Qualifier for a reference type in a TYPE_USE position: The type that has this annotation explicitly includes the value null.

If annotation based null analysis is enabled using this annotation has two consequences:

1. Binding a null value to an entity (field, local variable, method parameter or method return value) of this type is legal.
2. Dereferencing an expression of this type is unsafe, i.e., a NullPointerException can occur at runtime.