Running servlets in tomcat server

Hi,
I am not able to execute servlets in tomcat,
When i executed the program html file was running perfectly and when i click on the submit button it is displaying the following error
type Status report
message ServletCalled.class
description The requested resource (ServletCalled.class) is not available.
I followed the below procedure
I created a new directory in webapps "webapps/test".
Test directory contains
1. callservlet.html file
2. another directory Web-inf (i.e, webapps/test/Web-inf)
Web-inf directory contains
1. web.xml file
2. another directory classes (i.e, webapps/test/Web-inf/calsses)
classes directory contains
1. ServletCalled.class file
Html file code
callservlet.html
<html>
<body>
<form method=post action="/ServletCalled/ServletCalled.class">
<input type=submit value="submit">
</form>
<body>
</html>
servlet file
ServletCalled.java contains
public void doPost(HttpServletRequest req,HttpServletResponse res ){
java.io.PrintWriter out = req.getWriter();
out.println("Hi, executed");
web.xml file
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web
Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
<servlet-name>ServletCalled</servlet-name>
<servlet-class>ServletCalled</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ServletCalled</servlet-name>
<url-pattern>/ServletCalled</url-pattern>
</servlet-mapping>
</web-app>
i used all the options above i changed the <url-pattern> and form tag to (<form action="/ServletCalled" method=get>)but same error persists
Please help me out in this thanks in advance

thanks !! i got the solution

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How to run servlets in tomcat

Hi ,
How to run servlets in tomcat server. I created two files html and servlet file.
Html file
callservlet.html
<html>
<body>
<form method=post action="servletcalled.class">
<input type=submit value="submit">
</form>
<body>
</html>
servlet file
servletcalled.java contains
public void doPost(HttpServletRequest req,HttpServletResponse res ){
java.io.PrintWriter out = req.getWriter();
out.println("Hi, executed");
i put the callservlet.html in webapps/examples/ and servletcalled.class was in webapps/examples/Web-inf/classes/
After starting the tomcat and running the program html file is getting exceuted but when i click on the submit button this error is prompted
type Status report
message servletcalled.class
description The requested resource (servletcalled.class) is not available.
Thanks in advance

Thanks,
I created a new directory in webapps
s "webapps/test".
Test directory contains
1. callservlet.html file
2. another directory Web-inf (i.e,
webapps/test/Web-inf)
Web-inf directory contains
1. web.xml file
2. another directory classes (i.e,
webapps/test/Web-inf/calsses)
classes directory contains
1. servletcalled.class file
web.xml file contains
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web
Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
<servlet-name>Example</servlet-name>
<servlet-class>Example</servlet-class>
</servlet>
</web-app>
-->should be: <servlet-class>servletcalled</servlet-called>
then in the <web-app> scope define this:
<servlet-mapping>
<servlet-name>Example</servlet-name>
<url-pattern>/servlets/Example</url-pattern>
</servlet-mapping>
>
thanks in advance i am working hard on that but
notable to get the solutionbtw by reading the documentation of tomcat and tutorials of jave on the java site (here), you would have known this!

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Thanx a lot for ur promt reply.
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message
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exception
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type Exception report
message Internal Server Error
description The server encountered an internal error (Internal Server Error) that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Cannot allocate servlet instance for path /servlet/Servlet1
     at org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:419)
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     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
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     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
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     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
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     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
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     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
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     at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1027)
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