A problem when using Sun One to create a Servlet?

I have the Sun One Application Server installed on my computer. I used the Sun One Studio to create my first Servlet: HelloServlet. The steps are as following:
1)First, the filesystem I mounted on Sun One Studio is:
D:\myProgram\John\JohnEJB1.
2)Then I created a folder(or package) under it, it�s called client. I created a html file, hello.html under this client folder, which will call a servlet later. Immediately, I transferred this client folder to a Web Module. So there is a WEB-INF under the D:\myProgram\John\JohnEJB1 in the Sun One Studio. This WEB-INF of course has one classes folder and one lib folder.
3) Under this classes folder, which is used to save all the Servlet classes, I put my HelloServlet.java.
4) in the web.xml, I put the following:
<servlet>
<servlet-name>MyHello</servlet-name>
<display-name>MyHello</display-name>
<servlet-class>samServlet. HelloServlet </servlet-class>
</servlet>
<servlet-mapping>
<servlet-name> MyHello </servlet-name>
<url-pattern>/samTest</url-pattern>
</servlet-mapping>
5) Again, in the html file hello.html mentioned earlier, I put the Action like this: <FORM METHOD="GET" ACTION="/samTest">
6) Finally, I deployed this WEB-INF to the Sun One Application Server.
But when I went to the url: http://localhost: 80/client/hello.html to test it, when I clicked the Form Button, in other words, when the html file called the Servlet, it failed. It reported some error like NoClassDefFoundError.
Anyone who can point out which part was wrong here? I know it�s a very basic problem. So I really appreciate your help.

The classes folder should contain class files, not java files.

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