infer_clone/infer/documentation/issues/ERADICATE_FIELD_NOT_NULLABLE.md

An assignment x.f = v where v could be null and field f is not annotated with @Nullable.

Example:

class C {
  String f;

  void foo(@Nullable String s) {
    f = s;
  }
}

Action: The preferred action is to ensure that a null value is never stored in the field, by changing the code or changing annotations. If this cannot be done, add a @Nullable annotation to the field. This annotation might trigger more warnings in other code that uses the field, as that code must now deal with null values.