The NetBeans IDE allows you to create, assemble, and debug code from a single, easy-to-use interface. The Platform Edition of the Application Server is bundled with the NetBeans 5.5 IDE. To download the NetBeans IDE, see http://www.netbeans.org. This site also provides documentation on how to use the NetBeans IDE with the bundled Application Server.
You can also use the Application Server with the Sun Java Studio 8 software, which is built on the NetBeans IDE. For more information, see http://developers.sun.com/prodtech/javatools/jsenterprise/.