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Paul,

On 8/29/18 10:51, Lueders, Paul T CIV USARMY NGIC (US) wrote:
> I would like to migrate from tomcat 7.0.90 to the latest version
> of tomcat9.  Is there a document that lists the benefits of tomcat9
> and the differences between tomcat7 and tomcat9

http://tomcat.apache.org/whichversion.html

Shows what versions of various specifications are supported.

WebSocket support was added in 7.0.x so there isn't anything that you
are really *missing* by staying on 7.0.x.

However, there have been many changes to improve performance and
remove support for unused stuff (e.g. Java-BIO) that may improve
performance and scalability.

For my money, I'd plan on definitely moving to something other than
7.0.x soon, because (based upon your email address), I'm guessing it
takes a long time to get a big change like this made. Tomcat 7.0.x
isn't on the chopping-block, yet, but it *will* be the next one to be
left unsupported.

The major difference between 8.5.x and 9.0.x is that 9.0.x is even
stricter about a few things. I might try installing Tomcat 9.0.x into
a testing environment and start working-through the application to see
if there are any parts that stop working or start behaving less than
ideally. If you have any issues, post here and we can help. It may be
that 8.5.x is better for you in the short-term, but you should have
your sights set on 9.0.x for the future.

Hope that helps,
- -chris
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