uber/NullAway

Health v2 · maintenance only

Adoption not part of the score

4092 stars · 359 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

NullAway is an Error Prone plugin that performs fast, annotation-based nullability checking for Java code to eliminate NullPointerExceptions. It runs on every build with under 10% overhead, catching most production NPEs with a reasonable annotation burden.

Use cases

• eliminate NullPointerExceptions in Java code
• add null safety checks to a Gradle build
• find potential null dereferences before runtime
• enforce @Nullable annotations across a Java codebase
• add nullability checking to an Android app
• run fast static analysis on every build

When to choose

• you want fast null checking that can run on every build
• you prefer annotation-based nullability similar to Kotlin or Swift
• you already use Error Prone or Gradle
• you want a practical balance of safety versus annotation burden

When to avoid

• you need exhaustive formal verification of all possible NPEs
• your project cannot use JDK 17+ or Error Prone
• you cannot add nullability annotations to your codebase

Facets

library · maturity active

linter developer-tools build-tool developer-tools programming-languages android-tools jvm cli null-safety error-prone-plugin nullpointerexception static-code-analysis jspecify android

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markdown · JSON · MCP: product_card(name="uber/NullAway")