I'm not sure where in your scenario the error was supposed to occur.
I would suggest just right clicking on the blank page and see what the src
holds.
If you change the last line to:
ActionForward valForward = mapping.findForward(Constants.VALID);
servlet.log("Forwarding to: " + valForward );
return valForward;
That might help too.
-Tim
-----Original Message-----
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Tuesday, September 30, 2003 12:15 AM
To: [EMAIL PROTECTED]
Subject: No Error Message But A Blank Page Is Displayed.
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=170B50E4D8E07EE36290
E98342E8BF9C
(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>
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