Servlet basic example

[adammyth]

Hi,

i am very new on J2EE and trying to learn servlets by following an example described in this link: Server-side Java: Understanding JavaServer Pages Model 2 architecture - JavaWorld

Unfortunately i am not able to make the example work, i am getting HTTP Status 404 error: The requested resource (/shopping/ShoppingServlet) is not available.

I am using Tomcat.
My directory structure is as follows:

WebContent/EShop.jsp
WebContent/Cart.jsp
WebContent/WEB-INF/classes/shopping/ShoppingServlet.class
WebContent/WEB-INF/classes/shopping/CD.class
WebContent/META-INF

And web.xml which is automatically created by eclipse is as follows :

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" 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">
<display-name>WebDev_2</display-name>
<servlet>
<description>
</description>
<display-name>ShoppingServlet</display-name>
<servlet-name>ShoppingServlet</servlet-name>
<servlet-class>
shopping.ShoppingServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ShoppingServlet</servlet-name>
<url-pattern>/ShoppingServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>


What is the problem here?

[FON]

Hi,

Unfortunately i am not able to make the example work, i am getting HTTP Status 404 error: The requested resource (/shopping/ShoppingServlet) is not available.


...
<servlet-mapping>
<servlet-name>ShoppingServlet</servlet-name>
<url-pattern>/ShoppingServlet</url-pattern>
</servlet-mapping>
...
</web-app>


What is the problem here?

Be sure your URL mapping is correct.

Try like:
http://localhost:8080/application_name/ShoppingServlet

Are you getting any info from servlet?

[adammyth]

When i try with http://localhost:8080/WebDev_2/ShoppingServlet

i get the following error:

HTTP Status 405 - HTTP method GET is not supported by this URL

How can i be be sure that my URL mapping is correct?

[FON]

In your form :

...

<form name="shoppingForm" 
   action="[B]/examples/servlet/ShoppingServlet"[/B] 
   method="POST">

...

So there is POST not GET and path is
/examples/servlet/ShoppingServlet
not just
/ShoppingServlet


Open ShoppingServlet.java code, find doGet() method and add some
test to console with some
System.out.println("Hi from doGet() !");
just to test it.

So while trying to solve that url mapping
run ShoppingServlet directly
and see if you can hit that doGet() you added and message in console.
That's easiest way to test in whenever you make it.
So first test GET that you make and then test post from that form.

still got problems?