2015 UJUG, MVC 1.0 portion

MVC 1.0
Manfred Riem (@mnriem)
Oracle
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M

Agenda
MVC
MVC 1.0 JSR
Some examples
MVC tooling
Questions and Answers
1
2
3
4
5
E

What is MVC?
• MVC is a pattern used to implement a user interface (UI).
• It consists of 3 major components
– Model (M)
– View (V)
– Controller (C)
• Each of the components has a distinct responsibility which is covered in the
next slides

The M(odel) in MVC
• The model is the interim state you want to keep when you are building an
application that shows a user interface
• Examples
– Who is logged in
– What are they trying to buy
– What page are they on in a multi page flow

The V(iew) in MVC
• The view is what your user interacts with
– In a web application that would be the web page or web pages
• your JSP page
• your CSS styles
• your JavaScript
– In a thick client scenario it would be the entire UI
– In an embedded scenario it could be the touch screen, hardware buttons etc.

The C(ontroller) in MVC
• The controller is the work horse of the pattern, as it:
– Executes the business logic
• Run a credit card transaction
– Updates the model
• Mark the transaction as successful in the model object
– Ask the view to render itself
• Shows the transaction was successful

Different styles of MVC
• Component-based MVC
• Action-based MVC
• Other styles

Component-based MVC
• A specific style of MVC made popular by component frameworks
• Controller provided by the framework
• Some examples
– Java Server Faces (in the JavaEE platform)
– Seam (discontinued)
– Wicket
– Tapestry
– Apache Click (retired)

Action-based MVC
• Controller(s) defined by the application
• Currently no JavaEE implementation
– Good news we are creating one!
• Some examples
– Struts 1 (end of life)
– Struts 2
– Spring MVC

Action-based MVC
– Manual request parameter processing
– No view kept around
– Limited support for re-usable behavior
– Developer responsible for all HTML /
JavaScript
– No automatic input conversion
– No automatic input validation
– Request centric
Component-based MVC
– Automatic request parameter
procession
– View kept around
– Component libraries that implement
re-usable behavior
– Components render HTML / JavaScript
– Automatic input conversion
– Automatic input validation
– Page centric
Compare and contrast

Agenda
MVC
MVC 1.0 JSR
Demos
Recap
Questions and Answers
1
2
3
4
5
E

The MVC 1.0 JSR
• It really is the “Action-based” MVC 1.0 JSR
• Where it this coming from?
– JavaEE 8 survey
– Talking to our customers
– UI landscape is not one size fits all
• Who is supporting it?

List of supporters
• Joshua Wilson (Red Hat)
• Woong-ki Lee (TmaxSoft)
• Josh Juneau
• Fabio Velloso (SouJava)
• Yara Senger (SouJava)
• Bruno Souza (SouJava)
• Markus Karg
• Antonio Goncalves
• Rajmahendra (JUGChennai)
• Francisco Sokol
• Werner Keil
• Martijn Verburg (London Java
Community)
• And of course Oracle
(see JCP page)

Where and how?
• Where are we at?
– The first Early Draft has just been published
– Our first Milestone release is available
• How can I help?
– Join the users@mvc-spec.java.net mailing list and comment
– Participate in the Adopt-a-JSR program (JUGs)
– Test out milestones / snapshots from the RI website
(http://ozark.java.net) and file issues if something is not working
– Tweet, blog, socialize to raise awareness about MVC 1.0

An example about the EG process
• How are we going to protect against Cross-Site Request Forgery?
• Since the users@mvc-spec.java.net mailing list gets every mail the EG sends
you can follow all the discussions happening
• What do you think?
– Tell us on the mailing list
– Tweet about it
– Talk to me after the session
• Why do I ask?

Demos
• Switching gears and showing you where we are at!

Recap
• Doing MVC now is not a bad idea, because we are:
– We are leveraging CDI
– We are leveraging Facelets
– We are delivering an easy migration path if you are using JSPs
– We will be leveraging Servlet 4.0 (ServerPush)
• Can you get involved? Yes, how:
– Join our users mailing list
– Tweet about MVC
– Blog about MVC
– Test out SNAPSHOT and milestone builds from https://ozark.java.net

Recap (continued)
• View Engines
– JSP
– Facelets
– FreeMarker*
– Mustache*
– Thymeleaf*
– Velocity*
– Handlebars*
* Delivered and supported by MVC community, not required by the MVC specification

Links
• MVC specification
– Website http://mvc-spec.java.net
– Users Mailing List users@mvc-spec.java.net
• MVC implementation
– Website http://ozark.java.net
– Users Mailing List users@ozark.java.net
• Spec leads
– Santiago (@spericas)
– Manfred (@mnriem, https://www.java.net/blogs/mriem, http://mvc.zeef.com/manfred.riem )

Questions?
• Ask them now
• Talk to me afterwards

2015 UJUG, MVC 1.0 portion

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