Why Firebase JobDispatcher run JobService 2 times?

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As From Firebase JobDispatcher Documentation Firebase JobDispatcher

setTrigger(Trigger.executionWindow(0, 60))
// start between 0 and 60 seconds

but why my sevice running two time

Firebase JobDispacther Code

    FirebaseJobDispatcher dispatcher = new FirebaseJobDispatcher(new GooglePlayDriver(this));
    Job job = dispatcher.newJobBuilder()
            .setTag("testing job")
            .setService(TestingJob.class)
            .setReplaceCurrent(true)
            .setRecurring(true)
            .setTrigger(Trigger.executionWindow(0,1))
            .setConstraints(Constraint.ON_ANY_NETWORK)
            .setLifetime(Lifetime.FOREVER)
            .build();

    dispatcher.mustSchedule(job);

Testing class (Job Service)

public class TestingJob extends JobService {

    private static final String TAG = "TestingJob";
    private int i =0;
    @Override
    public boolean onStartJob(JobParameters job) {

        Log.d(TAG, "onStartJob Testing Job: "+new Date().toString());
        Log.d(TAG, "onStartJob: i = "+String.valueOf(i));
        i+=1;
        return false;
    }

    @Override
    public boolean onStopJob(JobParameters job) {

        Log.d(TAG, "onStopJob Testing Job: Stopped");
        return false;
    }
}

Log Cat

11-28 00:08:57.666 11793-11793: onStartJob Testing Job: Tue Nov 28 00:08:57 GMT+05:00 2017
11-28 00:08:57.666 11793-11793: onStartJob: i = 0
11-28 00:08:57.791 11793-11793: onStartJob Testing Job: Tue Nov 28 00:08:57 GMT+05:00 2017
11-28 00:08:57.791 11793-11793: onStartJob: i = 0

Manifest

   <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <service android:name=".services.TestingJob"
            android:exported="false">
        <intent-filter>
            <action android:name="com.firebase.jobdispatcher.ACTION_EXECUTE"/>
        </intent-filter>
    </service>

Can i use my Job Service Again mean int i should increment every time.

Thnx For Your Help

3 Answers
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