Q:

app-engine iOS push notification exception: "The specified queue is unknown"

I am using the Google Sample project to setup push notification on my app-engine backend.  The following method is throwing an exception
private static void enqueuePushAlertToDevices(String alertMessage, String devicesAsJson) {
    Queue notificationQueue = QueueFactory.getQueue("notification-delivery");
    notificationQueue.add(TaskOptions. Builder.withMethod(TaskOptions. Method. PULL)
        .param("alert", alertMessage)
        .param("devices", devicesAsJson));
}

And the exception is
com.google.api.server.spi. SystemService invokeServiceMethod: The specified queue is unknown : notification-delivery
java.lang. IllegalStateException: The specified queue is unknown : notification-delivery
    at com.google.appengine.api.taskqueue. QueueApiHelper.translateError(QueueApiHelper.java:104)
    at com.google.appengine.api.taskqueue. QueueImpl$2.wrap(QueueImpl.java:552)
    at com.google.appengine.api.taskqueue. QueueImpl$2.wrap(QueueImpl.java:521)
    at com.google.appengine.api.utils. FutureWrapper.wrapAndCache(FutureWrapper.java:55)
    at com.google.appengine.api.utils. FutureWrapper.get(FutureWrapper.java:92)
    at com.google.appengine.api.utils. FutureWrapper.get(FutureWrapper.java:88)
    at com.google.appengine.api.taskqueue. QueueApiHelper.getInternal(QueueApiHelper.java:72)
    at com.google.appengine.api.taskqueue. QueueImpl.add(QueueImpl.java:413)
....

Given that the project has been around, I imagine a number of developers have been using it.  So where should I define the queue "notification-delivery"?  I understand the problem: I am using a queue that is not yet defined.  But it's not clear to me where I should define it.  I haven't found an answer in the sample code as yet.  Thanks. 

A:

You didn't look hard enough :).  Actually it's not obvious.  Just copy the queue.xml from the sample into your project.  The path in the sample is
/Downloads/solutions-ios-push-notification-sample-backend-java-master/war/WEB-INF

