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General

Historically, the development of Ajax web applications has been a complex process. This is due mainly to the requirement to learn and use a variety of technologies, possibly including HTML, JavaScript, XML, ASP.NET, Java servlets, various scripting languages, etc.

Recently several products have emerged that make it possible to develop Ajax web applications using the Java development environment. Some use exclusively Java, while others use mainly Java.

The Google Web Toolkit (GWT)

One development environment that allows you to use mainly Java for the development of web applications is the Google Web Toolkit (GWT) (see Resources and Download).

Most of the client-side code for a GWT Ajax application can be written in Java.  There is no requirement to write JavaScript code.  However, it is necessary to:

• Create an HTML host page for the application.
• Create your own CSS style sheets.
• Compile your Java code using a special GWT Java-to-JavaScript compiler.
• Use a special scaled down version of the Java API, which only supports two packages from the standard J2SE API:
• java.lang
• java.util

Packages not fully supported

Even those two Java packages are not fully supported by the GWT.  For example, although the Vector class is supported by the GWT, only two overloaded constructors for that class are supported, whereas the Vector class in Sun's J2SE has four overloaded constructors.

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