code: public static boolean isWildcardType(final MediaType mediaType) {
  		requireNonNull(mediaType,MEDIA_TYPE_CANNOT_BE_NULL);
  		return WILDCARD_TYPE.equals(mediaType.type());
  	}
docs: Indicates whether the {@linkplain MediaType#type() type} is the
  wildcard character <code>&#42;</code>.
  
  @param mediaType
  the instance to verify
  @return whether the type of the specified instance is a wildcard
  @throws NullPointerException
  if the specified instance is null