Java/Struts interview questions: - Distinguish between Struts 1.x and Struts 2.x

Struts 1.x	Struts 2.x
Configuration of ActionServlet via servlet	Configuration of FilterDispatcher is via  filters
Struts1 extends the abstract base class by its action class	Implements Action interface but not acompulsion. Any POJO class can behave like Action
Follows FrontController pattern	Follows FilterDispacther pattern
Extra care has to be taken to make resources thread safe because Actions are singletons	Action objects are instantiated for each request and hence are inherently thread safe
Testing is a problem since execute() method exposes Servlet API	Testing is easier
ActionForms serves are input	Any POJO can serve as input
Binds objects in page using standard mechanism	Binds objects using valuestack
Type conversions are using common -beanutils.jar	Type conversions are using OGNL
General notation for config file is Struts-config.xml is used	General notation for config file is struts.xml
No concept of namespace	Namespace are readily available for modularity

Also see the following interesting video on Struts: -

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