I guess the thought the process was to upgrade to 6, then 7, 8


On Sat, Jul 14, 2018 at 3:38 PM -0400, "Caldarale, Charles R" 
<<>> wrote:

> From: David Babooram []
> Subject: Re: Re: Tomcat 5.5.17 migration to 6

> But by decision was based on what was presented in the Apache site. In
that, upgrade from
> 5.5 was known to only go to 6.

Seriously, don't even think about "upgrading" to another very dead level.
There haven't been updates to Tomcat 6 for over a year; subsequent fixes for
known security holes and other issues have been applied to current levels,
but none of those will ever be retrofitted to Tomcat 6 (and 7, in the not
too distant future).  8.5 or 9.0 are the only sensible choices.

> Nevertheless.. is there some official documents on migrating to 8.5?

Due to the age of where you're starting from (over 12 years old), you're not
going to find anything specific for that level to a current one.  What you
can do is read all of the Migration Guides linked from here:
and get a sense of the changes needed for your webapp configurations.

You may well need to update JVM versions as well; if the one you're using is
also 12 years old, it's scary dangerous.

  - Chuck

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