Re: Registering Servlets and Filters

[Andreas Kollegger]

Thanks to both Felix and Bertrand, servlets and filters are both now  
working.

Now, I'm moving on to deploying sitemesh as a filter. An initial  
challenge is that SiteMesh attempts to load configuration files using  
the ServletContext, which doesn't seem to search the bundle that  
loaded the filter. Is there a way to register search paths for the  
shared ServletContext? Otherwise I'll look into hacking SiteMesh to  
use alternative configuration methods.

Thanks,
Andreas


On May 7, 2009, at 3:02 AM, Felix Meschberger wrote:

Hi,

Andreas Kollegger schrieb:
With the current "Servlet Resolution" wiki page out-of-sync, does  
anyone
have a bare-bones example of registering a servlet and/or filter with
the Sling framework? It looks like a bundle just has to register a
javax.servlet.Servlet service with the proper sling properties for  
it to
get picked up. I've tried a simple OSGi Activator, but can't seem  
to get
it to work.

Example BundleActivator.start...

   public void start( BundleContext bc )
       throws Exception
   {
       Dictionary props = new Properties();
   props.put("sling.servlet.paths", "/myservlet/html, /myservlet/ 
txt");
       bc.registerService( javax.servlet.Servlet.class.getName(), new
MyServlet(), props );
  }

This is almost correct. The property value is either a single string  
or
an array of strings. So your example should really be:

   props.put("sling.servlet.paths",
          new String[]{ "/myservlet/html", "/myservlet/txt" });

But since you registered with absolute paths, the resource types must
also be absolute. Thus your example (with the fix for the property
value) should work for .html and .txt requests to resources whose
resource type "/myservlet".

If your resource types are relative -- e.g. "myservlet" -- you should
register with relative paths as in :

   props.put("sling.servlet.paths",
          new String[]{ "myservlet/html", "myservlet/txt" });

or better yet to register with two properties, one for the resource  
type
and for the extensions supported:

   props.put("sling.servlet.resourceTypes", "myservlet");
   props.put("sling.servlet.extensions", new String[]{"html","txt"});


HTH

Regards
Felix


Thanks for any guidance,
Andreas