palas das

What is the use of 3rd party jar file?
What is the use of META-INF?

Can anybody explain : JSP page cached by browser
What it means?

what is the use of <html:hidden name="" property="" />?
explain.

What is the use of hibernate tamplate?

When we need to implement Serializable interface by a class??

What is the difference between FilterDispatcher and ActionServlet?

Actually I have created one action class , one jsp,two field for input,and one validation.xml file. field-validator type="requiredstring"> for this line in the xml file anything I have to do or not?

Can anybody give a simple example how spring AOP works?

When we should use "identity" as generator class for id column.