Re: [paho-dev] NPE thrown by MqttAndroidClient without any boject set to

[Sergio Torassa <sertorassa@xxxxxxxxxxx>]

Does anyone know  what could be the reason of the NPE?

I also made another try using the same identical code but replacing MqttAndroidClient with MqttClient and everything works fine.

Debugging the code I found that the mqttService is null in MqttAndroidClient when the mqttService.publish(..) method is called.

---

Da: Sergio Torassa <sertorassa@xxxxxxxxxxx>
Inviato: sabato 6 maggio 2017 16.19
A: paho-dev@xxxxxxxxxxx
Oggetto: Re: [paho-dev] NPE thrown by MqttAndroidClient without any boject set to null

 

I tried creating a brand new project in AndroidStudio and the result is the same: NPE in the publish method

In the gradle.build config the versions of MQTT are:

serviceVersion = '1.1.1'
clientVersion = '1.1.0'

This is the excerpt for the connection, which works without catching any Exception

MqttConnectOptions mqttConnectOptions = new MqttConnectOptions();
mqttConnectOptions.setCleanSession(false);

try {

    mqttAndroidClient.connect(mqttConnectOptions, null);

} catch (MqttException ex){
    ex.printStackTrace();
}

---

Da: Sergio Torassa <sertorassa@xxxxxxxxxxx>
Inviato: martedì 2 maggio 2017 11.28
A: paho-dev@xxxxxxxxxxx
Oggetto: Re: [paho-dev] NPE thrown by MqttAndroidClient without any boject set to null

 

Hi James,

this is the result in logcat of e.printStackTrace()

java.lang.NullPointerException

     at org.eclipse.paho.android.service.MqttAndroidClient.publish(MqttAndroidClient.java:812)

     at org.eclipse.paho.android.service.MqttAndroidClient.publish(MqttAndroidClient.java:668)

     at com.storassa.android.giulia.MainActivity.onCreate(MainActivity.java:54)

     at android.app.Activity.performCreate(Activity.java:5275)

     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)

     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2166)

     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2252)

     at android.app.ActivityThread.access$800(ActivityThread.java:139)

     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1200)

     at android.os.Handler.dispatchMessage(Handler.java:102)

     at android.os.Looper.loop(Looper.java:136)

     at android.app.ActivityThread.main(ActivityThread.java:5103)

     at java.lang.reflect.Method.invokeNative(Native Method)

     at java.lang.reflect.Method.invoke(Method.java:515)

     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:788)

     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:604)

     at dalvik.system.NativeStart.main(Native Method)

Just to add a piece of info, I connected the client with a simple call to MqttAndroidClient.connect().

---

Da: paho-dev-bounces@xxxxxxxxxxx <paho-dev-bounces@xxxxxxxxxxx> per conto di James Sutton1 <james.sutton@xxxxxxxxxx>
Inviato: martedì 2 maggio 2017 10.20
A: paho-dev@xxxxxxxxxxx
Oggetto: Re: [paho-dev] NPE thrown by MqttAndroidClient without any boject set to null

 

Hi Sergio, 

 

Could you provide the stack trace please, It might help with identifying the cause.

 

Kind regards,

 

James Sutton
Software Engineer - IoT Foundation - MQTT Open Source Projects
Ops Team - Wimbledon Project

Phone: 01962 815438 | Extension: x372454 E-mail: james.sutton@xxxxxxxxxx Personal Website: www.jsutton.co.uk Find me on:	Hursley Park Hursley, SO212JN United Kingdom

 

IBM United Kingdom Limited Registered in England and Wales with number 741598 Registered office: PO Box 41, North Harbour, Portsmouth, Hants. PO6 3AU

 

 

----- Original message -----
From: Sergio Torassa <sertorassa@xxxxxxxxxxx>
Sent by: paho-dev-bounces@xxxxxxxxxxx
To: General development discussions for paho project <paho-dev@xxxxxxxxxxx>, "ingeniero@xxxxxxxxxxxxxxxxxxx" <ingeniero@xxxxxxxxxxxxxxxxxxx>
Cc:
Subject: Re: [paho-dev] NPE thrown by MqttAndroidClient without any boject set to null
Date: Mon, May 1, 2017 7:40 PM
 

I forgot to mention that also topic is not null. It is a string

Il 01/mag/2017 20:01, Manuel Domínguez Dorado <manolodd@xxxxxxxxx> ha scritto:
>
> What about publishTopic?
>
> Perhaps this is null.
>
> 2017-05-01 19:26 GMT+02:00 Sergio Torassa <sertorassa@xxxxxxxxxxx>:
>>
>> Hello all
>>
>>
>> I'm trying to develop a very simple Android app based upon MQTT.
>>
>> Just from the beginning I started with an NPE thrown by MqttAndroidClient.publish(String topic, MqttMessage message) method.
>>
>>
>> This is the excerpt of the code where the NPE is thrown:
>>
>>
>> try {
>>     MqttMessage msg = new MqttMessage("test".getBytes());
>>     mqttAndroidClient.publish(publishTopic, msg);
>> } catch (Exception e) {
>>     throw new RuntimeException(e);
>> }
>>
>> I checked both mqttAndroidClient and msg and neither of them are null.
>>
>> From the MQTT documentation MqttAndroidClient.publish() method is not supposed to throw a NPE.
>>
>> What could be the reason for that?
>>
>>
>> Thanks
>>
>> Sergio
>>
>>
>> _______________________________________________
>> paho-dev mailing list
>> paho-dev@xxxxxxxxxxx
>> To change your delivery options, retrieve your password, or unsubscribe from this list, visit
>> https://dev.eclipse.org/mailman/listinfo/paho-dev
>
>
>
>
> --
> ---
> Manuel Domínguez Dorado
> Software engineer (Ph.D, M.Sc., B.Sc.)
> Certified Project Management Professional (PMP)
> ingeniero@xxxxxxxxxxxxxxxxxxx
> http://www.ManoloDominguez.com
> (+34) 607 418 760
>

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