Hi all,
the github dependabot opened a PR to upgrade checkstyle, as it has a
vulnerability... don't think we'd
be much affected, but the bot is going to be persistent and open new PRs
for it in the future, so I've
tried to fix it.

There is however a catch... checkstyle changed enough that our current rule
set needed amending,
removing references to rules that have been deprecated and removed in the
meantime.
Checkstyle also became more strict, and it's now reporting dangling
undocumented parameters
(before it was reporting only dangling _documented_ parameters, ignoring
the undocumented ones).

Went down the rabbit hole, and found myself fixing tens of errors per
module... too many to handle
by hand on a 120+ modules project. Also, I was fixing one time removing the
param, another time fixing
its name... inconsistent.

Finding dangling params is hard, but finding undocumented ones is easy....
while I was at it I run
seds to remove all undocumented params, returns, and throws tags as they
really add nothing (once
upon a time they were used by completion engines, before bytecode libraries
became widespread).
Here is the cleanup action:

find . -name "*.java" -exec sed -E -i "/^.*@param\s\w+\s*$/d" {} \;
find . -name "*.java" -exec sed -E -i "/^.*@param\s*$/d" {} \;
find . -name "*.java" -exec sed -E -i "/^.*@return\s*$/d" {} \;
find . -name "*.java" -exec sed -E -i "/^.*@throws\s\w+\s*$/d" {} \;

I did find one case where the param was on a line, and the description on
the next... and could surely
use a second pair of eyes to spot the few other cases where this might also
happened (I stared
at the diff for half an hour without spotting others):
https://github.com/geotools/geotools/pull/2781

The ugly side... 1500+ files modified, there were a lot of undocumented
tags!

If there are no objections, I'll merge this one and backport the changes to
the stable and maintenance
branches, to avoid backport nightmares in the next few months

Cheers
Andrea

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