BANGALORE, INDIA: Combine JavaScript with Java code on the server to get the freedom to use the same JavaScript routines on both servers and clients.

In addition, the techniques presented throughout this series will allow you to maintain a single code base for both Ajax and non-Ajax clients.

Because much of the server-side code would still be written in the Java language, you'll find it necessary to expose the Java Platform, Enterprise Edition (Java EE) features to JavaScript. In this series, learn how to run JavaScript files on the server side, call remote JavaScript functions with Ajax, and use the Java Scripting API with the JavaServer Pages (JSP) technology.

Typical Ajax applications use JavaScript on the client side and a different language, such as Java, on the server side. As a result, developers must implement some of their routines twice, using JavaScript for the Web browser and another language for the server.

This double-coding issue can be avoided by using JavaScript combined with Java code on the server side, getting full support of scripting languages through the javax.script API. In addition, the Java SE Development Kit (JDK) 6 already includes Mozilla's Rhino JavaScript engine, which means no setup is required.

In this first article of the series, you will use a simple script runner that lets you execute JavaScript files within a Java EE application. Scripts will have access to the so-called "implicit objects" that are used in JSP pages, such as application, session, request, and response. Most of the samples consist of reusable code so that you can easily start using JavaScript on the server in your own applications.

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