problem in running a servlet

http://localhost:8080/servlet/HelloWorldExample

Please describe your question. What is problem, stack trace (if any).

while running a servlet im getting an error HTTP 404 resource not available

development directory

webapps
sample
hello.jsp
WEB-INF
web.xml
classes
HelloWorldExample.java

HelloWorldExample.java

<code>

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

public class HelloWorldExample extends HttpServlet {

public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException
{
ResourceBundle rb =
ResourceBundle.getBundle("LocalStrings",request.getLocale());
response.setContentType("text/html");
PrintWriter out = response.getWriter();

out.println("<html>");
out.println("<head>");

String title = rb.getString("helloworld.title");

out.println("<title>" + title + "</title>");
out.println("</head>");
out.println("<body bgcolor=\"white\">");
out.println("<a href=\"../helloworld.html\">");
out.println("<img src=\"../images/code.gif\" height=24 " +
"width=24 align=right border=0 alt=\"view code\"></a>");
out.println("<a href=\"../index.html\">");
out.println("<img src=\"../images/return.gif\" height=24 " +
"width=24 align=right border=0 alt=\"return\"></a>");
out.println("<h1>" + title + "</h1>");
out.println("</body>");
out.println("</html>");
}
}

</code>

web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>
<servlet>
<servlet-name>HelloWorldExample</servlet-name>
<servlet-class>HelloWorldExample</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloWorldExample</servlet-name>
<url-pattern>/servlet/HelloWorldExample</url-pattern>
</servlet-mapping>
</web-app>

my classpath is set CLASSPATH=,;C:/Program Files/Apache Software Foundation/Tomcat 5.5/common/lib'servlet-api.jar

From directory structure you given it is not clear where you have placed web.xml file and HelloWorldExample.class file.

Web application directory structure in server should be as follows:

Place web.xml file inside WEB-INF directory.
WEB-INF directory contains :

WEB-INF/web.xml deployment descriptor

WEB-INF/classes directory

WEB-INF/lib directory

For more information on structure of web applications follow link - http://www.jsptube.com/servlet-tutorials/web-application-directory-structure.html

To access the servlet use url as - sample/servlet/HelloWorldExample' target='_new' rel='nofollow'>http://localhost:8080/sample/servlet/HelloWorldExample
(you missed context root (sample) in URL)

seems that you are a beginner to J2EE .

The best thing is suggest you is that if you have Tomcat installed , under webapps take any directory , chnage that to your context name ,put ypur files and configure inside web.xml for servlets .

Thats it .

thank you sir..............we got it

we tried the same for our project online bookstore

development directory

->bookstore
|-home.jsp
|-login.jsp
|-cart.jsp
|-register.jsp
|-order.jsp
|-index.jsp
|-category.jsp
|-checkout.jsp

->WEB-INF
->classes
|-login.class
|-logout.class
|-book.class
|-bookdata.class
|-customer.class
|-category.class
|-checkout.class
|-register.class
|-order.class
|-database.class
-> lib
|-bookstore.jar
|- mysql-connector.jar

when we compiled the jsp files we got

exception

org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:370)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

java.lang.NullPointerException
org.apache.jsp.cart_jsp._jspService(org.apache.jsp.cart_jsp:162)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

Please mention on which activity you got an error (any URL) and paste exact stack trace from log file. This might help us to recognize the problem.

while compiling home.jsp ......getting an exception error

http://localhost:8080/bookstoreNew/home.jsp

Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:451)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

root cause

java.lang.NullPointerException
org.apache.jsp.home_jsp._jspService(home_jsp.java:138)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

Some code in "home.jsp" file is causing error. Please post contents of home.jsp file.

<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<%@ page import="bookstore.*" %>
<%@ page import="java.util.*" %>

<!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=iso-8859-1" />
<title>The Book Store</title>
<style type="text/css">

</style>
</head>

<body>
<table width="100%" border="0" cellspacing="0" cellpadding="0" height="550">
<tr>
<td height="50" colspan="3"><table width="100%" border="0" cellspacing="0" cellpadding="0" height="70">
<tr>
<td width="50%" > <span class="style6"> The Book Store </span></td>
<td width="50%" align="right" valign="bottom"><% if(session.getAttribute("customer") != null) {

Customer customer = (Customer) session.getAttribute("customer"); %>

<p>Hello <%= customer.getFirstName() %>, <a href="Signout">Sign Out</a> </p>
<p><a href="ManageCart?c=v">View Cart </a>, </p>

<% } else { %> <p>Hello Guest, <a href="login.jsp">Sign In</a> </p>
<p><a href="ManageCart?c=v">View Cart </a> </p> <% } %></td>
</tr>
</table></td>
</tr>
<tr>
<td height="5" colspan="3" valign="top" ><hr/></td>
</tr>

<tr>
<td width="17%" height="450" valign="top" class="style10">
<h3> categories</h3>

<table width="100%" border="0" cellpadding="0" cellspacing="0" >

<%
ArrayList categories = (ArrayList) session.getAttribute("categories");
for (Iterator iter = categories.iterator(); iter.hasNext();) {

Category category = (Category) iter.next();

%>
<tr>
<td class="style12"><a href="Category?c=<%=category.getCategoryId() %>"><%= category.getCategoryName() %></a> </td>
</tr>

<% } %>

</table></td>
<td width="3%" valign="top"></td>
<td width="80%" valign="top" class="style13">
<h3> New Releases</h3>

<%
ArrayList newBooks = (ArrayList) session.getAttribute("newBooks");
for (Iterator iter = newBooks.iterator(); iter.hasNext();) {

Book book = (Book) iter.next();

%>

<table width="100%" height="117" border="0" cellpadding="0" cellspacing="0" class="style15">
<tr>
<td width="19%" rowspan="2" valign="top"><div align="center"><a href="Detail?b=<%=book.getIsbn() %>"><img src="<%=book.getThumbnail() %>" width="85" height="98" border="0"/></a></div> </td>
<td width="81%" height="45"><p><span class="style14"><a href="Detail?b=<%=book.getIsbn() %>"><%= book.getTitle() %></a></span><br />
By <%= book.getAuthor() %><br/>
Price:<span class="style16">Rs.<%= book.getPrice() %>
</span></p></td>
</tr>
<tr>
<td height="52" valign="top"><%= book.getDescription() %>… <a href="Detail?b=<%=book.getIsbn() %>">Read more.</a></td>
</tr>
</table>

<% } %>

</td>
</tr>
<tr>
<td height="5" colspan="3" valign="top" ><hr/></td>
</tr>
<tr>
<td height="40" colspan="3" valign="top" ><div align="center">The Book Store </div></td>
</tr>
</table>
</body>
</html>

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<code>
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<%@ page import="bookstore.*" %>
<%@ page import="java.util.*" %>

<jsp:useBean id="signinForm" class="bookstore.SigninForm" scope="request">
<jsp:setProperty name="signinForm" property="*"/>
</jsp:useBean>

<!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=iso-8859-1" />
<title>The Book Store</title>
<style type="text/css">

</style>
</head>

<body>
<table width="100%" border="0" cellspacing="0" cellpadding="0" height="550">
<tr>
<td height="50" colspan="3"><table width="100%" border="0" cellspacing="0" cellpadding="0" height="70">
<tr>
<td width="50%" > <span class="style6"> The Book Store </span></td>
<td width="50%" align="right" valign="bottom">
<p><a href="ManageCart?c=v">View Cart </a> </p></td>
</tr>
</table></td>
</tr>
<tr>
<td height="5" colspan="3" valign="top" ><hr/></td>
</tr>

<tr>
<td width="17%" height="450" valign="top" class="style10">
<h3> categories</h3>

<table width="100%" border="0" cellpadding="0" cellspacing="0" >

<%
ArrayList categories = (ArrayList) session.getAttribute("categories");
for (Iterator iter = categories.iterator(); iter.hasNext();) {

Category category = (Category) iter.next();

%>

<tr>
<td class="style12"><a href="Category?c=<%=category.getCategoryId() %>"><%= category.getCategoryName() %></a> </td>
</tr>

<% } %>

</table></td>
<td width="3%" valign="top"></td>
<td width="80%" valign="top" class="style13">
<h3> Customer Login </h3><br />

<form action="Signin" method="post">
<table width="50%" border="0" cellspacing="0" cellpadding="0" align="center" class="style17">
<tr>
<td colspan="2" align="center" height="20"></td>
</tr>
<tr>
<td colspan="2" align="center"><font color=red><%=signinForm.getErrorMsg("error")%></font></td>
</tr>
<tr>
<td width="46%"><div align="right">Username</div></td>
<td width="54%"><input type="text" name="userName" value="<%=signinForm.getUserName() %>"/>
<br><font color=red><%=signinForm.getErrorMsg("userName")%></font></td>
</tr>
<tr>
<td><div align="right">Password</div></td>
<td><input type="password" name="password" value="<%=signinForm.getPassword()%>" />
<br><font color=red><%=signinForm.getErrorMsg("password")%></font></td>
</tr>

<tr>
<td></td>
<td>
<input type="submit" name="Submit" value="Login" style="width:60%" />
</td>
</tr>
<tr>
<td></td>
<td> New User? <a href="register.jsp">Register</a> </td>
</tr>
</table>

</form>

</td>
</tr>
<tr>
<td height="5" colspan="3" valign="top" ><hr/></td>
</tr>
<tr>
<td height="40" colspan="3" valign="top" ><div align="center">The Book Store </div></td>
</tr>
</table>
</body>
</html>

</code>