J2EE applications are made up of components. A J2EE component is a self-contained functional software unit that is assembled into a J2EE application with its related classes and files and that communicates with other components. The J2EE specification defines the following J2EE components:

It is true that both servlets and JSP pages have many features in common, and can be used for serving up dynamic web content. Naturally, this may cause some confusion as to when to opt for one of the technologies over the other. Luckily, Sun's J2EE Blueprints offers some guidelines towards this.

According to the Blueprints, use servlets strictly as a web server extension technology. This could include the implementation of specialized controller components offering services like authentication, database validation, and so forth. It is interesting to note that what is commonly known as the "JSP engine" itself is a specialized servlet running under the control of the servlet engine. Since JSP only deals with textual data, you will have to continue to use servlets when communicating with Java applets and applications.

The Java Developer Connection (JDC) presents a Short Course on the Fundamentals of Java Servlets written by Java Software licensee, the MageLang Institute. A leading provider of Java technology training, MageLang has contributed regularly to the JDC since 1996.

The MageLang Institute, since its founding in 1995, has been dedicated to promoting the growth of the Java technology community by providing excellent education and acting as an independent resource. To find out more about MageLang's Java technology training, visit the MageLang web site.

You should run Resin with -nojit, turning off the just-in-time compiler, when developing so you can see the proper line numbers. That alone will make development much easier.

Java VMs with just-in-time compilers (jits) compile Java bytecodes to machine code. This makes Java almost as fast as C, but removes all the line numbers. Running with -nojit will disable the compiler. When your code is completely debugged, you can run with the compiler enabled.

Our JSF tutorial comes with free source code and configuration files that makes JSF learning easy and fast. You can download all the codes in easy to use zip format from our website. In our JSF tutorials we will describe you how to implement all theoretical concepts of JSF in developing robust  JSF web application.

This JSF Tutorial contains readable and interesting content organized in proper and sequential manner. Each concept has been explained by simple examples so that you can understand easily and implement  immediately into your java web application. It provides coverage of key JSF concepts such as User Interface(UI) components, Renderers, Backing beans, Validators, Converters, Navigation, Event handling, Expession language, Messages  etc...