how to set the class path variable in tomcat ?

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: /main2.jsp(9,0) The value for the useBean class attribute action.TestBean is invalid.
    org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
    org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
    org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
    org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1200)
    org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1160)
    org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2343)
    org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2393)
    org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2399)
    org.apache.jasper.compiler.Node$Root.accept(Node.java:489)
    org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2343)
    org.apache.jasper.compiler.Generator.generate(Generator.java:3372)
    org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:198)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:294)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:281)
    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.16 logs.

Apache Tomcat/6.0.16 jsp file

<html>
<head>
<title>Using JavaBeans in JSP</title>
</head>
<body>
<center>
<h2>Using JavaBeans in JSP</h2>

<jsp:useBean id="test" class="action.TestBean" />

<jsp:setProperty name="test" 
                    property="message" 
                    value="Hello JSP..." />

<p>Got message....</p>

<jsp:getProperty name="test" property="message" />

</center>
</body>
</html>

.class file is

/* File: TestBean.java */
package action;

public class TestBean {
   private String message = "No message specified";

   public String getMessage() {
      return(message);
   }
   public void setMessage(String message) {
      this.message = message;
   }
}

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