The Servlet 3.0 specification defines a number of annotation types which can be used to declare servlets, filters, listeners, security constraints and other metadata within Java source files as an alternative mechanism to XML declaration in web deployment descriptor file (web.xml).

The following table lists all annotation types available in Servlet 3.0. Click on an annotation type to see its syntax, attributes description and code examples:

Annotation type

Equivalent XML elements in web.xml

HandlesTypes

None

HttpConstraint

<http-method-exception>

HttpMethodConstraint

<http-method>

MultipartConfig

None

ServletSecurity

<security-constraint>

WebFilter

<filter>, <filter-mapping>

WebInitParam

<init-param>

WebListener

<listener>

WebServlet

<servlet>, <servlet-mapping>

All the annotation types listed in the above table are declared in the package javax.servlet.annotation.

Recommended Book: Servlet & JSP: A Tutorial (A Tutorial series)