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jsp:useBean id not clear

 
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Hi, I am not clear how <jsp:useBean> id is working. Here is the complete working code. Can you please explain me how id portion from each file is communicating ?

MurachPage303.jsp



AddToEmailListServlet.java



User.java


MurachPage305.jsp


web.xml




 
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The id is the name by which the scoped variable is being bound into the session.
 
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