error comes while running the struts application please see the source code for detail

[tamnna arzoo]

Iam making application in struts for Login iam using the logic if username and password both are equal then redirect to sucess.jsp otherwise redirect to failure.jsp

when i run my application on eclipse the error comes

HTTP Status 500 -

--------------------------------------------------------------------------------

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: An exception occurred processing JSP page /Login.jsp at line 18

15:     
16: </div> 
17:   
18: <html:form action="/Login" > 
19:         
20: User Name :<html:text name="LoginForm" property="userName" /> 
21:         


Stacktrace:
	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:515)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:426)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)


root cause 

java.lang.NullPointerException: Module 'null' not found.
	org.apache.struts.taglib.TagUtils.getModuleConfig(TagUtils.java:755)
	org.apache.struts.taglib.TagUtils.getModuleConfig(TagUtils.java:735)
	org.apache.struts.taglib.html.FormTag.lookup(FormTag.java:818)
	org.apache.struts.taglib.html.FormTag.doStartTag(FormTag.java:488)
	org.apache.jsp.Login_jsp._jspx_meth_html_005fform_005f0(Login_jsp.java:134)
	org.apache.jsp.Login_jsp._jspService(Login_jsp.java:88)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:384)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)


note The full stack trace of the root cause is available in the Apache Tomcat/6.0.10 logs.

Please me the solution of this error and please tell me the reason why this error comes


--------------------------------------------------------------------------------

Apache Tomcat/6.0.10


=======================
struts-config.xml 

<?xml version="1.0" encoding="UTF-8"?>
<struts-config> 
   
<form-beans> 
        
<form-bean name="LoginForm" type="com.vaannila.LoginForm"/> 
   
</form-beans> 

 
  
<action-mappings> 
       
<action input="/login.jsp" name="LoginForm" path="/Login" scope="session" type="com.vaannila.LoginAction"> 
           
<forward name="success" path="/success.jsp" /> 
           
<forward name="failure" path="/failure.jsp" /> 
      
</action>     
</action-mappings> 
</struts-config>


====================
web.xml
==================

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>LoginAction</display-name>
  <welcome-file-list>
    <welcome-file>Login.jsp</welcome-file>
  
  </welcome-file-list>
</web-app>
=================
LoginAction.java
==================
package com.vaannila;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionForm;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginAction extends Action 

{
	private final static String SUCCESS = "success"; 
   
	private final static String FAILURE = "failure"; 
   
	public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception 
	
	{ 
      
	LoginForm loginForm = (LoginForm) form; 
        
	if (loginForm.getUserName().equals(loginForm.getPassword())) 
	
	{ 
             
	return mapping.findForward(SUCCESS); 
        
	} 
	
	else 
	
	{ 
	             
	return mapping.findForward(FAILURE); 
       
	} 
    
	} 
	 }

=======================
LoginForm.java
===============

package com.vaannila;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.action.ActionErrors;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionMessage;

public class LoginForm extends ActionForm
{
	public static final long serialVersionUID=234242;
	
	
	String userName=null;
	String password=null;
	
	LoginForm()
	{
	}
	
	public void setUserName(String userName)
	{
	this.userName=userName;
	
	}
	
	public String getUserName()
	{
	return userName;
	}
	public void setPassword(String password)
	{
	this.password=password;
	}
	public String getPassword()
	{
	return password;
	}
	
	
	
	
	public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) 
	
	{ 
 

		
		
	    ActionErrors errors = new ActionErrors(); 
	    
		if (userName == null || userName.length() < 1)
		
		
		{ 
	        errors.add("userName", new ActionMessage("error.userName.required")); 
	    } 
	   
		if (password == null || password.length() < 1) 
		
		{ 
	        
		errors.add("password", new ActionMessage("error.password.required")); 
	    
		} 
	   
		return errors; 
		
	
	
	}


}

=======
Login.jap
==============

<%@taglib uri="/WEB-INF/struts-html.tld" prefix="html" %> 
03.<html> 
04.<head> 
05.<title>Login Page</title> 
06.</head> 
07.<body> 
08.    
<div style="color:red"> 
09.        
<html:errors /> 
10.    
</div> 
11.    
<html:form action="/Login" > 
12.        
User Name :<html:text name="LoginForm" property="userName" /> 
13.        
Password  :<html:password name="LoginForm" property="password" /> 
14.        
<html:submit value="Login" /> 
15.    
</html:form> 
16.</body> 
17.</html>

 =========

 

[Ankit Garg]

tamnna please Use Code Tags when you post a source code. That way your code looks formatted. Unformatted code is hard to read. You can add code tags by wrapping your code in [code] [/code] tags. You can edit your message using button and then add code tags to it...

[Shailesh Narkhede]

Declare ActionServlet in your web.xml

for more details just google for struts helloworld Application, you will get lots of stuff.

HTH

[David Newton]

In addition to actually telling Struts to process your requests, you also cannot access a JSP with Struts form tags in it directly--the request must go through an action.

Is there any reason you're starting Struts with such an old version?

[christopher Daniel]

check web .xml with this tag Thats its giving you the error.

<?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">
 <servlet>
  <servlet-name>action</servlet-name>
        <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
        <init-param>
            <param-name>config</param-name>
            <param-value>/WEB-INF/struts-config.xml</param-value>
        </init-param>
        <init-param>
            <param-name>debug</param-name>
            <param-value>2</param-value>
        </init-param>
        <init-param>
            <param-name>detail</param-name>
            <param-value>2</param-value>
        </init-param>
        <load-on-startup>2</load-on-startup>
        </servlet>
    <servlet-mapping>
        <servlet-name>action</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>login.jsp</welcome-file>
        </welcome-file-list>
    <jsp-config>
        <taglib>
            <taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>
            <taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
        </taglib>
        <taglib>
            <taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>
            <taglib-location>/WEB-INF/struts-html.tld</taglib-location>
        </taglib>
        <taglib>
            <taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>
            <taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
        </taglib>
        <taglib>
            <taglib-uri>/WEB-INF/struts-nested.tld</taglib-uri>
            <taglib-location>/WEB-INF/struts-nested.tld</taglib-location>
        </taglib>
        <taglib>
            <taglib-uri>/WEB-INF/struts-tiles.tld</taglib-uri>
            <taglib-location>/WEB-INF/struts-tiles.tld</taglib-location>
        </taglib>
        </jsp-config>
    </web-app>