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Olaf,

On 5/9/18 8:39 PM, Olaf Kock wrote:
> 
> On 09.05.2018 17:09, James H. H. Lampert wrote:
>> Question:
>> 
>> Is there an easy way to bump a working Tomcat installation from
>> one release to another, without benefit of Linux "apt-get" or
>> "yum," or WinDoze "cab" (this is an OS/400 installation), without
>> having to rebuild the whole configuration (webapps, keystore,
>> server.xml, web.xml, &c.) from scratch?
>> 
> 
> Depending on the changes in your configuration and changes
> introduced between your "come from" version versus the "go to"
> version.
> 
> IMHO the easiest way to figure out is to download your source and
> target version of vanilla tomcat and compare them with a diff
> tool.

Also this tool, if you are upgrading within major releases:

https://tomcat.apache.org/migration-85.html#Tomcat_8.5.x_configuration_f
ile_differences

I never modify conf/web.xml or conf/context.xml. It makes things much
easier.

For major releases, I usually start with the stock conf/server.xml and
re-add all of the necessary configuration, using Olaf's "diff"
technique above. Sometimes, you have to add less than you had added
before. Sometimes, more. :)

- -chris
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