Re: what about adding spring ?

> Please tell me your opinion. Would it be a clever move ? Or am i introducing
> just another layer of complexity ?

I have a high regard for Spring, although I should probably disclose
that I'm currently contracting for SpringSource. Unlike Jon, I have
found that projects with Spring tend to be easier to understand and
maintain than ones without any IoC framework at all, but there's
nothing stopping you from writing convoluted inter-dependencies. There
is also good documentation for it and a big user base. The biggest
downside is the XML bean descriptor, but you can now use annotations.

Remember though, it's not just an IoC framework that you get with
Spring: there's a bunch of other stuff too. Just check out the
reference guide for more info. In particular, you might be interested
in Spring MVC (like Struts 2) which can happily work with Velocity
templates. It's AOP support can be quite handy too, particular for
transactions.

As to your final question, if you're replacing one IoC container
(yaafi) with another (Spring), that could hardly be seen as an extra
layer of complexity :)

In the end, I think you need to find something that you're going to be
productive with, otherwise development will be slow.

Regards,

Peter