David ,
Echo is good...as it turned out this line was returning null,
String userName = ((LogonForm) form).getUsername();
I'm new to java and Tomcat/Struts so I'm strugglig with where to put the users info once they have successfully logged on.(Logon is just a query to a database to find unername and password) I guess the LogonForm object is inaccessable once the LogonAction finishes up.
I thought setting attributes was best, is that the case? Jim barrows on this list suggested I do this,
String x = request.getRemoteUser();
...but it also returns null from an ActionForward
-Jim
From: "David G. Friedman" <[EMAIL PROTECTED]> Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]> To: "Struts Users Mailing List" <[EMAIL PROTECTED]> Subject: RE: Mapping issue Date: Thu, 16 Dec 2004 19:59:33 -0500
Jim,
Since your JSP thinks something is null, have you tried putting something like the below code in your RetrieveFormAction.execute() method before you do your request.setAttribute(...) call?
if ( result == null ) { System.out.println("Result set is NULL!"); } else { System.out.println("Result has " + result.size() + " items."); }
OR, in your JSP, have you added similar code to the below?
<% ArrayList forms = (ArrayList)request.getAttribute("forms"); if ( forms == null ) { out.println("I am a null form, help!"); } else { out.println("Forms exists, let's see the data.<br />"); Iterator it = forms.iterator();
while(it.hasNext()) { out.print("<br>try " + it.next()); } } %>
I'm big on echo printing where debugging null pointers are concerned. :)
Regards, David
-----Original Message----- From: Jim Douglas [mailto:[EMAIL PROTECTED] Sent: Wednesday, December 15, 2004 11:26 PM To: [EMAIL PROTECTED] Subject: RE: Mapping issue
David,
Yes, struts-conf is in WEB-INF,
Here's the application error log, apparently it's finding the for.jsp before
crashing,
DEBUG - insert page='/portal/forms.jsp'. DEBUG - servletPath=/portal/forms.jsp, pathInfo=null, queryString=null, name=null DEBUG - Path Based Include INFO - default: DefaultServlet.serveResource: Serving resource '/images/id_nav_outside.gif' headers and data INFO - default: DefaultServlet.serveResource: Serving resource '/images/id_nav_bkgnd.gif' headers and data ERROR - Servlet.service() for servlet jsp threw exception java.lang.NullPointerException at org.apache.jsp.portal.forms_jsp._jspService(org.apache.jsp.portal.forms_jsp: 52) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:99) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:3 25)
This is forms.jsp,
<%@ page import="java.util.*" %>
<html> <body> <h1 align="center">Forms Listing</h1> <p>
<% ArrayList forms = (ArrayList)request.getAttribute("forms"); Iterator it = forms.iterator();
while(it.hasNext()) { out.print("<br>try " + it.next()); }
%> </body> </html>
...and this is the code that sets the "forms attribute,
public final class RetrieveFormAction extends Action {
private final static Logger log = Logger.getLogger(RetrieveFormAction.class); String sTemp ="";
public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) //throws IOException, ServletException { throws Exception { ArrayList forms = new ArrayList();
String userName = ((LogonForm) form).getUsername();
DataSource dataSource = getDataSource(request, "userDB"); Connection conn = dataSource.getConnection(); Statement stmt = conn.createStatement();
String query = "SELECT * FROM users";
log.info("query = " + query); ResultSet rs = stmt.executeQuery(query);
Boolean validate = false; while (rs.next()) { sTemp = rs.getString(1); forms.add(sTemp); } rs.close(); rs = null;
ArrayList result = forms; request.setAttribute("forms", result); return mapping.findForward("show_forms");
} }
Thanks, Jim
>From: "David G. Friedman" <[EMAIL PROTECTED]> >Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]> >To: "Struts Users Mailing List" <[EMAIL PROTECTED]> >Subject: RE: Mapping issue >Date: Wed, 15 Dec 2004 19:31:14 -0500 > >Have you checked your application server's log files to see if there were >any Struts startup errors? Where are you putting the "struts-conf" file? >Are you putting it in the file "/WEB-INF/struts-config.xml"? > >Regards, >David > >-----Original Message----- >From: Jim Douglas [mailto:[EMAIL PROTECTED] >Sent: Wednesday, December 15, 2004 7:17 PM >To: [EMAIL PROTECTED] >Subject: Mapping issue > > >To all, > >This is my error message in the browser, > >javax.servlet.ServletException: Cannot retrieve mapping for action >/SelectUser > >The class files are in the right place. This is struts-conf, > ><form-beans> > <form-bean name="ReturnStudentForms" > type="app.model.FormsSelect" /> > </form-beans> > ><action-mappings> > > <action-mappings> > <action path="/SelectUser" > type="app.web.RetrieveFormAction" > name="ReturnStudentForms" scope="request" > validate="true" input="/portal/user.jsp"> > <forward name="show_forms" > path="/portal/forms.jsp" /> > </action> > </action-mappings> > > >Thanks, >Jim > > > >--------------------------------------------------------------------- >To unsubscribe, e-mail: [EMAIL PROTECTED] >For additional commands, e-mail: [EMAIL PROTECTED] > > >--------------------------------------------------------------------- >To unsubscribe, e-mail: [EMAIL PROTECTED] >For additional commands, e-mail: [EMAIL PROTECTED] >
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