CODEWITHSUNDEEP
tomcatservlets
Denys
Denys

Reputation: 4557

Running servlet on a TomCat

I need to run my servlet on a server with a running tomcat.

I create my HelloWorld servlet from the java file(HelloWorld.java).

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 out = response.getWriter();
    out.println("<html>");
    out.println("<head><title>Hello World</title></head>");
    out.println("<body><h1>HELLO WORLD</h1></body>");
    out.println("</html>");
    out.close();
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
{
doGet( request, response );
}

}

Than I upload it on a server and run

javac HelloWorld.java

This command creates HelloWorld.class file which i put into WEB-INF/classes folder

Than I add some code to the web.xml file in the WEB-INF directory, so it looks like this

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
        <display-name>My first Servlet</display-name> 
    <servlet> 
        <servlet-name>HelloWorldServlet</servlet-name> 
        <servlet-class>HelloWorld</servlet-class> 
    </servlet> 
    <servlet-mapping> 
        <servlet-name>HelloWorldServlet</servlet-name> 
            <url-pattern>/HW</url-pattern> 
    </servlet-mapping> 
</web-app>

Than i run a command 

touch ~WEB-INF/web.xml

Now i try to access my HelloWorld servlet by entering URL like ~\HW.

But i get an error:

type Status report

message /group05/HW

description The requested resource (/group05/HW) is not available.

What would you recommend to do to fix it?

Thanks for considering my question.

Upvotes: 0

Views: 338

Answers (1)

BalusC
BalusC

Reputation: 1108537

There are in this particular case 2 potential causes:

  1. Tomcat isn't configured to hotdeploy after a web.xml edit. You need to restart Tomcat manually.

  2. The particular Tomcat setup doesn't support servlet classes in the default package. You should always put the class in a package if the class is intented to be used by another classes which are by itself inside a package (such as Tomcat internal classes).

See also:

Unrelated to the concrete problem, I understand that you're just getting started with servlets, I will however point out that this isn't the "best practice" to use servlets. I suggest to take a look in our servlets wiki page to get some concrete examples, learn about the canonical approaches and find links to proper tutorials.

Upvotes: 1

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