Actually Servlet don't have these implicit Objects After
introducing of JSP it contains by default and with ready made Objects to
use in our web applications.
These are available for programmer through Container. The
implicit objects are parsed by the container and inserted into the
generated servlet code. They are available only within the jspService
method and not in any declaration. Implicit objects are used for
different purposes. Our own methods (user defined methods) can't access
them as they are local to the service method and are created at the
conversion time of a jsp into a servlet.
These are 9 implicit Objects
request
response
page
pageContext
application
exception
out
config
session
