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Error In JSP Page

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posted 15 years ago

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Hi Everyone,

I have am facing an error in a JSP page. Could you please let me know what the problem is because it seems quite all right to me!

I get this when i another jsp page on the server and from that JSP page the request comes to a servlet from which the request is forwarded to this JSP page!

Smitha H Rao

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posted 15 years ago

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I think the line 17 should be like below if you want to print cpDetails.get("CP_NAME") 's value.

<td ><%= cpDetails.get("CP_NAME") %></td>

Also make sure your JSP page know what cpDetails object is.

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Somnath Mallick

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posted 15 years ago

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That didn't work! Providing the whole JSP for a better view of the error!

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1" import="java.util.*"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
			<title>Environment Display Details</title>
	</head>
	<body style="BACKGROUND-COLOR: #c0c0c0; height : 359px;">
		<h1 style="FONT-FAMILY: 'Raavi';"><i><B FONT-FAMILY: 'Lucida Calligraphy'>Communications Provider Details:</B></i></h1>
		<br>
		<br>
		<br>
		<% HashMap cpDetails = (HashMap)request.getAttribute("cpDetails"); %>
		<table    border="1" >
 			<tr>
 				<td  >CP Name: </td>
 				<td  ><%= cpDetails.get("CP_NAME") %></td>
 			</tr>
 			<tr>
 				<td  >URL: </td>
 				<td  ><%= cpDetails.get("URL") %></td>
 			</tr>
 			<tr>
 				<td  >Duns ID: </td>
 				<td  ><%= cpDetails.get("ADDRESS") %></td>
 			</tr>
 			<tr>
 				<td  >XML Path: </td>
 				<td  ><%= cpDetails.get("PHONE_NO") %></td>
 			</tr>
 			<tr>
 				<td  >MMD Path: </td>
 				<td  ><%= cpDetails.get("ID_NO") %></td>
 			</tr>
 			<tr>
 				<td  >CPA ID: </td>
 				<td  ><%= cpDetails.get("CPA_ID") %></td>
 			</tr>
 		</table>
	</body>
</html>

Smitha H Rao

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posted 15 years ago

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You might get exception if your cpDetails is null.

Try something like this.
<%= (cpDetails!=null?cpDetails.get("CP_NAME"):"null") %>

Thanks
Smitha

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Somnath Mallick

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posted 15 years ago

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Thanks a lot Smitha! It worked!

Somnath Mallick

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I have another small Query! Please help me in on this one! I would like you to see my web.xml file. I want a JSP page to forward the request to a servlet but I always get the error

web.xml:

My form tag consists of:

The problem is the request is not forwarded to the servlet from the JSP. Could you please let me know what to put in the "action" attribute of the form tag?

mark benz

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posted 15 years ago

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Form action has to be relative, Not absolute.

because in <url-pattern> you said:

Ankit Garg

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Your form action doesn't need to have the full path of the requested servlet starting from the protocol. You can write /EnvironmentDetails/EnvDetailsServlet only. And as far as the error goes, did you override the doPost method in your servlet. It would be helpful if you showed us the the servlet code...

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Somnath Mallick

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posted 15 years ago

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My code is:

package com.internal.displayDetails;

import java.io.IOException;
import java.util.HashMap;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.environmentDetails.EnvironmentDetails;

/**
 * Servlet implementation class EnvDetailsServlet
 */
public class EnvDetailsServlet extends HttpServlet 
{
	private static final long serialVersionUID = 1L;
       
	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
	{
			
	}
	
	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
	{
		String environmentName = request.getParameter("environment");
		environmentName = environmentName.toUpperCase();
		String cpName = request.getParameter("cpName");
		
		HashMap cpDetails = EnvironmentDetails.readEnvDetails(cpName, environmentName);
		request.setAttribute("cpDetails", cpDetails);
		RequestDispatcher requestDispatcher = this.getServletContext().getRequestDispatcher("DisplayEnvironmentDetails.jsp");
		requestDispatcher.forward(request, response);
		
	}

}

Smitha H Rao

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posted 15 years ago

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There is nothing wrong with the web.xml entry

in form <form action="<%=request.getContextPath()%>/EnvDetailsServlet" method="post">

This will solve the problem.

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Max Rahder

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posted 15 years ago

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Smitha H Rao wrote:You might get exception if your cpDetails is null.
Try something like this.
<%= (cpDetails!=null?cpDetails.get("CP_NAME"):"null") %>

I would change your controller so cpDetails is guaranteed to be non-null. I.e., it should always reference a Map, although the Map could be empty.

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