Google project http://code.google.com/p/javapns/ for send ing push notifications.
Welcome to the JavaPNS project, home of the most user-friendly, powerful and fine-tuned Java library for APNS! This fully-featured Java library allows developers to push notifications to iOS devices (iPhone, iPod, iPad, etc.) through the Apple Push Notification Service using a simple yet powerful set of tools. First-time users will find the library to be extremely easy to use (start with a single line of code!), while advanced users will benefit from the library's flexible design and scalability features.