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.

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