| Annotation Type | Description | 
|---|---|
| Incubating | 
 Signifies that the annotated functionality is currently in a developmental phase. 
 | 
| NonNull | 
 A common Reactor annotation (similar to Spring ones) to declare that annotated elements
 cannot be  
null. | 
| NonNullApi | 
 A common Reactor annotation (similar to Spring one) to declare that parameters and return
 values are to be considered as non-nullable by default for a given package. 
 | 
| Nullable | 
 A common Reactor annotation (similar to Spring ones) to declare that annotated elements
 can be  
null under some circumstance. |