java

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Walkthrough

This PR adds JDK 27 EA support across the build infrastructure and adjusts lambda-parameter nullability detection. Changes include: (1) updating the CI workflow to explicitly install JDK 27 EA before the default JDK setup, (2) extending the Gradle test-conventions matrix to generate a testJdk27 test task, (3) skipping testJdk27 in the jar-infer build, and (4) narrowing lambda-parameter explicit-nullability detection in CoreNullnessStoreInitializer to only check annotations directly present on the symbol.

Possibly related PRs

• Fix for explicitly-typed lambda parameters in JDK 24+ #1452: Modifies how lambda-parameter nullability is detected by redirecting which annotation mirrors are consulted on the symbol.
• Improve inference for generic method with void-returning lambda argument #1312: Modifies CoreNullnessStoreInitializer's lambda-handling logic to integrate GenericsChecks and adjust inferred lambda types.
• Run regression tests on JDK 26 #1526: Extends the same Gradle test-conventions file by adding per-JDK generated test tasks (testJdk26).

Suggested reviewers

• yuxincs
• lazaroclapp
• seemantasaha

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Test on JDK 27 EA' accurately summarizes the primary objective of the PR, which is to add testing support for JDK 27 Early Access.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test-on-jdk-27

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