Re: How to use servlet filters without modifying webapp

[Robert r. Sanders]

Try the following:
   - Put you filter into a package, I've seen some versions of the JVM 
that really don't like non-package classes.
   - Make sure you are using settings compatible with the JVM that 
Tomcat is running under when compiling the class.

joelsherriff wrote:
I've done that, thanks.  Here's what I added for the filter:
   <filter>
       <filter-name>timerFilter</filter-name>
       <filter-class>TimerFilter</filter-class>
   </filter>
   <filter-mapping>
       <filter-name>timerFilter</filter-name>
       <url-pattern>/*</url-pattern>
   </filter-mapping>
to my web.xml.  It appears to be finding it properly.  If I change the
filter name to a non-existent filter, I
properly get a ClassNotFoundException.  So it's something IN the filter, or
so it would seem.  All I've
done is copy an example filter from the web - it looks like:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class TimerFilter implements Filter {
 private FilterConfig config = null;
 public void init(FilterConfig config) throws ServletException {
   this.config = config;
 }
 public void destroy() {
   this.config = null;
 }
 public void doFilter(ServletRequest request, ServletResponse response,
                    FilterChain chain) throws IOException, ServletException
{
   long before = System.currentTimeMillis();
   chain.doFilter(request, response);
   long after = System.currentTimeMillis();
   String name = "";
   if (request instanceof HttpServletRequest) {
     name = ((HttpServletRequest)request).getRequestURI();
   }
   config.getServletContext().log(name + ": " + (after - before) + "ms");
 }
}

----- Original Message ----- 
From: "Anhony" <[EMAIL PROTECTED]>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>
Sent: Thursday, April 28, 2005 9:48 AM
Subject: Re: How to use servlet filters without modifying webapp

 

Greetings,
Try adding a <filter> block to your web.xml. Your JSP container locates
   

your
 

filters thru these sections in the web.xml. I included a small sample
<filter> block below.
<filter>
    <filter-name>processingFilter</filter-name>
    <filter-class>servletFilters.ProcessingFilter</filter-class>
</filter>
I hope this helps.
Anthony-

----- Original Message ----- 
From: "joelsherriff" <[EMAIL PROTECTED]>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>
Sent: Thursday, April 28, 2005 9:36 AM
Subject: How to use servlet filters without modifying webapp

Hello,
   I'm experimenting with applying a servlet filter to an existing webapp
and I'm getting a ClassCastException upon startup.
Can I do this without modifying the webapp source and adding my filter in
there?  If so, what else could be causing this?
I'm not sure where it looks for the filter .class file but I put it in the
webapp's WEB-INF/classes directory - I guess it finds it
since I'm getting this error.  The filter really does nothing, I'm just
trying to get A filter in place before making it more complicated.

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--
   Robert r. Sanders
   Chief Technologist
   iPOV
   (334) 821-5412
   www.ipov.net
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