Major Diffrences Between Struts 1.X and Struts 2.x

Let us see the component and functional differences between struts 1.x and struts 2.x.

Struts1.x	Struts2.x
1).   In struts 1.x front controller is ActionServlet	1)In 2.x front controller is FilterDispatcher.
2)In struts 1.x we have RequestProcessor class	In 2.x we have Interceptors instead RequestProcessor will see about this concept later just remember as   of now.
In struts 1.x we have multiple tag libraries like, html, logic, bean..etc	In 2.x we do not have multiple libraries, instead we have single library which includes all tags
In struts 1.x the configuration fine name can be [any name].xml and we used to place in web-inf folder	In 2.x the configuration file must be struts.xml only and this must be in classes folder
In struts 1.x we have form beans and Action classes separately	In 2.x form bean, Action classes are combinedly given as Action class only, of course we can take separately if we want .
In struts 1.x properties file must be configured in struts-config.xml	But in 2.x we need to configure our resource bundle(s) in struts.properties file
In struts 1.x we have programmatic and declarative validations only	In 2.x we have annotations support too along with programmatic and declarative validations
Functional Differences:
In struts 1.x declarative validations are done by using validation frame work	In 2.x, declarative validations are done by using xwork2 frame work by webwork the reason being, its support valuations through Annotations
In struts 1.x an Action class is a single ton class, so Action class object is not a thread safe, as a programmer we need to make it as thread safe by applying synchronization	In 2.x an Action class object will be created for each request, so it is by default thread safe, so we no need to take care about safety issues here
In struts 1.x we have only jsp as a view technology	In 2.x we have support of multiple view technologies like velocity, Freemarker, jasper reports, jsp etc…
In struts 1.x Action class is having servlet dependency, because in execute() method accepts req, res parameter right !	Here, In 2.x Action class doesn’t have any servlet dependency, because its execute() method doesn’t accepts any parameters, however we can access all servlet objects with dependency injection