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Allow nullable method references for void functions - #1747
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Treat void functional-interface return types as having no nullness contract when checking method references. This permits references to nullable-returning methods when Java discards the returned value, while leaving parameter compatibility checks intact. Add JSpecify JDK model regression coverage for bound and static method references used by Map.forEach and Collection.forEach, the equivalent lambda form, and continued reporting of parameter-nullability mismatches. Fixes #1719
WalkthroughNullAway now treats void methods as not having non-null returns during override analysis. This prevents non-null return override validation from applying to void methods. A JSpecify compilation test covers nullable-returning method references passed to Merge Risk: ⚪ Minimal · up to The change is localized to void-return compatibility and regression coverage; the only outstanding issue is missing private-method documentation, which does not affect runtime behavior or create a merge-blocking risk. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Linked Issues checkExplanation The implementation makes void-returning functional interfaces exempt from return-nullability override checks. The added tests cover nullable method references with Map.forEach and Collection.forEach while preserving parameter-nullability checks, satisfying issue ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@nullaway/src/main/java/com/uber/nullaway/NullAway.java`:
- Around line 1359-1361: Add Javadoc to the private
overriddenMethodReturnsNonNull method describing its return contract, including
that it reports whether the overridden method has a non-null return and returns
false for methods whose return type is TypeKind.VOID.
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nullaway/src/main/java/com/uber/nullaway/NullAway.javanullaway/src/test/java/com/uber/nullaway/JSpecifyJDKModelsTest.java
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Treat void functional-interface return types as having no nullness contract when checking method references. This permits references to nullable-returning methods when Java discards the returned value, while leaving parameter compatibility checks intact.
Add JSpecify JDK model regression coverage for bound and static method references used by Map.forEach and Collection.forEach, the equivalent lambda form, and continued reporting of parameter-nullability mismatches.
Fixes #1719
Summary by CodeRabbit
Bug Fixes
void, preventing incorrect override checks.Tests