parameter_absent problem was resolved. However, the occurrence of the problem is signature_invalid.
Error message : Authentication error: Unable to respond to any of these challenges: {oauth=WWW-Authenticate: OAuth oauth_problem=signature_invalid} java code : public String obtainAccessToken() throws Exception { try { oAuthAccessor.setProperty("oauth_verifier", params.getString ("oauth_verifier")); OAuthMessage oAuthMessage = oAuthClient.getAccessToken (oAuthAccessor, null, OAuth.newList(OAuth.OAUTH_VERIFIER, params.getString("oauth_verifier"), OAuth.OAUTH_TOKEN, params.getString ("oauth_token"))); return oAuthMessage.getParameter("xoauth_yahoo_guid"); } catch (OAuthProblemException problem) { log.error("obtainAccessToken OAuthProblemException error"); problem.printStackTrace(); log.error(problem); log.error(problem.getParameters().get(HttpMessage.RESPONSE)); throw new Exception("export.externemail.cannot.download"); } catch (Exception e) { log.error("obtainAccessToken Exception error"); e.printStackTrace(); log.error(e); throw new Exception("export.externemail.cannot.download"); } } Please help me. -- You received this message because you are subscribed to the Google Groups "OAuth" group. To post to this group, send email to oa...@googlegroups.com. To unsubscribe from this group, send email to oauth+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/oauth?hl=en.