NPE

[pixnbit]

                                                                        Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference
                                                                           at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:772)
                                                                           at org.eclipse.paho.android.service.MqttService.getConnection(MqttService.java:560)
                                                                           at org.eclipse.paho.android.service.MqttService.isConnected(MqttService.java:407)
                                                                           at org.eclipse.paho.android.service.MqttAndroidClient.isConnected(MqttAndroidClient.java:245)

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• Bug exists Release Version 1.1.0 (Java Repository Master Branch)
• Bug exists in Snapshot Version 1.1.1-SNAPSHOT (Android Service Repository Master Branch)
• Bug is just in the Sample Application.

Android API Version Bug Seen on:

Android Version Bug Seen on:

Please also check that if you have found the bug in the Release version (1.1.0) that you check that it also exists in the Snapshot (1.1.1-SNAPSHOT) before raising a bug.

Description of Bug:

E.g. Steps to re-create, how often does this happen etc..

Console Log output (if available):

[jpwsutton]

@laoyang Are you able to duplicate this in the SNAPSHOT build? And do you have any steps to recreate?

[jpwsutton]

Closing as no response since 2016. Though It looks like the cause of this was that the clientHandle was null when attempting to get the connection, PR #263 adds a null check which will return a more human readable error in this scenario.

[Raja-Raman]

I observe this crash consistently as of July 2018:
Please suggest any work around.

Android SDK version 26, target version 26.

MqttAndroidClient client;
client.connect(..);
// do stuff
client.disconnect();
if (client==null)
return;
if (client.isConnected()) { /* crashes here */
// do stuff
}

The error message is:
07-13 23:45:53.445 5565-5565/com.raja.mqttsms1 W/System.err: java.lang.NullPointerException: Attempt to
invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:772)
at org.eclipse.paho.android.service.MqttService.getConnection(MqttService.java:560)
at org.eclipse.paho.android.service.MqttService.isConnected(MqttService.java:407)
at org.eclipse.paho.android.service.MqttAndroidClient.isConnected(MqttAndroidClient.java:245)
at com.raja.mqttsms1.MainActivity.connect(MainActivity.java:97)
at com.raja.mqttsms1.MainActivity.onResume(MainActivity.java:293)

[wv1124]

I observe this crash consistently as of July 2018: Please suggest any work around.

Android SDK version 26, target version 26.

MqttAndroidClient client; client.connect(..); // do stuff client.disconnect(); if (client==null) return; if (client.isConnected()) { /* crashes here */ // do stuff }

The error message is: 07-13 23:45:53.445 5565-5565/com.raja.mqttsms1 W/System.err: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:772) at org.eclipse.paho.android.service.MqttService.getConnection(MqttService.java:560) at org.eclipse.paho.android.service.MqttService.isConnected(MqttService.java:407) at org.eclipse.paho.android.service.MqttAndroidClient.isConnected(MqttAndroidClient.java:245) at com.raja.mqttsms1.MainActivity.connect(MainActivity.java:97) at com.raja.mqttsms1.MainActivity.onResume(MainActivity.java:293)

when disconect:

                mMqttClient.unsubscribe(this.topic);

// mMqttClient.disconnect();
mMqttClient.close();
mMqttClient.unregisterResources();
mMqttClient = null;
then isConnected() will not throw Invalid ClientHandle Exception