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NullAway: Practical Type-Based Null Safety for Java

Subarno Banerjee; Lazaro Clapp; Manu Sridharan

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<oai_dc:dc xmlns:dc="" xmlns:oai_dc="" xmlns:xsi="" xsi:schemaLocation="">
  <dc:creator>Subarno Banerjee</dc:creator>
  <dc:creator>Lazaro Clapp</dc:creator>
  <dc:creator>Manu Sridharan</dc:creator>
  <dc:description>NullAway is a tool to help eliminate NullPointerExceptions (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 and Eradicate null checkers for Java.

NullAway is fast. It is built as a plugin to Error Prone 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.</dc:description>
  <dc:subject>static code analysis</dc:subject>
  <dc:subject>pluggable type systems</dc:subject>
  <dc:subject>null safety</dc:subject>
  <dc:title>NullAway: Practical Type-Based Null Safety for Java</dc:title>
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