java packages and (web)applications

[CapsLoc]

Hello,

I am very new to the java programming language, java servlets is perhaps even more confusing to me. So I'm hoping my explanation will make some sense.

I have set up a server through Terminal (/Command Prompt), more specifically the Mobicents Sip Server. And to test this server Mobicents provided a sample application 'click-to-call' (which can be accessed through localhost:8080/click2call/ when the server has been started). The WEB-INF directory of this directory contained four java classes, two of which are called SimpleWebServlet and SimpleSipServlet (the code can be found here: http://www.google.com/codesearch#NmC...s_navigation=1).

I am a bit confused how these classes are being used upon running the (web)application, as they are part of a package.

Also, does the SimpleWebServlet correspond to the web application and the SimpleSipServlet to the (SIP) server I started? Or what is the appropriate way I should address these two classes?

Thanks in advance.

[Tolls]

Is there a web.xml file in the WEB-INF directory?
This is where the mapping of the servlet to a URL is done, so the server knows that click2call/SimpleWeb maps to SimpleWebServlet, for example.

[CapsLoc]

Hello,

thank you for your reply.

Indeed, there is a web.xml file:

<?xml version="1.0" encoding="iso-8859-1" ?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4">
    <display-name>Click To Call</display-name>
    <description>Simple Converged Sip Servlet Demo</description>
    <servlet>
        <servlet-name>ClickToCall</servlet-name>
        <servlet-class>org.mobicents.servlet.sip.example.SimpleWebServlet</servlet-class>
        <load-on-startup>1</load-on-startup>        
    </servlet>
    <servlet-mapping>
        <servlet-name>ClickToCall</servlet-name>
        <url-pattern>/call</url-pattern>
    </servlet-mapping>
</web-app>

so it's the part between <servlet-class> that informs the server it should deploy the simplewebservlet when visiting the url? Or is it related to the <url-pattern>?

[Tolls]

The url-pattern maps the url to a servlet-name.
The servlet-name maps the name to an actual class.
So it needs both to go from the url to your actual class.