Glassfish Java App Class cast exception

Question

Getting the following exception when casting

fqe.dataHandler.LiveUpdateMessage cannot be cast to fqe.dataHandler.LiveUpdateMessage

Sometimes it happens, sometimes it doesn't. The object can never be anything other than that class.

If it helps this is when getting the Object from grizzly-comet's CometEvent.message() function on GlassFish 3.

Thanks in advance for any help.