Thanks, that partially answers the question. 

But, why are we maintaining different versions of Servlet API's? A couple of
years ago I went to some trouble converting from 9.x to 10.x because I thought I
was "upgrading". 

Could I have just stuck with 9.x?

Is 10.x -> 11.x something I should do (upgrade) or just stick with 10.x?

THX --Mark

On Tue, 12 May 2026 21:28:33 +0900 David Wall <[email protected]> wrote:

> Different versions of Java and Servlet APIs and Java EE architectures.
>
> On 5/12/26 9:08 PM, Mark Foley wrote:
> > Recently I've received emails from this list with the following subjects:
> >
> > Apache Tomcat 9.0.117 available
> >
> > Apache Tomcat 10.1.54 Available
> >
> > Apache Tomcat 11.0.21 Available
> >
> > I'm mildly confused. Most packages I use have a current, maintained 
> > release, period. Is Apache Tomcat running 3 parallel releases? It seems 9, 
> > 10 and 11 are all getting periodic updates.
> >
> > If Apache Tomcat is maintaining 3 parallel releases, why?
> >
> > THX --Mark
> >
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