I am fairly new to Spring. I see that current release of Spring is 3.0 but all the references and books available are
related to 2.5. Only spring documentation is upto 3.0. Though its very complete as well.
I would like to know, which book should i follow? Is it okay to following Pro Spring 2.5 as Spring 3 version is released.
I have seen that i learn things when i implement not just theory. So what kind of starting projects i can do to understand
this framework more comprehensively. What kind of time-frame is needed?
First, I 100% agree with Mark (Spritzler). If you can, take the class. It's a great way to go from 0 -> compitent in a very short time. From there, you just need to put it into practice to really get productive.
There are a few books out now based on Spring 3.0. I'm really looking forward to the SIA 3.0 book but there is already the Spring Recipes 2nd edition, which covers Spring 3.0. I have it on order so haven't read through it yet. If it's anything like the first edition, it should be pretty good.
If you have the tenacity, the Spring 3.0 documentation is quite good but you have to get through a lot of material before really getting to the point of understanding well enough to be productive. I started on Spring 2.5 and migrated over to 3.0 so the reference docs were nearly enough for me.