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Modified Code Barn Simple MVC not works

Rajkumar balakrishnan

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posted 16 years ago

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Hi friends,

I copied the Code Barn SimpleMVC.war file and paste it to tomcat\web-apps\ and it works fine... Then i made some changes with the program and create a WAR file and paste it to webapps folder.. but now it shows error that

HTTP Status 404 - /SimpleMVC/

--------------------------------------------------------------------------------

type Status report

message /SimpleMVC/

description The requested resource (/SimpleMVC/) is not available.

--------------------------------------------------------------------------------

Apache Tomcat/6.0.16

Here is the modified code
--------------------------
ControllerServlet.java

package com.javaranch.codebarn.servlets;
 
import java.io.*;
 
import javax.servlet.*;
import javax.servlet.http.*;

/**
 * @author Ben Souther; ben@javaranch.com
 */
public class ControllerServlet extends HttpServlet
{
    public void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
        ModelBean modelBean = new ModelBean();
 
        modelBean.setuserName(request.getParameter("username"));
        modelBean.setpassword(request.getParameter("password"));
//        modelBean.setEmail(request.getParameter("email"));
        modelBean.setrole(request.getParameter("role"));
 
        request.setAttribute("modelBean", modelBean);
 
        getServletContext().getRequestDispatcher("/view.jsp").forward(request, response);
    }
 
    public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
        getServletContext().getRequestDispatcher("/view.jsp").forward(request, response);
    }
}

ModelBean.java

view.jsp

<html>
  <head>
    <title>Simple MVC</title>
  </head>
  <body>
    <h2>Simple MVC</h2>  
    <form method="post" action="simple-mvc">
      <table>
        <tr>
          <td>
            User Name:
          </td>
          <td>
            <input type="text" 
                   name="username" 
                   value="${modelBean.userName}" />
          </td>
        </tr>
        <tr>
          <td>
            Pass word:
          </td>
          <td>
            <input type="text" 
                   name="password" 
                   value="${modelBean.password}" />
          </td>
        </tr>
        
        <tr>
          <td>
            Role:
          </td>
          <td>
            <input type="text" 
                   name="role"
                   value="${modelBean.role}" />
          </td>
        </tr>
        <tr>
          <td>
            <input type="submit" name="enter_button" value="Enter" />
          </td>
          <td>
          </td>
        </tr>
      </table>
    </form>
    <pre>
      ${modelBean.message}
    <pre>
  </body>
</html>

What is the problem.. did i do any mistake? please help me get rid of this..

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Nickolas Case

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posted 16 years ago

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If Tomcat says it is unavailable, you may want to check your DD. That seems to be the most common fix for this issue.

Ben Souther

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posted 16 years ago

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You're not following the Javabean coding conventions (which is necessary for use with EL).

If you have a property named "thing", the setter should be spelled "setThing" and the getter should be spelled "getThing". Notice the capital "T".

When you use the EL expression ${modelBean.thing}, the JSP engine is going to add the "get" and capitalize the first letter, turning it into "getThing". Since Java is case sensitive, a method named getthing would not match.

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Rajkumar balakrishnan

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posted 16 years ago

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Now i change the username to UserName.. all works fine it executes and displays the login page but when i click the submit button it shows an error like this...

HTTP Status 500 -

org.apache.jasper.JasperException: An exception occurred processing JSP page /view.jsp at line 16

13: <td>
14: <input type="text"
15: name="username"
16: value="${modelBean.UserName}" />
17: </td>
18: </tr>
19: <tr>

But i have changed the username to UserName but still it troubles me... what should i do now?

Help me regards this...

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Bear Bibeault

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posted 16 years ago

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You are still not following the JavaBean rules that Ben outlined.

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Rajkumar balakrishnan

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posted 16 years ago

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Mr.Bear Bibeault could you please tell me whats wrong with my EL. Because i dont know much about EL. Even though i changed message to Message it doesnt seems to be work. Can you spot my mistake and give me the answer. Please help me as i am a beginner. Thanks in advance

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Ulf Dittmer

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posted 16 years ago

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It should be "userName", not "UserName". The Java class then needs to have methods called setUserName and getUserName.

I think it would be helpful for you to go through an introduction to JSP; you might start with this free book.

Rajkumar balakrishnan

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posted 16 years ago

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Thanks Mr.Ulf Dittmer
Now i got a clear idea on EL and modify the program again.. yes it's working. The online free ebook is very helpful to understand JSP and Servlet concept for a beginner like me.. Anyway thanks for everybody helps regrding this problem.

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