Re: [Juglist] compare Apache Avalon with EJB containers

[Andrew C. Oliver]

Avalon centers around the Avalon Framework and has had many containers.  
Originally the framework was centered around Component Oriented 
Programming but has been lightly glossed into Service Oriented 
Programming.  The two guiding design goals are Seperation of Concerns 
and Inversion of Control.  The first is basically the dictate that two 
seperate asepects of functionality should be kept cleanly encapsulated 
away from each other.  The latter dictates a containment model of 
sorts.  The most famous implication of sorts (which was then rethought 
and both models were provided) was that all components which wished to 
log had to expose the Loggable interface and be configured with a logger 
by that which contained them. 

While I like many of the ideas 
(http://www.freeroller.net/page/acoliver/20021202#interfaces_services_and_anonymous_classes) 
in the Avalon framework, I'm underwhelmed by the community surrounding 
it (which is on one long continuous feud caused by an overly theoretical 
project) and more so by the actual implementations. 

If you need a high performance and stable container you'd be best 
advised towards JBoss rather than Avalon Phoenix or one of their OTHER 
containers.  If you need persistance, etc...  JBoss.  The downside being 
of course that you'll have to deal with the disgusting interfaces and 
antipaterns of EJBs.  However, my advice would be to learn from Avalon 
while using something else.  (The next version of JBoss will allow you 
to use Plain Old Java Objects but thats too far away).

If you have any specific questions about either I'll do my best to 
answer them or forward them to someone who can.  Perhaps Nicola will 
give an opposing viewpoint.  (though perhaps not)

-Andy

Richard O. Hammer wrote:

I am starting to work with Apache Avalon <http://avalon.apache.org/>. 
 This provides a container for components, for services.  I am curious 
about how this container compares to the EJB containers (such as 
JBoss, BEA, Websphere Application Server) about which I've heard so 
much, but which I've never used.

Could someone who knows give a rundown of the differences and 
similarities, pros and cons?

Thank you,
Rich Hammer
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