problem running a servlet on tomcat.

i have followed the steps given here. on typing "http://localhost:8080" i do get the apache tomcat page. i suppose that should mean that my tomcat server is up and running. but whn i try to run my servlet that is placed in the directories as it has been mentioned here, the browser responds "HTTP Status 404 - /java_mail/hello" wht could be the problem?

please help me out of this...

View Answers

February 25, 2011 at 12:36 PM

Put servlet-api.jar inside the lib folder of apache tomcat.

1)create a servlet.

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

public class HelloWorld extends HttpServlet{ 
  public void doGet(HttpServletRequest request, HttpServletResponse response)
                                   throws ServletException,IOException{
    response.setContentType("text/html");
    PrintWriter pw = response.getWriter();
    pw.println("<html>");
    pw.println("<head><title>Hello World</title></title>");
    pw.println("<body>");
    pw.println("<h1>Hello World</h1>");
    pw.println("</body></html>");
  }
}

2)Go to the webapps folder of your apache tomcat and create a web application folder but it should having an appropriate name like examples.

3)Create web.xml and classes folder inside the WEB_INF folder of web application folder.

4)Copy the servlet to the classes folder.

5)Edit the web.xml to include servlet?s name and url pattern.

 <servlet>
  <servlet-name>HelloWorld</servlet-name>
  <servlet-class>HelloWorld</servlet-class>
 </servlet>
 <servlet-mapping>
 <servlet-name>HelloWorld</servlet-name>
 <url-pattern>/HelloWorld</url-pattern>
 </servlet-mapping>

6)Compile your servlet.

7)Run Tomcat server by clicking the startup.bat file. This is located inside the bin folder of apache tomcat.

8)Open the browser and type the following url:

http://localhost:8080/webapplicationfolder_name/HelloWorld

For more information, visit the following link:

Servlet Tutorials

February 26, 2011 at 10:20 PM

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class servlet1 extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
    response.setContentType("text/html;charset=UTF-8");

PrintWriter out = response.getWriter();

        out.println("&lt;html&gt;");
        out.println("&lt;head&gt;");
        out.println("&lt;title&gt;Servlet NewServlet&lt;/title&gt;");  
        out.println("&lt;/head&gt;");
        out.println("&lt;body&gt;");
        out.println("&lt;h1&gt;Servlet NewServlet at " + request.getContextPath () + "&lt;/h1&gt;");
        out.println("&lt;/body&gt;");
        out.println("&lt;/html&gt;");


} 
}

my maping is like:

&lt;servlet-mapping&gt;
    &lt;servlet-name&gt;S1&lt;/servlet-name&gt;
    &lt;servlet-url&gt;/hello&lt;/servlet-url&gt;
&lt;/servlet-mapping&gt;

The folder locations are as below:

webapps>jmail>WEB-INF(contains web.xml)>classes>(contains servlet1.java)

I have started the server using the startup.bat file. and have checked if the server is running by typing "localhost:8080" in my browser and it seems to be working fine. but when i type "localhost:8080/jmail/hello" It shows: Apache Tomcat/6.0.20

Apache Tomcat/6.0.20> HTTP Status 404 - /jmail/hello
 type Status report 
 message /jmail/hello
description The requested resource
  (/jmail/hello) is not available.
Apache Tomcat/6.0.20Apache Tomcat/6.0.20
Apache Tomcat/6.0.20

i cant understand whats wrong. is it the server that might be creating issues?