Tomcat 7 jsp/DAO Problems

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1

I am using tomat 7.0.8. I am trying to access basic information in a database using the DAO (direct access object) design pattern. The problem I am having is that the data shows fine when I use a servlet. However, when trying to use a jsp file (which is preferred) I get an error that says the DAO object is not a recognized type. Here are the details:
Working Servlet:


import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;



public class ShowQuestions extends HttpServlet
{
	public void service(HttpServletRequest req, HttpServletResponse res)
	throws ServletException, IOException
	{
		try
		{
		 
		 BrainDAO dao = BrainDAO_Concrete.getBrainDAO();
		 ArrayList questions = dao.getQuestions(1,1); 
		 
		 Questions questionAndAnswers;
		
		
		res.setContentType("text/html");
		
		String html = "<html>";
		       html += "<head><title>Form Output</title></head>";
			   html +="<body>";
			   html +="<h3>Questions</h3>";
			 
			  for (Iterator i = questions.iterator(); i.hasNext();) 
			   {  
					questionAndAnswers = (Questions)i.next();
			   html+= "Question is : " +	questionAndAnswers.getQuestion() + "<br />";
			   html += "A " + questionAndAnswers.getAnswerW1() + "<br />";
			   html += "B " + questionAndAnswers.getAnswerW2() + "<br />";
			   html += "C " + questionAndAnswers.getAnswerW3() + "<br />";
			   html += "D " + questionAndAnswers.getAnswerR() + "<br />";
			   }
			   
			   html += "</body></html>";
			   
			   res.getWriter().println(html);
		}
		catch(IOException sqle) {
            System.out.println(sqle);
        }
		catch(ClassNotFoundException cnfe) 	{
            System.out.println(cnfe);
        }
		catch(SQLException sqle) {
            System.out.println(sqle);
        }   
			   
	}
}

Jsp That does not work


<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*, java.util.*, java.io.*" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Questions JSP</title>
</head>

<body>
   <%
		try
		{
		 BrainDAO dao = BrainDAO_Concrete.getBrainDAO();
		 ArrayList questions = dao.getQuestions(1,1); 
   %>

<table><tr><td><b>Question</b></td><td><b>Ans1</b></td><td><b>Ans2</b></td><td><b>Ans3</b></td><td><b>Ansr</b></td></tr>

  <%	
	Questions questionAndAnswers;
	 for (Iterator i = questions.iterator(); i.hasNext();) 
			   {  
					questionAndAnswers = (Questions)i.next();
  %>
	<tr><td>
		<%=questionAndAnswers.getQuestion() %>
	</td><td>
		<%=questionAndAnswers.getAnswerW1()%>
	</td><td>
		<%=questionAndAnswers.getAnswerW2()%>
	</td></tr>	
    	<%=questionAndAnswers.getAnswerW3()%>
	</td></tr>	
   	 	<%=questionAndAnswers.getAnswerR()%>
	</td></tr>	
 <%			 } //end of iteration
		}//end of try block
		
		catch(IOException sqle) 
		{
            System.out.println(sqle);
        }
		catch(ClassNotFoundException cnfe) 	
		{
            System.out.println(cnfe);
        }
		catch(SQLException sqle) 
		{
            System.out.println(sqle);
        }   

 %>

</table>
</body>
</html>

Up to this point I have not been using Ant or any kind of deployment software. I manually created my root folder brain(C:\Tomcat7.0\webapps\brain) and in it are my jsp files. The WEB-INF folder that has the classes folder, in which are all the classes, is also in brain.(C:\Tomcat7.0\webapps\brain\WEB-INF\classes). To ensure clarity here is the main part of the error message that Tomcat spits out:


org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 13 in the jsp file: /questions.jsp
BrainDAO cannot be resolved to a type
10:    <%
11: 		try
12: 		{
13: 		 BrainDAO dao = BrainDAO_Concrete.getBrainDAO();
14: 		 ArrayList questions = dao.getQuestions(1,1); 
15:    %>
16:
2

First, DAO is Data Access Object.

Second, Servlets and JSP’s do not substitute each other. Meaning that you should use both Servlets and JSP’s together. My guess is that you’re lacking the following knowledge

  1. Scope (Request/Session/Application)
  2. When you should use Servlets and JSP’s.

I advise that you learn those and you should figure out the answer.