Enhance application using struts2.x

hi guys

this is my current project structure and we are using Struts 1.x
Jsp(using struts tags, JSTL tags)--> Dynavalidatorform --> Action class (set values in Value object)-->Ejb-->Dao-->database

we are planning to migrate to struts 2.x.
I have the following questions:
1) i would like to know how the above structure would change.
2) Does Struts2.x support DynavalidatorForm?  ( What is all this hype about POJO in struts2.0? )
3) while migrating from 1.x to 2.x , do i have to change my struts.jar and other jar files?

**I would appreciate responces from anyone who has practically worked with struts2.0
any opensource sample project code would be helpful.

thanks v much,
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