Have you tried to put in it the "ROOT"? I guess may be something work it that. 
Also I created a filter (MyFilter) to test it, the following got executed twice 
:
-------------
MyFilter.<init>() line: 30 
NativeConstructorAccessorImpl.newInstance0(Constructor, Object[]) line: not 
available [native method] 
NativeConstructorAccessorImpl.newInstance(Object[]) line: 39 
DelegatingConstructorAccessorImpl.newInstance(Object[]) line: 27 
Constructor<T>.newInstance(Object...) line: 513 
Class<T>.newInstance0() line: 355 
Class<T>.newInstance() line: 308 
ApplicationFilterConfig.getFilter() line: 255 
ApplicationFilterConfig.setFilterDef(FilterDef) line: 397 
ApplicationFilterConfig.<init>(Context, FilterDef) line: 108 
StandardContext.filterStart() line: 3709 
StandardContext.start() line: 4356 
StandardHost(ContainerBase).start() line: 1045 
StandardHost.start() line: 719 
StandardEngine(ContainerBase).start() line: 1045 
StandardEngine.start() line: 443 
StandardService.start() line: 516 
StandardServer.start() line: 710 
Catalina.start() line: 578 
NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available 
[native method] 
NativeMethodAccessorImpl.invoke(Object, Object[]) line: 39 
DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 25 
Method.invoke(Object, Object...) line: 597 
Bootstrap.start() line: 288 
Bootstrap.main(String[]) line: 413 
 
----------
> From: [EMAIL PROTECTED]> To: users@tomcat.apache.org> Subject: Re: Singleton 
> in Tomcat 6.0 not working> Date: Thu, 5 Jun 2008 17:19:57 +0200> > > ----- 
> Original Message ----- > From: "Mikolaj Rydzewski" <[EMAIL PROTECTED]>> To: 
> "Tomcat Users List" <users@tomcat.apache.org>> Sent: Thursday, June 05, 2008 
> 5:06 PM> Subject: Re: Singleton in Tomcat 6.0 not working> > > > ktou Ho 
> wrote:> >> The problem I am facing is the Singleton is not working at all in 
> the > >> servlet. I tried to synchnozed the constructor or make it static. I 
> > >> still get two instances of the objects. How can I solve the problem?> > 
> Is anyone able to reproduce this?> > No, for fun I gave it a spin... it 
> worked, one count> Think ktou is going to have to post his code> Like chuck 
> said, something fishy ;)> On NB its easy to mistakenly set up glassfish as 
> the server - ha ha> > > >> public class RemoteDBConnections> >> {> >> private 
> static RemoteDBConnections sInstance = new > >> RemoteDBConnections();> >> 
> private static int counter=0;> >> private RemoteDBConnections()> >> {> >> 
> System.out.println("counter =" + (counter++));> >>> > Add following line 
> (assuming you do not override default toString method):> >> > 
> System.out.println(this.toString());> >> > and compare results.> 
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