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Andres,

On 2/9/12 11:26 AM, Andres Aguado wrote:
> Hi, first, for me there is a powerfull reason for maintain 5.5 
> version. This is the initial version and application is working
> fine now, and I think that i'm not prepare to execute the upgrade,
> i don't know how and where to begin.

Upgrading from 5.5 to 7.0 should ideally be as painless as installing
Tomcat 7 and dropping your WAR into the webapps directory. The APIs
are all backward-compatible.

You may run into trouble in the following areas:
0. Don't have a META-INF/context.xml file?
   Make one. Don't use server.xml for webapp deployment anymore.

1. Non-spec-standard behavior
   Newer versions of Tomcat have become increasingly cranky about
   bad code, configurations, etc. You may have some warnings and/or
   errors that you will have to fix. You should fix those /anyway/,
   but now Tomcat complains about them.

2. Logging
   Logging has changed a lot over the years and so you'll have to read
   the documentation if things don't work for you.

3. Edge cases
   There are lots more settings in the later versions of Tomcat to
   get it to behave in ways that used to be the standard (or at least
   expected behavior). If you find that your webapp is acting strangely,
   check Tomcat's changelog to see what might have changed.

- -chris
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