Github user gtully commented on a diff in the pull request: https://github.com/apache/qpid-jms/pull/10#discussion_r128774185 --- Diff: qpid-jms-client/src/main/java/org/apache/qpid/jms/provider/amqp/AmqpSaslAuthenticator.java --- @@ -137,7 +142,9 @@ private void handleSaslStep() throws JMSSecurityException { byte[] challenge = new byte[sasl.pending()]; sasl.recv(challenge, 0, challenge.length); byte[] response = mechanism.getChallengeResponse(challenge); - sasl.send(response, 0, response.length); + if (response != null) { --- End diff -- Thanks for the detailed feedback. will need to check if that can go, but I think not b/c it delegates to the saslclient which can return null. javax.security.sasl.SaslClient#evaluateChallenge
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