Iphone cannot receive push notification

I used Javapns to push notification to iphone, when i run the test applicaiton fist time, iPhone can receive the notification, but when i tried agian, no notication will be recieveed, about 20-40 minutes after i receive the notification, i tried again, 开发者_Go百科then i received it, doese any limitatoin on appler server that i can only send the notifiction after special interval?

JavaPNS was recently updated to 2.0, and fixed ALL reported issues up to the release date. I believe it fixes the issue you are reporting, as the problem being described seems to be caused by an un-closed or un-timed-out connection.