NullAway

Adds typically less than 10% overhead to builds by running as an Error Prone plugin, enabling frequent checks without significant slowdown, as stated in the README.

Works with multiple @Nullable annotation libraries like JSpecify, AndroidX, or JetBrains, allowing teams to use their preferred tools without vendor lock-in.

Supports configurable package scoping to check specific packages, making it easy to incrementally add null-safety to large existing codebases, as highlighted in the features.

Catches most common NullPointerExceptions observed in production, offering high value with reasonable annotation effort, aligning with its philosophy of practicality.