How Servlet 3.1 differs to Servlet 3.0

Question

Is servlet 3.1 under JavaEE 7?

Which version of eclipse supports servlet 3.1 development?

Answer 1

Servlet 3.1 vs Servlet 3.0 along with others too

+=============+================+====================+=============================================================================+
|   VERSION   |      DATE      |   JAVA EE / JDK    |                             FEATURES / CHANGES                              |
+=============+================+====================+=============================================================================+
| Servlet 3.1 | May 2013       | JavaEE 7           | Non-blocking I/O, HTTP protocol upgrade mechanism                           |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
| Servlet 3.0 | December 2009  | JavaEE 6, JavaSE 6 | Pluggability, Ease of development, Async Servlet, Security, File Uploading  |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
| Servlet 2.5 | September 2005 | JavaEE 5, JavaSE 5 | Requires JavaSE 5, supports annotation                                      |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
| Servlet 2.4 | November 2003  | J2EE 1.4, J2SE 1.3 | web.xml uses XML Schema                                                     |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
| Servlet 2.3 | August 2001    | J2EE 1.3, J2SE 1.2 | Addition of Filter                                                          |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
| Servlet 2.2 | August 1999    | J2EE 1.2, J2SE 1.2 | Becomes part of J2EE, introduced independent web applications in .war files |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
| Servlet 2.1 | November 1998  | Unspecified        | First official specification, added RequestDispatcher, ServletContext       |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
| Servlet 2.0 |                | JDK 1.1            | Part of Java Servlet Development Kit 2.0                                    |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+
| Servlet 1.0 | June 1997      |                    |                                                                             |
+-------------+----------------+--------------------+-----------------------------------------------------------------------------+

Source

Answer 2

Is servlet 3.1 under JavaEE 7?

Servlet 3.1 is introduced with JavaEE 7.

How Servlet 3.1 differs to Servlet 3.0?

Regarding the new changes in Servlet 3.1, read this blog post by Arun Gupta: What's new in Servlet 3.1 ? - Java EE 7 moving forward

And I also want to know which version of eclipse support servlet 3.1 development.

The new version of Eclipse 4.3 (named Kepler) supports Java EE 7 technologies. See Arun Gupta's blog post: Java EE 7 support in Eclipse 4.3

Answer 3

In addition to the answer given by Eng.Fouad: Servlet 3.1 was indeed introduced with Java EE 7, but it's also implemented standalone by various servers that are themselves not Java EE products, e.g. Tomcat 8 or Jetty 9.1.

As for the changes, I collected a number or articles on my ZEEF page that are specifically about the new things in Servlet 3.1.

As a short summary; non-blocking IO and some security features like the '*' role and the possibility to deny HTTP methods not explicitly covered by security constraints were some of the major changes.