File: FieldMissingNullable.md

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Fields that may be `null` should be annotated with `@Nullable`. For example, do
this:

```java
public class Foo {
  @Nullable private String message = "hello";
  public void reset() {
    message = null;
  }
}
```

Not this:

```java
public class Foo {
  private String message = "hello";
  public void reset() {
    message = null;
  }
}
```