NonStop Servlets for JavaServer Pages (NSJSP) 6.1 System Administrator's Guide

Introduction to NSJSP

NonStop Servlets for JavaServer Pages (NSJSP) 6.1 System Administrator’s Guide—596210-006

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Apache Tomcat Components

The connector validates an incoming message from the web client or the web server

for compliance with the respective protocol, such as, HTTP /1.1 or AJP1.3.

Subsequently, it creates and allocates a thread for processing the message. The

message is then passed to the Catalina component for processing. Each message is

processed in a dedicated thread for the duration of message processing.

Catalina processes each request and further invokes a chain of configured Catalina

components, such as, the Engine, a Host, and Valves until the request has been

completely processed. Catalina loads all deployed web applications upon server

startup, maintains a distinct context for each web application that is deployed,

maintains all the resources for each web application, prevents unauthorized access of

resources, maintains the state of each web application stored in sessions, and

provides security to the web applications.

After a message is processed by Catalina, Coyote returns the message response

using the configured protocol, such as, HTTP/1.1 or AJP1.3, and sends the data to the

Figure 1-8. Apache Tomcat with the Apache Web Server

Network

Apache

To m c a t

Catalina Container

(Servlet/JSP Container)

AJP Connector

Connector

threads

HTTP/1.1