code: public AccessTokenInfo validate(String accessToken) throws WebApplicationException
      {
          return validate(accessToken, null, null, null);
      }
docs: Validate an access token. This method is an alias of {@link
  #validate(String, String[], String)
  validate}<code>(accessToken, null, null)</code>.
  
  </p>
  When the given access token is not valid, this method throws a
  {@link WebApplicationException}. The response contained in the
  exception complies with the requirements described in <a href=
  "http://tools.ietf.org/html/rfc6750">RFC 6750</a> (The OAuth
  2.0 Authorization Framework: Bearer Token Usage).
  </p>
  
  @param accessToken
  An access token to validate.
  
  @return
  Information about the access token.
  
  @throws WebApplicationException
  The access token is invalid. To be concrete, the access
  token does not exist or it has expired.