org.checkerframework.checker.optional.qual

Annotation Type MaybePresent

@Documented
 @Retention(value=RUNTIME)
 @Target(value={TYPE_USE,TYPE_PARAMETER})
 @SubtypeOf(value={})
 @DefaultQualifierInHierarchy
public @interface MaybePresent

The Optional container may or may not contain a value.

See the Checker Framework Manual:

Optional Checker