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From "Ralph Einfeldt" <>
Subject AW: compatibility Tomact 3.3.1 and 4.x
Date Thu, 11 Apr 2002 09:49:10 GMT
Some differences are caused by the fact that tomcat 3.x and 4.x
implement different servlet and jsp specs. 2.2/1.1 -> 2.3/1.2

But tomcat should be backwards compatible with all spec related 

Some other effects are created by the fact that the classloader 
architecture is quite different.

Other effects have their cause in the different states for
certain libraries. (e.g. AFAIK mod_jk supports no loadbalancing
for tomcat 4 but for 3.2/3.3)

It's no problem to run several versions of tomcat on one machine.
You have only to make shure that you avoid port conflicts.


  Here we have the original distribution.

For all domains that use tomcat 4 we have following setup

    Here we have our edited config files for the site
    (We have one server per site)
    Here we have scripts that sets following env vars
    to start and stop tomcat:
      CATALINA_HOME points to the tomcat version
      we wan to use for a given site.
      CATALINA_BASE points to the base directory of 
      the site

As we didn't have a multisite environment for tomcat 3.*
I didn't look how to achive this setup with it.

> -----Urspr√ľngliche Nachricht-----
> Von: rainer j√ľnger []
> Gesendet: Donnerstag, 11. April 2002 10:58
> An: Tomcat Users List
> Betreff: compatibility Tomact 3.3.1 and 4.x
> Hi,
> We are running applications on Tomcat 3.3.1 but want to 
> update to 4.x to use new featrues for future projects.
> 1) What are the incompatibilities and how is your experiance 
> by doing this?
> 2) Can someone run 3.3.1 and 4.x on _ONE_ box parallel?
> thanks,
> rainer juenger

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