Java

Need help with Servlets

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Join Date: Feb 2008

Posts: 88

Reputation: knight fyre is an unknown quantity at this point

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knight fyre knight fyre is offline

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Need help with Servlets

Jul 1st, 2008

I'm trying to step-up a simple servlet that processes a get action from a form.

When I click on the submit button I get the message.

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HTTP Status 404 - /jhtp6/welcome1

type Status report

message /jhtp6/welcome1

description The requested resource (/jhtp6/welcome1) is not available.

Apache Tomcat/5.0.25

I also included an image of my file structure.

Here's the java code

 Help with Code Tags 
 java Syntax (Toggle Plain Text) 
import javax.servlet.ServletException;        
import javax.servlet.http.HttpServlet;        
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
 9
public class WelcomeServlet extends HttpServlet
{
   // process "get" requests from clients           
   protected void doGet( HttpServletRequest request,
      HttpServletResponse response )                
         throws ServletException, IOException       
   {
      response.setContentType( "text/html" );
      PrintWriter out = response.getWriter();
19
      // send XHTML page to client
21
      // start XHTML document                    
      out.println( "<?xml version = \"1.0\"?>" );
24
      out.printf( "%s%s%s" , "<!DOCTYPE html PUBLIC",
         " \"-//W3C//DTD XHTML 1.0 Strict//EN\"",
         " \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n" );
28
      out.println( "<html xmlns = \"http://www.w3.org/1999/xhtml\">" );
30
      // head section of document
      out.println( "<head>" );
      out.println( "<title>A Simple Servlet Example</title>" );
      out.println( "</head>" );
35
      // body section of document
      out.println( "<body>" );
      out.println( "<h1>Welcome to Servlets!</h1>" );
      out.println( "</body>" );
40
      // end XHTML document
      out.println( "</html>" );
      out.close();  // close stream to complete the page
   } // end method doGet
} // end class WelcomeServlet
import javax.servlet.ServletException;        
import javax.servlet.http.HttpServlet;        
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
 9
public class WelcomeServlet extends HttpServlet
{
   // process "get" requests from clients           
   protected void doGet( HttpServletRequest request,
      HttpServletResponse response )                
         throws ServletException, IOException       
   {
      response.setContentType( "text/html" );
      PrintWriter out = response.getWriter();
19
      // send XHTML page to client
21
      // start XHTML document                    
      out.println( "<?xml version = \"1.0\"?>" );
24
      out.printf( "%s%s%s" , "<!DOCTYPE html PUBLIC",
         " \"-//W3C//DTD XHTML 1.0 Strict//EN\"",
         " \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n" );
28
      out.println( "<html xmlns = \"http://www.w3.org/1999/xhtml\">" );
30
      // head section of document
      out.println( "<head>" );
      out.println( "<title>A Simple Servlet Example</title>" );
      out.println( "</head>" );
35
      // body section of document
      out.println( "<body>" );
      out.println( "<h1>Welcome to Servlets!</h1>" );
      out.println( "</body>" );
40
      // end XHTML document
      out.println( "</html>" );
      out.close();  // close stream to complete the page
   } // end method doGet
} // end class WelcomeServlet

Here's the xml Code

 Help with Code Tags 
 xml Syntax (Toggle Plain Text) 
   <web-app xmlns= "http://java.sun.com/xml/ns/j2ee"       
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee  
         http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"  
      version="2.4">                                       
 
      <!-- General description of your Web application -->
      <display-name>                                      
         Java How to Program JSP                          
        and Servlet Chapter Examples                     
     </display-name>                                     
 
     <description>                               
        This is the Web application in which we  
        demonstrate our JSP and Servlet examples.
     </description>                              
 
     <!-- Servlet definitions -->                            
     <servlet>                                               
        <servlet-name>welcome1</servlet-name>                
 
        <description>                                        
           A simple servlet that handles an HTTP get request.
        </description>                                       
 
        <servlet-class>                                      
           WelcomeServlet                                    
        </servlet-class>                                     
     </servlet>                                              
 
     <!-- Servlet mappings -->               
     <servlet-mapping>                       
        <servlet-name>welcome1</servlet-name>
        <url-pattern>/welcome1</url-pattern> 
     </servlet-mapping>                      
 
  </web-app>
   <web-app xmlns= "http://java.sun.com/xml/ns/j2ee"       
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee  
         http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"  
      version="2.4">                                       
 
      <!-- General description of your Web application -->
      <display-name>                                      
         Java How to Program JSP                          
        and Servlet Chapter Examples                     
     </display-name>                                     

     <description>                               
        This is the Web application in which we  
        demonstrate our JSP and Servlet examples.
     </description>                              

     <!-- Servlet definitions -->                            
     <servlet>                                               
        <servlet-name>welcome1</servlet-name>                
                                                             
        <description>                                        
           A simple servlet that handles an HTTP get request.
        </description>                                       
                                                             
        <servlet-class>                                      
           WelcomeServlet                                    
        </servlet-class>                                     
     </servlet>                                              

     <!-- Servlet mappings -->               
     <servlet-mapping>                       
        <servlet-name>welcome1</servlet-name>
        <url-pattern>/welcome1</url-pattern> 
     </servlet-mapping>                      

  </web-app>

and here's the html document code

 Help with Code Tags 
 html Syntax (Toggle Plain Text) 
   <?xml version = "1.0"?>
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 
   <!-- Fig. 26.7: WelcomeServlet.html -->
 
   <html xmlns = "http://www.w3.org/1999/xhtml">
   <head>
      <title>Handling an HTTP Get Request</title>
  </head>
 
  <body>
     <form action = "/jhtp6/welcome1" method = "get" >
        <p><label>Click the button to invoke the servlet
           <input type = "submit" value = "Get HTML Document" />
        </label></p>
     </form>
  </body>
  </html>
   <?xml version = "1.0"?>
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

   <!-- Fig. 26.7: WelcomeServlet.html -->
 
   <html xmlns = "http://www.w3.org/1999/xhtml">
   <head>
      <title>Handling an HTTP Get Request</title>
  </head>

  <body>
     <form action = "/jhtp6/welcome1" method = "get" >
        <p><label>Click the button to invoke the servlet
           <input type = "submit" value = "Get HTML Document" />
        </label></p>
     </form>
  </body>
  </html>

Why do I get this message instead of the servlet response and how do I fix it.

Attached Thumbnails

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Join Date: Jul 2007

Posts: 1,175

Reputation: stephen84s is a glorious beacon of light

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stephen84s stephen84s is offline

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Re: Need help with Servlets

Jul 1st, 2008

Your servlet's .class file should be in WEB-INF/classes/ is that the case ?

Also once you move your servlets .class file there, you will need to either restart tomcat entirely or you will need to reload you application, by accessing the tomcat manager at http://localhost:8080/manager/html, for the URL I am assuming your tomcat is running on the same machine as you are working on and is configured to listen on port 8080 for requests

Last edited by stephen84s; Jul 1st, 2008 at 4:06 am.

"Any fool can write code that a computer can understand. Good programmers write code that humans can understand."

"How to ask questions the smart way ?"

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Join Date: Jul 2008

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paramasivam.b paramasivam.b is offline

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Re: Need help with Servlets

Jul 1st, 2008

hi,
error no: File Not Found Error.

So, please check the file name and the class name are same, to check correct path to save the file.
save the correct location and try again.....

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Join Date: Jul 2008

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sanaulla123 sanaulla123 is offline

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Re: Need help with Servlets

Jul 3rd, 2008

 Help with Code Tags 
 html Syntax (Toggle Plain Text) 
   <?xml version = "1.0"?>
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 
   <!-- Fig. 26.7: WelcomeServlet.html -->
 
   <html xmlns = "http://www.w3.org/1999/xhtml">
   <head>
      <title>Handling an HTTP Get Request</title>
  </head>
 
  <body>
     <form action = "welcome1" method = "get" >
        <p><label>Click the button to invoke the servlet
           <input type = "submit" value = "Get HTML Document" />
        </label></p>
     </form>
  </body>
  </html>
   <?xml version = "1.0"?>
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

   <!-- Fig. 26.7: WelcomeServlet.html -->
 
   <html xmlns = "http://www.w3.org/1999/xhtml">
   <head>
      <title>Handling an HTTP Get Request</title>
  </head>

  <body>
     <form action = "welcome1" method = "get" >
        <p><label>Click the button to invoke the servlet
           <input type = "submit" value = "Get HTML Document" />
        </label></p>
     </form>
  </body>
  </html>

Change the html given by u and put the above. The <form action="/jhtp6/welcome1" method="get"> has been changed to <form action="welcome1" method="get">

Hope it works

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Join Date: Aug 2008

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Reputation: mariamAbed is an unknown quantity at this point

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mariamAbed mariamAbed is offline

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Re: Need help with Servlets

Aug 29th, 2008

Salamo Alaikum Knight

I had the same error as yours; mine was solved that way

instead of <form action = "/jhtp6/welcome1" method = "get" >
it has to be <form method = "get" action = welcome1 >

Hope it works
Please give me feed back

Last edited by mariamAbed; Aug 29th, 2008 at 1:31 pm.