Great, I'm sold! OK, so what are the biggest problems there have been in upgrading?
What do you mean an app running on 4.x may not work on 5.0.x? Is this only because of changes in the JSP spec, and older 1.2 is not compatible with the 2.0 spec?
Problems tend to be application related. The primary issue keeping me from trying 5.0 in production is this one as it changes the behavior of the manager webapp:
http://nagoya.apache.org/bugzilla/show_bug.cgi?id=25596
Unfortunately, that issue isn't easily fixed in TC 5 but is something to keep in mind if you are used to being able to reload a webapp without an interruption in service.
Aside from that, all of the applications I've tested basically dropped into TC 5 from TC 4. The only issue I ran across was that the jars in common/lib are different in TC 5 than TC 4 (most notably TC 5 no longer distributes javamail or the java activation framework.
-Dave
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