Migration from jsf 1.1 to jsf1.2

Question

I am trying migrate our application built on JSF 1.1 to JSF 1.2. I am facing lot of porblems during this migration.
Why are the tag classes marked final in JSF 1.2. We have many Tag classes written in our application overriding these tag classes. Is there any other way of overriding the behaviour of JSF 1.2 tag classes apart from overriding it.
I also see from the source code, that the tag classes are all generated code. Does it mean we can regenerate it using some build file and make the tag classes non-final.
Please help.
Thanks in advance,
Yetish

Answer 1

I agree to your point that we need program to an interface and not to an implementation class. But in JSF 1.2 scenario, even if we go ahead and implement it using object composition, we cannot use the Tag classes because of the fact that most of the important methods are marked protected (ex setProperties method of Tag classes) and hence cannot be invoked.
These methods can be overridden only by a subclass and we cannot subclass a final class.
I think if the idea is not to override a specific behaviour then that behaviour shoud be made final preventing from overriding and not declare the entire class final.
Your thoughts please.