Re: [paho-dev] Callback exception

[Sergio Torassa <sertorassa@xxxxxxxxxxx>]

my 2c

If the exception had been thrown by observer, it would have been catched.
Are you sure it is not related to logger?

sergio

On 16/07/2015 15:42, Seif Eddine Jemli wrote:

Hi,

I am just calling a method on a non null object in that line.

@Override

public void messageArrived(String topic, MqttMessage message) throws Exception {

logger.debug(" Topic:" + topic + ("| Message: " + new String(message.getPayload())));

System.out.println("-------------------------------------------------");

System.out.println("| Topic:" + topic);

System.out.println("| Message: " + new String(message.getPayload()));

System.out.println("-------------------------------------------------");

try{

//notify the class responsible for the communication with A2NETS of the message sent by the agent

observer.update(message,topic);

}

catch(Exception e)

{

logger.info("-------------Exception dans appel méthode update " + e.getCause() );

}

}

I verified if the object observer is null, but it wasn't.

2015-07-16 10:10 GMT+02:00 Nicholas O'Leary <nick.oleary@xxxxxxxxx>:

Hi,

that is a NPE in code outside of the paho client:

   org.bull.a2nets.MyInterwokringProxy.broker.SimpleMqttClient.messageArrived(SimpleMqttClient.java:197)

You should look at that code first to see what is throwing the null pointer.

NIck

On 16 July 2015 at 09:03, Seif Eddine Jemli <seifeddinejemli@xxxxxxxxx> wrote:

I am using eclipse.paho as a client. I get these errors when I publish a message on a topic that my client is subscribed to.

 DEBUG [org.eclipse.paho.client.mqttv3.internal.CommsCallback]: a/topic: callback threw exception
    java.lang.NullPointerException
            at org.bull.a2nets.MyInterwokringProxy.broker.SimpleMqttClient.messageArrived(SimpleMqttClient.java:197)
            at org.eclipse.paho.client.mqttv3.internal.CommsCallback.handleMessage(CommsCallback.java:354)
            at org.eclipse.paho.client.mqttv3.internal.CommsCallback.run(CommsCallback.java:162)

What can be the solution? thanks.

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