* Service (STS) with the long lived AWS credentials. This class then vends
* the short lived session credentials sent back from STS.
*/
private void startSession() {
GetSessionTokenResult sessionTokenResult = securityTokenService
.getSessionToken(new GetSessionTokenRequest().withDurationSeconds(DEFAULT_DURATION_SECONDS));
Credentials stsCredentials = sessionTokenResult.getCredentials();
sessionCredentials = new BasicSessionCredentials(
stsCredentials.getAccessKeyId(),
stsCredentials.getSecretAccessKey(),