Re: [paho-dev] Null Pointer exception.- Attempt to invoke virtual method

[Benjamin Cabé <benjamin.cabe@xxxxxxxxxxxxxxxxxxxxxx>]

It looks like aBrokerUrl might be null? Are you sure it is effectively initialised? And if yes, what is the form of that URI you are passing? For a TSL socket it should be starting with "ssl://"

Benjamin -

Le 25 oct. 2017 à 12:33, Sumayya Shahzad <sumayya@xxxxxxxxxxxxxx> a écrit :

Hi,

I have developed an android application which connects to MQTT server on tls/ssl. 

There is one MQTTSubscriber class. 

MQTTSubscriber works great on wi-fi connections but when connecting with ActiveMQ (ver 5.14.3) using MQTT Library ver 3 it throws the following exception. I am using Android ver 7.0 on LG G6.

The exception is as follows:

AlertMqttSubscriber , java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference

at java.net.URI$Parser.parse(URI.java:3050)

at java.net.URI.<init>(URI.java:590)

at org.eclipse.paho.client.mqttv3.MqttConnectOptions.validateURI(MqttConnectOptions.java:528)

at org.eclipse.paho.client.mqttv3.MqttAsyncClient.<init>(MqttAsyncClient.java:463)

at org.eclipse.paho.client.mqttv3.MqttAsyncClient.<init>(MqttAsyncClient.java:328)

at org.eclipse.paho.android.service.MqttConnection.connect(MqttConnection.java:289)

at org.eclipse.paho.android.service.MqttService.connect(MqttService.java:329)

at org.eclipse.paho.android.service.MqttAndroidClient.doConnect(MqttAndroidClient.java:467)

at org.eclipse.paho.android.service.MqttAndroidClient.access$200(MqttAndroidClient.java:76)

at org.eclipse.paho.android.service.MqttAndroidClient$MyServiceConnection.onServiceConnected(MqttAndroidClient.java:115)

at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1535)

at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1563)

at android.os.Handler.handleCallback(Handler.java:751)

at android.os.Handler.dispatchMessage(Handler.java:95)

at android.os.Looper.loop(Looper.java:154)

at android.app.ActivityThread.main(ActivityThread.java:6316)

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

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:872)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762)

The Java code for respective exception is as follows:

mySSLContext.init(null, myWrappedTrustManagers, null);
// Create SSLSocketFactory
SSLSocketFactory myFactory = mySSLContext.getSocketFactory();
MqttConnectOptions myOptions = new MqttConnectOptions();
myOptions.setCleanSession(false);
myOptions.setAutomaticReconnect(true);
myOptions.setKeepAliveInterval(Constant.KEEP_ALIVE_INTERVAL);
myOptions.setSocketFactory(myFactory);
theMQTTClient = new MqttAndroidClient(this.theContext,aBrokerUrl,aDeviceId);
IMqttToken token = theMQTTClient.connect(myOptions);
Exception e =token.getException();
token.setActionCallback(new IMqttActionListener() {
    @Override
    public void onSuccess(IMqttToken asyncActionToken) {
        try {
            //logging connection status = true
            ArrayList<String> myTopicName = getTopicName(aContext);
            for (int topicName=0;topicName<myTopicName.size();topicName++) {
                theMQTTClient.subscribe(myTopicName.get(topicName), 1);
            }
        } catch (MqttException exception) {
            //logging exception
        }
    }

    @Override
    public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
     //logging exception
    }
});
theMQTTClient.setCallback(new MqttCallback() {
    @Override
    public void connectionLost(Throwable cause) {
        //logging exception
    }

Can anyone guide me a little more about it. What would be the reason why I am getting such exception and h

how can these be handled or removed?

Kind Regards,

Sumayya Shahzad

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