Error creating form bean in a simple struts application

[shanky raja]

Hi All,

I have been trying to resolve this issue for last 2 days but of no help. Please check why am i getting this error.

This is the exception i am getting on my browser

org.apache.jasper.JasperException: An exception occurred processing JSP page /login.jsp at line 12

9: <h1>Java Learning centre</h1>
10: <h2> User Login </h2>
11: <font color=red size=5>${EMSG}</font>
12: <html:form action="/LoginSubmit">
13: <table>
14: <tr>
15: <td>username:</td>


Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:505)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:398)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)


root cause

javax.servlet.ServletException: javax.servlet.jsp.JspException: Exception creating bean of class com.jlcindia.Struts1.LoginForm under form name LoginForm
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:862)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:791)
org.apache.jsp.login_jsp._jspService(login_jsp.java:83)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)


root cause

javax.servlet.jsp.JspException: Exception creating bean of class com.jlcindia.Struts1.LoginForm under form name LoginForm
org.apache.struts.taglib.html.FormTag.initFormBean(FormTag.java:536)
org.apache.struts.taglib.html.FormTag.doStartTag(FormTag.java:503)
org.apache.jsp.login_jsp._jspx_meth_html_005fform_005f0(login_jsp.java:138)
org.apache.jsp.login_jsp._jspx_meth_html_005fhtml_005f0(login_jsp.java:110)
org.apache.jsp.login_jsp._jspService(login_jsp.java:76)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)


This is what i am getting in my console window:

SEVERE: Error creating form bean of class com.jlcindia.Struts1.LoginForm
java.lang.NullPointerException
at org.apache.struts.config.FormBeanConfig.createActionForm(FormBeanConfig.java:289)
at org.apache.struts.util.RequestUtils.createActionForm(RequestUtils.java:259)
at org.apache.struts.util.RequestUtils.createActionForm(RequestUtils.java:213)
at org.apache.struts.taglib.html.FormTag.initFormBean(FormTag.java:526)
at org.apache.struts.taglib.html.FormTag.doStartTag(FormTag.java:503)
at org.apache.jsp.login_jsp._jspx_meth_html_005fform_005f0(login_jsp.java:132)
at org.apache.jsp.login_jsp._jspx_meth_html_005fhtml_005f0(login_jsp.java:104)
at org.apache.jsp.login_jsp._jspService(login_jsp.java:70)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Unknown Source)
11 Dec, 2012 1:50:10 AM org.apache.struts.util.PropertyMessageResources loadLocale
WARNING: Resource org/apache/struts/taglib/html/LocalStrings_en_IN.properties Not Found.
11 Dec, 2012 1:50:10 AM org.apache.struts.util.PropertyMessageResources loadLocale
WARNING: Resource org/apache/struts/taglib/html/LocalStrings_en.properties Not Found.
11 Dec, 2012 1:50:10 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet jsp threw exception
javax.servlet.jsp.JspException: Exception creating bean of class com.jlcindia.Struts1.LoginForm under form name LoginForm
at org.apache.struts.taglib.html.FormTag.initFormBean(FormTag.java:536)
at org.apache.struts.taglib.html.FormTag.doStartTag(FormTag.java:503)
at org.apache.jsp.login_jsp._jspx_meth_html_005fform_005f0(login_jsp.java:132)
at org.apache.jsp.login_jsp._jspx_meth_html_005fhtml_005f0(login_jsp.java:104)
at org.apache.jsp.login_jsp._jspService(login_jsp.java:70)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Unknown Source)



Below are the files used:-

login.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib uri="http://struts.apache.org/tags-html" prefix="html"%>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<html:html>
<body>
	<center> 
		<h1>Java Learning centre</h1>
		<h2> User Login </h2>
		<font color=red size=5>${EMSG}</font>
		<html:form action="/LoginSubmit">  
			<table>
				<tr>
					<td>username:</td>
					<td><html:text property="username"/></td>
					<td>Password:</td>
					<td><html:password property="password"/></td>
					<td><html:errors property="password"/></td>
				</tr>
				<tr>
					<td align="center" colspan="2">
					<html:submit value="Login Now"/></td>
				</tr>
			</table>
		</html:form>  
	</center>
</body>
</html:html>

home.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<center>
<h1>Java Learning Centre</h1>
<h2>Hello ${UN}, welcome</h2>
<h2>This is the home page</h2>
</center>
</body>
</html>

LoginForm.java

package com.jlcindia.struts1;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.*;

public class LoginForm extends ActionForm{
	
	private String username;
	private String password;
	
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
	public ActionErrors validate(ActionMapping am, HttpServletRequest req)
	{
		ActionErrors errors=new ActionErrors();
		if(username==null || username.length()==0)
		{
			ActionMessage error=new ActionMessage("username.required");
			errors.add("username",error);
		}
		if(password==null || password.length()==0)
		{
			ActionMessage error=new ActionMessage("password.required");
			errors.add("password",error);
		}
		return errors;
		
	}

}

LoginAction.java

package com.jlcindia.struts1;

import javax.servlet.http.*;
import org.apache.struts.action.*;

public class LoginAction extends Action{
	public ActionForward execute(ActionMapping am,ActionForm af,
                                     HttpServletRequest req,HttpServletResponse res) throws Exception
	{	
		String result;
		LoginForm lf=(LoginForm)af;
		String un=lf.getUsername();
		String pw=lf.getPassword();
		if(un.equals(pw))
		{
			result="success";
			req.setAttribute("un",un);
			
		}
		else
		{
			result="failed";
			req.setAttribute("EMSG","invalid uname or passwd");
		}
		return am.findForward(result);
		
	}

}

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>StrutsLab1</display-name>
  <welcome-file-list>
    <welcome-file>login.jsp</welcome-file>
  </welcome-file-list>
  <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/jlcindia-config.xml</param-value>
  	</init-param>
  	<load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
  	<servlet-name>action</servlet-name>
  	<url-pattern>*.do</url-pattern>
  </servlet-mapping>
</web-app>

jlcindia-config.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>StrutsLab1</display-name>
  <welcome-file-list>
    <welcome-file>login.jsp</welcome-file>
  </welcome-file-list>
  <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/jlcindia-config.xml</param-value>
  	</init-param>
  	<load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
  	<servlet-name>action</servlet-name>
  	<url-pattern>*.do</url-pattern>
  </servlet-mapping>
</web-app>

messages.properties

username.required=<font color=red size=5>username is reqd</font>
password.required=<font color=red size=5>password is reqd</font>

[Muhammad Saifuddin]

Have a look this FAQs entry regarding CannotCreateBean.

[shanky raja]

Hi Saifuddin,

Thanks for the quick response, but still i could not find any errors when checked with the FAQs entry.

[shanky raja]

Hi Bear,

I am sorry for the inconvenience caused. Will not repeat the same mistake next time onwards.