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Date: Fri, 29 Nov 2013 16:45:24 -0800 (PST)
From: Brian Reinhold <brianreinhold@lampreynetworks.com>
To: users@activemq.apache.org
Message-ID: <1385772324127-4674960.post@n4.nabble.com>
Subject: Apollo MQTT server throws a null pointer exception on disconnect
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I have established a connection to an embedded running of the MQTT server and
am able to publish and subscribe to messages from the remote client side.
However, when I invoke an MqttClient.disconnect() from the client side
(using the paho MqttClient) I get the following message from the MQTT server

Exception in thread "hawtdispatch-DEFAULT-3" java.lang.NullPointerException
	at
org.apache.activemq.apollo.mqtt.MqttSession$18$1.run(MqttSession.java:636)
	at
org.fusesource.hawtdispatch.internal.SerialDispatchQueue.run(SerialDispatchQueue.java:100)
	at
org.fusesource.hawtdispatch.internal.pool.SimpleThread.run(SimpleThread.java:77)

If I simply terminate the client application I get no such message.

The setup of the client side connection is as follows:
                mqttServerUrl = "ssl://localhost:8445";
                mqttClient = new APSMqttClient(mqttServerUrl,
aps.getClientId(), "./AhdMqttPersistentData");
               
mqttClient.setConnectionUserNameAndPassword(aps.getClientId(),
aps.getAHDCredential());
                mqttClient.SetCallback(new AhdMqttCallback());

                // This sets the WILL parameters to send "LOST" on the
payload, QoS = 2, retain message,
                // no clean session, topic is a status message. Publishing
on the topic in the code works okay.
                mqttClient.setConnectionQos(2,
aps.generateStatusTopicString());
                mqttClient.setConnectionKeepAliveTime(20); // seconds
                mqttClient.setConnectionTLS(new
HttpRest().getSSLSocketFactory());
                if(mqttClient.connect())

Has anyone had problems with the disconnect() of the MQTT server?


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