Differences between servlet and backing bean

Could anyone please tell me whether everywhere that servlet can be used, backing bean and JSF can be used too? Are JSF and backing beans the new alternatives for JSP and servlets? please clarify the relations between these concepts for me.
Thanks
Laura

Laura_Jlover wrote:
Thank you. You mean backing beans can do every thing that servlets can do? Yes.
JSF pages can work with servlets? Strictly speaking, every JSF page gets passed through the FacesServlet which does all the task. The lifecycle, creating the FacesContext, putting the request parameters in backing beans, rendering the response, etcetera.
what are the advantages of servlet and the advantages of backing beans? what's the disadvantages? In general, which one is better?In context of JSF, you should be using backing beans, not Servlets. There is nothing what a Servlet can offer you as an advantage in the JSF context. It is simply not an option/alternative. You can't even call a Servlet (directly) using a JSF h:form. You, however, can access backing beans in any JSP or Servlet outside the JSF context.
Just carefully read the JSF specification or buy a JSF book and the picture will be clear.
JSF spec: [http://jcp.org/aboutJava/communityprocess/final/jsr252/index.html].
JSF book: [http://www.amazon.com/JavaServer-Faces-Complete-Reference/dp/0072262400].

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