No Error Message But A Blank Page Is Displayed!!!

[JiaPei Jen]

I am experimenting a basic application - logon. I got the first two screens working without problem. However, the third screen displays a blank page (no error message). I am having a very difficult time to figure out the problem; henceforth, seeking help. Here is the history of my application:
1. http://localhost:8080/LogonPractice/index.jsp (no problem and I clicked on "Sign in")
2. http://localhost:8080/LogonPractice/Logon.do;jsessionid=170B50E4D8E07EE36290E98342E8BF9C (no problem and the screen asked for username and password. I filled out the information and clicked on "Submit")
3. http://localhost:8080/LogonPractice/LogonSubmit.do (displayed a blank page)
The Tomcat log file shows the following (no error message at all):

2003-09-29 23:29:26 action: Processing a GET for /Logon
2003-09-29 23:29:26 action: Looking for Action instance for class org.apache.struts.actions.ForwardAction
2003-09-29 23:29:26 action: Double checking for Action instance already there
2003-09-29 23:29:26 action: Creating new Action instance
2003-09-29 23:29:35 action: Processing a POST for /LogonSubmit
2003-09-29 23:29:35 action: Looking for ActionForm bean under attribute 'logonForm'
2003-09-29 23:29:35 action: Creating new ActionForm instance of class 'org.apache.artimus.logon.LogonForm'
2003-09-29 23:29:35 action: Storing instance under attribute 'logonForm' in scope 'request'
2003-09-29 23:29:35 action: Populating bean properties from this request
2003-09-29 23:29:35 action: Validating input form properties
2003-09-29 23:29:35 action: No errors detected, accepting input
2003-09-29 23:29:35 action: Looking for Action instance for class org.apache.artimus.logon.LogonAction
2003-09-29 23:29:35 action: Double checking for Action instance already there
2003-09-29 23:29:35 action: Creating new Action instance

in my struts-config.xml, I have:

        <action 
            path="/LogonSubmit"
            type="org.apache.artimus.logon.LogonAction"
            name="logonForm"    
            scope="request"
            validate="true"
            input="/signin/Logon.jsp">
            <forward
                name="valid"
                path="/signin/Welcome.jsp"/>
        </action>

and my LogonAction.java is:

package org.apache.artimus.logon;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionServlet;
import org.apache.artimus.lang.Constants;
public final class LogonAction extends Action {
    public boolean isUserLogon(String username,
        String password) throws UserDirectoryException {
        return (UserDirectory.getInstance().isValidPassword(username,password));
        // return true;
    }

    public ActionForward execute(ActionMapping mapping,
            ActionForm form,
            HttpServletRequest request,
            HttpServletResponse response)
        throws IOException, ServletException {
        // Obtain username and password from web tier
        String username = ((LogonForm) form).getUsername();
        String password = ((LogonForm) form).getPassword();
        // Validate credentials with business tier
        boolean validated = false;
        try {
            validated = isUserLogon(username,password);
        }
        catch (UserDirectoryException ude) {
            // couldn't connect to user directory
            ActionErrors errors = new ActionErrors();
            errors.add(ActionErrors.GLOBAL_ERROR,
            new ActionError("error.logon.connect"));
            saveErrors(request,errors);
            // return to input page
            return (new ActionForward(mapping.getInput()));
        }
        if (!validated) {
            // credentials don't match
            ActionErrors errors = new ActionErrors();
            errors.add(ActionErrors.GLOBAL_ERROR,
            new ActionError("error.logon.invalid"));
            saveErrors(request,errors);
            // return to input page
            return (new ActionForward(mapping.getInput()));
        }
        // Save our logged-in user in the session,
        // because we use it again later.
        HttpSession session = request.getSession();
        session.setAttribute(Constants.USER_KEY, form);
        // Log this event, if appropriate
        if (servlet.getDebug() >= Constants.DEBUG) {
            StringBuffer message =
                new StringBuffer("LogonAction: User '");
            message.append(username);
            message.append("' logged on in session ");
            message.append(session.getId());
            servlet.log(message.toString());
        }
        // Return success
        return (mapping.findForward(Constants.VALID));
    }
} // End LogonAction

The Constants.class is in the ApplicationRoot/WEB-INF/classes/org/apache/artimus/lang directory. And I have

public static final String VALID = "valid";

My Welcome.jsp in the ApplicationRoot/signin folder looks like:

<%@ taglib uri="/tags/struts-bean" prefix="bean" %>
<%@ taglib uri="/tags/struts-html" prefix="html" %>
<%@ taglib uri="/tags/struts-logic" prefix="logic" %>
<HTML>
<HEAD>
<TITLE>Welcome!</TITLE>
<html:base/>
</HEAD>
<BODY>
<logic:present name="user">
<H3>Welcome <bean:write name="user" property="username"/>!</H3>
</logic:present>
<logic:notPresent scope="session" name="user">
<H3>Welcome World!</H3>
</logic:notPresent>
<html:errors/>
<UL>
<LI><html:link forward="logon">Sign in</html:link></LI>
<logic:present name="user">
<LI><html:link forward="logoff">Sign out</html:link></LI>
</logic:present>
</UL>
<IMG src='struts-power.gif' alt='Powered by Struts'>
</BODY>
</HTML>

[ September 29, 2003: Message edited by: JiaPei Jen ]

[satish pune]

Have you specified ApplicationResources.properties file in web.xml ?
Is there an entry for : "error.logon.invalid" in this file ?
-satish

[JiaPei Jen]

Yes, I have the code shown below in my web.xml file:

    <init-param>
      <param-name>application</param-name>
      <param-value>resources.application</param-value>
    </init-param>

and the application.properties is in the resources folder. And I have

error.logon.invalid=<LI>Username and password provided not found in user directory. Password must match exactly, including any lower or upper case characters.</LI>

in the application.properties file.