Friday, 9 August 2013

AWS.SimpleQueueService.NonExistentQueue Exception thrown when Accessing Existing SQS queue

AWS.SimpleQueueService.NonExistentQueue Exception thrown when Accessing
Existing SQS queue

I am relatively new to AWS SQS services. I have written some code to wrap
the Amazon SQS api.
I am able perform basic functionality with created queues, but despite
that (in fact I have been using this code for ever with no problem, and I
am creating JUnit tests as a formality), I am failing my JUnit test
because of an error that makes little sense to me.
I have created a queue names SerenaQForTest using the AWS Management
console. When I look at the AWS Console I can see that the queue I have
created is listed. I have set the permissions on the queue to open for
everyone. I am coding in Java.
When I try to interact with the queue, I get an AmazonServiceException
with error code AWS.SimpleQueueService.NonExistentQueueerror.
Here is my code.
In the Junit Class:
/**
* Prefix for queues used to run junit tests.
*/
private static final String TESTQ = "SerenaForTest";
/**
* Ensures that the queue exists.
*/
@Test
public void testExists() {
System.out.println("JUnit Test EXISTS.");
CloudSQS cloudsqs = new CloudSQS();
// this queue does exist and i can see it through the aws management
console in sqs
assertTrue(cloudsqs.exists(TESTQ));
// this queue does not exist.
assertTrue(cloudsqs.exists("thisQDoesNotExist") == false);
}
and exists() is defined as follows:
/**
* Determines if the queue exists or not.
*
* @param qName
* , name of the queue to determine existence of.
* @return boolean, true if the queue exists; false otherwise.
*/
public boolean exists(final String qName) {
boolean retVal = false;
try {
// create a request for the url of qName
GetQueueUrlRequest getQueueUrlRequest = new
GetQueueUrlRequest(qName);
String addy = sqs.getQueueUrl(getQueueUrlRequest).getQueueUrl();
System.out.println(qName + " url : " + addy);
if (addy != null) {
// get all queues on sqs
ListQueuesResult queues = sqs.listQueues();
// for each url,
for (String url : queues.getQueueUrls()) {
// System.out.println("Comparing " + addy + " and " + url);
if (url.equalsIgnoreCase(addy)) {
System.out.println("Queue exists.");
retVal = true;
break;
}
}
} else {
System.out.println("Queue " + qName + " does not exist.");
}
} catch (AmazonServiceException ase) {
System.err.println("ERR: AmazonServiceException. Error code: " +
ase.getErrorCode());
} catch (AmazonClientException ace) {
System.err.println("ERR: AmazonClientException.");
ace.printStackTrace();
} catch (Exception e) {
System.err.println("ERR: Regular Old Error.");
e.printStackTrace();
}
return retVal;
}
Console Output:



JUnit Test EXISTS. SerenaForTest url :
https://sqs.us-west-2.amazonaws.com/079023477467/SerenaForTest Queue
exists. ERR: AmazonServiceException. Error code:
AWS.SimpleQueueService.NonExistentQueue
From that you can see that the function is able to grab the queue URL and
that a match is found. But it still throws an exception.
Any one have any ideas why this is happening? I call exists() every time I
need to throw something on or take something off of the queue so its
actually failing all of my JUnit tests but for the same reasons.
Thanks in advance!!!

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