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I've found some interesting behavior... I can't decide if it's a bug or incompetence, but currently leaning towards incompetence. This code will not enter the loop, even if there are messages waiting: Message msg; while ((msg = consumer.receiveNoWait()) != null) { System.out.println(msg); } This code DOES enter the loop, notice the null assignment: Message msg = null; while ((msg = consumer.receiveNoWait()) != null) { System.out.println(msg); } This code is running on Glassfish 3.1.1b10 HotSpot 1.6_26 on Windows 32bit. I can't think of an explanation why the first block doesn't work! EDIT/UPDATE July 13, 2011: First, I began stopping the Glassfish domain and deleting it between deploys per request, and this still occurs :) Second, I cannot sync on Destination or Consumer, as this is Java EE code. But, I can assure there are messages available. There's about 500 of them available an no consumers. In fact, creating a QueueBrowser tells me there's messages available! Third, this program prints "WORKS!" every time!!! ARGH!!! public static void main(String[] args) { Object obj; if ((obj = getNotNull()) != null) { System.out.println("worked!"); } else { System.out.println("failed!"); } } static Object getNotNull() { return new Object(); } Lastly, I was speaking about my own incompetence. ;)

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