code: public static MediaType wildcard(String type) {
  		requireNonNull(type,TYPE_CANNOT_BE_NULL);
  		return new ImmutableMediaType(MediaTypes.preferredSyntax(),type,WILDCARD_TYPE,null,null);
  	}
docs: Create a wildcard media type for a given primary type
  
  @param type
  The media type primary type
  @return a wildcard media type for the given primary type
  @throws NullPointerException
  if the type is null
  @throws IllegalArgumentException
  if the specified type is not valid