NonStop Servlets for JavaServer Pages (NSJSP) 5.0 System Administrator's Guide

Overview and Architecture

NonStop Servlets for JavaServer Pages (NSJSP) System Administrator’s Guide—525644-003

1-11

An Example of JSP Code

Example 1-1 on page 1-11 shows the use of templating, a common technique used in

web-page development, which uses the services of more than one servlet. In this

example, the template is coded as JSP using the include directive to reference some

HTML in another file.

NonStop Servlets for JavaServer Pages

(NSJSP) Architecture

This subsection contains background information about the NonStop Servlets for

JavaServer Pages (NSJSP) architecture. It illustrates and discusses the relationships

between HTML clients, iTP Secure WebServer processes, and the NSJSP

environment. It also describes the lifecycle of a servlet and the benefits of running

servlets in NonStop TS/MP ServerClasses.

The NSJSP implementation is a multi-threaded, out-of-process servlet container: a

Java web container (with web applications) that runs in a Java Virtual Machine (JVM)

outside of the iTP Secure WebServer HTTPD process. This architecture is shown in

Figure 1-5, iTP Secure WebServer Servlet Architecture, on page 1-12.

In essence, NSJSP provides the same JVM functionality as any other J2EE

implementation, but is unique in its ability to scale across multiple processors to

provide a scalable NSJSP computing environment.

Each web container can contain a number of applications, each with their own servlets,

JSP, and other resources. These containers are accessible by any HTTPD process

running on any processor. The containers and the HTTPD processes are part of the

NonStop TS/MP environment.

Example 1-1. JSP Code

<%-- Filename: "TemplateDemo.jsp" --%>

<HTML>

<BODY>

<CENTER> Welcome To My WebSite</CENTER>

<BR>

<%@ include file = "Body.html" %>

</BODY>

</HTML>

_____________________________________________________________________________

The HTML file called Body is:

<BR>

<H1>

This is text that will be included in the body of the HTML in the JSP file

</H1>

<BR>