code: public static <KEY, VALUE> SimpleKeyValue<KEY, VALUE> from(Map.Entry<KEY, VALUE> mapEntry) {
  
      Assert.notNull(mapEntry, "Map.Entry is required");
  
      return newKeyValue(mapEntry.getKey(), mapEntry.getValue());
    }
docs: Factory method used to construct a new instance of {@link SimpleKeyValue} initialized from the given {@link Map.Entry}.
  
  @param <KEY> {@link Class type} of the key.
  @param <VALUE> {@link Class type} of the value.
  @param mapEntry {@link Map.Entry} used to construct and initialize an instance of {@link SimpleKeyValue}.
  @return a new instance of {@link SimpleKeyValue} initialized from the the given {@link Map.Entry}.
  @see #newKeyValue(Object, Object)
  @see java.util.Map.Entry