Add reactove support to spring-cache by implementing the methods

 
@Nullable
default CompletableFuture<?> retrieve(Object key)

{ throw new UnsupportedOperationException( getClass().getName() + " does not support CompletableFuture-based retrieval"); }
 
and
 
default <T> CompletableFuture<T> retrieve(Object key, Supplier<CompletableFuture<T>> valueLoader) { throw new UnsupportedOperationException( getClass().getName() + " does not support CompletableFuture-based retrieval"); }

 
 
Added in Spring Cache 6.1