Finding the custom tag name from inside the tag handler

Hello,
I searched the forum, but couldnt find the answer (or in the API). In my custom tag handler, I want to know what the name of the custom tag was. Is this possible?
Thanks in advance.
Chris
ps. Without parsing the .tld file... :)

Hmm, that's unfortunate. Thanks a lot for your work. I had a feeling since it wasn't in the API that it wasn't possible. Here's why, and maybe they will add this feature later...
We are making our own tags for buttons on our app (the button will be an HTML table, with a clickable background, that looks like an image, but isnt).
The HTML designers want tags they can drag and drop to the screen in DreamWeaver, including visual feedback on what they dragged and dropped. So the tag <fast:blueButton>Continue</fast:blueButton> will show a blue button image in dreamWeaver with "Continue" as the text. There are a lot of parameters to set for each button, like height, width, border, etc. that will be configured in an XML config file for each button.
It would be nice if all the buttons we invent in the tld point to the same generic button class, and when the generic button class runs, sees which button called it, and gets its config from an XML file.
This way the designer could add more buttons with the tld and XML config, and no more java classes are needed. However, if a generic button is sent with a type param: <fast:button type="blue">Continue</fast:button> then there is no visual feedback in the tool (in the first case we could have set the fast:blueButton to be the image of a blue button) and it cant be picked from a list in the tool (the designer needs to remember which types exist). It seems not important to programmers, but for designers it is important.
Oh well, I will see if there is another way to NOT have tons of Java classes to support.
Thanks,
Chris

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I copied the same Administrator settings, code and folders
from the
working production server to my local machine and it just
doesn't seem
to work. (I couldn't find any differences to the working
application)
I tried to fix it by copying the custom tag folder (located
under allaire/spectra/customtags/) to C:\CFusion\CustomTags which
somehow cleared the previous error but gave me the following new
one:
"Error Occurred While Processing Request > Error
Diagnostic Information > This application can't be located by
name. Use ApplicationID instead"
Please, i appreciate any kind of comment on this post (i have
been trying to fix this for the past 3 days!)
Thanks,
bbinto

Spectra requires 4.5.1 or 5.
Run the Spectra install to set up all the correct mappings
and the webtop. Then copy over the custom application. It's been
awhile since I've dug into the folder structure of the webtop, so I
don't have a complete list of steps required for a Spectra app
deployment. So you still have some work ahead of you.
Just make sure you backup your database before the install,
mirror it, or use a new schema for the installation and then switch
over your datasources.
I would recommend an old Spectra book you can probably find
on eBay.
http://www.forta.com/books/0789723654/

Custom tag help

Hi there,
I was wondering if someone might help me construct a custom tag handler class that either allows or denies access to a given JSP page? I'll start by showing the code I want to replace in all my JSP pages:
<%
String companyID = (String)session.getAttribute("companyID");
String administratorID = (String)session.getAttribute("administratorID");
if(companyID == null || administratorID == null)
     out.println(ServletUtilities.headWithTitle("ACCESS DENIED") +
    <body><h1>ACCESS DENIED</h1><a href=\"/scholastic/Login.jsp\">Return to Login Page</a></body></html>");
     return;
else
%>What this code is doing is extracting from the session object the companyID and administratorID. Both of these were placed into the session object when the user logged into the system. As we know, when a session times out, these IDs no longer exist, thus I test for null. If either value is null, then I create HTML markup that instructs the user to login again.
So, what would be better is a custom tag that I can call just once, like so:
<%@ taglib uri="stlib-taglib.tld" prifix="stlib" %>
<stlib:allow_admin_access />
The behaviour I want is to prevent the rest of the JSP from loading if the custom tag is unable to obtain the companyID and administratorID from the session object.
I've not create custom tags before and would like some guidance on the tag handler class. Perhaps declare it:
public class AllowAdminAccess extends TagSupport
public int doStartTag(){...}
public int doEndTag(){...}
}Please advise,
Alan

Ok, I obtained a tutorial I found on the net and am trying to make it work on my application. So far, this is what I have:

<filter>
      <filter-name>AccessFilter</filter-name>
      <filter-class>mvcs.AccessFilter</filter-class>
      <description>This filter attempts of obtain a User object from the HttpSession. The User object would have been placed their identifying the user when he/she logged in. If it doesn't exist, the session has probably timed out, or this is an unauthorized user. If the User object is null the person is redirected to the Login.jsp page.</description>
      <init-param>
        <param-name>login_page</param-name>
        <param-value>/scholastic/Login.jsp</param-value>
      </init-param>
    </filter>
    <filter-mapping>
         <filter-name>AccessFilter</filter-name>
         <url-pattern>/*</url-pattern>
    </filter-mapping>

import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.*;
public class AccessFilter implements Filter {
protected FilterConfig filterConfig;
private final static String FILTER_APPLIED = "_filter_applied";
public void init(FilterConfig config) throws ServletException {
    this.filterConfig = config;
public void doFilter(ServletRequest request, ServletResponse response,
                   FilterChain chain) throws IOException, ServletException
    boolean authorized = false;
    // Ensure that filter is only applied once per request.
    if (request.getAttribute(FILTER_APPLIED) == null)
      request.setAttribute(FILTER_APPLIED, Boolean.TRUE);
      if(request instanceof HttpServletRequest)
        HttpSession session = ((HttpServletRequest)request).getSession(false);
        if(session != null)
          User user = (User)session.getAttribute("scholastic.tracks.user");
          if(user != null)
             authorized = true;
    if(authorized)
      chain.doFilter(request, response);
      return;
    else if(filterConfig != null)
      String login_page = filterConfig.getInitParameter("login_page");
      System.out.println("login_page: " + login_page);
      if(login_page != null && !login_page.equals(""))
        System.out.println("Step1");
        filterConfig.getServletContext().getRequestDispatcher(login_page).forward(request, response);
        System.out.println("Step2");
        return;
    throw new ServletException("Unauthorized access, unable to forward to login page");
public void destroy() { }
}The directory structure for my application goes like this:
webapps/scholastic/Login.jsp
webapps/scholastic/*.jsp
webapps/scholastic/admin/*.jsp
webapps/scholastic/WEB-INF/classes/servlets.class
Now, when I launch the browser and try to go to http://localhost:8080/scholastic/Login.jsp AccessFilter kicks in and since there is no User object in the session object yet, authorized will remain false. The logic continues to the line:
filterConfig.getServletContext().getRequestDispatcher(login_page).forward(request, response);
But in the end I wind up with a Page Not Found 404 error.
I tried changing the <param-value>/scholastic/Login.jsp</param-value> to just <param-value>/Login.jsp</param-value> but this resulted in an endless loop condition with the Tomcat container. "/scholastic/Login.jsp" is the correct relative URL. So I'm stuck at this point.
Please advise,
Alan

Evaluate customtag inside tag handler.

How to make a custom tag to be evaluated in another custom tag handler?
Sample Code:
public class MyTag extends ELTextTag {
public int doStartTag() throws JspException {
     StringBuffer js = new StringBuffer(800);
     // This is evaluated
     js.append(�<tr></td>this plain html is evaluated</td></tr>�);
     // This custom tag doest not evaluate, just prints as it is
     js.append(�<myTag:divTag class=\�tagClass\� />�);
TagUtils.getInstance().write(this.pageContext, js.toString());
How to force this custom tags to be evaluated ?
Rgds
Ramya

I guess you are referring to post #3 in the other thread where somebody had suggested that the way to do it would be to replicate the container implementation of the nested tag inside the main one.
I think that's exactly what the cold tags link that I posted does. Its a hack and if it works, then I dont see why you shouldnt use it.
However a word of caution. Tags, like servlets are container managed objects and every container does several optimizations on tag instances. For example some containers pool tag objects per page. By hijacking the lifecycle methods of the tag, you may be opening yourself to some potentially serious discrepancies when the tag is used by itself (ie the container invokes it) and you use it from within another tag.
If you arent impressed, think about this - is it proper to call a Servlet from another Servlet just by invoking the init(), service() and destroy() method of the second servlet from within the first? It would work, but God only knows what problems you would face in future to such hacks :)
Anyways all the best.
cheers,
ram :)

Finding the custom tag name from inside the tag handler

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