The javax.servlet package contains a number of classes and interfaces that
describe and define the contracts between a servlet class and the
runtime environment provided for an instance of such a class by a
conforming servlet container.
The javax.servlet.annotation package contains a number of annotations
that allow users to use annotations to declare servlets, filters,
listeners and specify the metadata for the declared component.
The javax.servlet.http package contains a number of classes and interfaces
that describe and define the contracts between a servlet class
running under the HTTP protocol and the runtime environment provided
for an instance of such a class by a conforming servlet container.
Provides the ELResolver classes that define the
object resolution rules that must be supported by a JSP container
with the new unified Expression Language.