comment on the original post.
I think such a tool is a good stop gap measure but in general I think our
perspective on this is all wrong. We have a great modular framework and
isolated classloading. Its a framework that can support applications
different lib versions on it. Why not leverage that more?
It's the changes to the server framework implementation that seems to
cause the most pain in moving an application from one server version to
AS7 is a case in point. Providing a new improved framework is a good thing
but why not provide an infra-structure (module) along with it to enable the
from the previous to the current seamless? Why make the customer do so
We've all seen the forum discussion where a user is attempting to migrate
AS 4 app lock stock and barrel to AS 7 and ask how to resolve related
I too have scratched my head and asked, "why would he ever want to do
Well, the user has put in a lot of man hours writing that app, fixing bugs,
making it stable. He does not want to take the risk of introducing any new
bugs with changes. He does want to write his new code to the current
and run it in the current environment and he wants a single server
to do it in.
I've always envisioned JEE implementations to be an environment much like
OS. When I update my OS I don't have to alter any of the apps I'm running.
I don't have to redeploy them or reconfigure them in any way. It just
I expect the same of my JEE implementations, and to date I've been
by all the vendors.
I think the framework provided in AS 7 and WildFly empowers us to provide
JEE environment that supports that AS 4 app running unaltered in WildFly. I
think there a number of functions that can and should be *retrofited* to
The Hibernate 3 module is an example of this. An AS4/AS5 server config
loader module is another. Support for the predecessors of HornetQ and
As we move forward with WildFly and future versions I would argue we need
design seamless support for prior versions of the components and provide
compatibility not just at the JEE api level but the server framework
level. (Treat it like an OS)