What do you mean by a filter and how does it work?
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Which event is fired at the time of setting, getting or removing attribute from application scope?
what is the difference between Servlet and JSP?Advantage of JSP over Servelt?Any concept present in JSP which we cant implement in Servlet?
31 Answers ABC, Apere, AZTEC, CTS, CybAge, iFlex, Impact Systems, Sara, TCS,
What must be implemented by all servlets?
Explain the methods of request dispatcher in servlet?
What are the classes and interfaces for servlets?
Is it possible to send a mail from a servlet? Explain?
What is servlet context ?
What's the architecture of a servlet package?
What are the different session tracking techniques?
Why session tracking is needed?
What is called a session?
Is JSP Thread Safe ???? How To make JSP thrad safe ?????
Core Java 
