azure - Service bus QueueClient returns null brokered message even queue has thousands of messages -

i using service bus queue pass items producer consumer. producer able send items queue , consumer receiving correctly showing weird behavior receive method returns null (with no error) brokered message if queue has thousands of message. wrong queue?

one thing mention here in testing called close() method on queue. done once , while testing. every time run receive methods return null brokered message.

the messagecount can include messages sub-queues such dead-lettered , scheduled messages. if messages have expired have create receiver dead-lettered subqueue them.