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 ## NullAway: Fast Annotation-Based Null Checking for Java [![Build Status](https://github.com/uber/nullaway/actions/workflows/continuous-integration.yml/badge.svg)](https://github.com/uber/nullaway/actions/workflows/continuous-integration.yml) [![Coverage Status](https://codecov.io/github/uber/NullAway/coverage.svg?branch=master)](https://codecov.io/github/uber/NullAway?branch=master)
 
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 NullAway is a tool to help eliminate `NullPointerException`s (NPEs) in your Java code.  To use NullAway, first add `@Nullable` annotations in your code wherever a field, method parameter, or return value may be `null`.  Given these annotations, NullAway performs a series of type-based, local checks to ensure that any pointer that gets dereferenced in your code cannot be `null`.  NullAway is similar to the type-based nullability checking in the Kotlin and Swift languages, and the [Checker Framework](https://checkerframework.org/) and [Eradicate](https://fbinfer.com/docs/checker-eradicate/) null checkers for Java.
 
 NullAway is *fast*.  It is built as a plugin to [Error Prone](http://errorprone.info/) and can run on every single build of your code.  In our measurements, the build-time overhead of running NullAway is usually less than 10%.  NullAway is also *practical*: it does not prevent all possible NPEs in your code, but it catches most of the NPEs we have observed in production while imposing a reasonable annotation burden, giving a great "bang for your buck."