MVC 1.0 / JSR 371

MVC 1.0JavaLand March 2015

David Delabassee @delabassee Oracle

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Lorem ipsum dolor sit amet, MVC, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua, Action-‐Based MVC. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. JSR 371 duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Ozark excepteur sint occaecat cupidatat non proident.

My Own Statement

Agenda

Context

MVC 1.0 JSR

Conclusion

Agenda

Context

MVC 1.0 JSR

Conclusion

Java EE 7

ENTERPRISE EDITION

• Batch • Concurrency • Simplified JMS

• More annotated POJOs • Less boilerplate code • Cohesive integrated platform

DEVELOPER PRODUCTIVITY

• WebSockets • JSON • Servlet 3.1 NIO • REST

MEETING ENTERPRISE

DEMANDS

Java EE 7

Java EE 8

Mobile

HTTP/2

SECURITYReactive Programming

User Experience

Java EE 8 Community Survey

Should Java EE provide support for MVC alongside JSF?

Is there any one de-‐facto standard technology in this space to which we should look for inspiration?

Community-‐Prioritized Features

http://glassfish.org/survey

What is MVC?• Pattern used to implement a User Interface • Consists of 3 major components

–Model – View – Controller

• Each of the components has a distinct responsibility

The M(odel)• Interim state you want to keep when you are building an UI • Examples

–Who is logged in –What are they trying to buy –What page are they on in a multi page flow

The V(iew)• 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)• Work horse of the pattern:

– 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 • Others

Component-‐based MVC• A specific style of MVC made popular by component frameworks • Controller provided by the framework • Examples

– JavaServer Faces –Wicket – Tapestry – Seam (discontinued) – Apache Click (retired)

Action-‐based MVC• Controller(s) defined by the application • Examples

– Struts 1 (end of life), Struts 2 – Spring MVC

• No standard Java EE implementation – Good news we are creating one! – Targeted for inclusion in Java EE 8

Action-‐based MVC

–Manual request parameter processing – No view kept around – Request centric – Developer responsible for all HTML / JS – Limited support for re-‐usable behavior – No automatic input conversion – No automatic input validation

Component-‐based MVC

– Automatic request parameter processing – View kept around – Page centric – Components handle HTML / JS – Component implement re-‐usable behavior – Automatic input conversion – Automatic input validation

Compare and contrast

Agenda

Context

MVC 1.0 JSR

Conclusion

Model-‐View-‐Controller (MVC 1.0) Specification

• “Action-‐based” MVC 1.0 JSR • Why?

– UI landscape is not one size fits all – Java EE 8 Community Survey – Talking to our customers, etc.

• EG formed –Oracle, RedHat, innoQ, IBM, Caelum, LifeRay, and 6 individuals members

• You can contribute too!

JSR 371

Model-‐View-‐Controller (MVC 1.0) Specification

• Ozark – https://ozark.java.net

• Open Source – git://java.net/ozark~sources – https://github.com/spericas/ozark

Reference Implementation

MVC 1.0

• Action-‐based MVC • Glues together key Java EE technologies

–Model : CDI, Bean Validation, JPA – View : Facelets, JSP, more? – Controller : Invent new technology Vs. Leverage existing technologies

Principles

Controller• Combine data models and views to produce web application pages

@Path("hello") public class HelloController {

@GET@Controllerpublic String hello() {

return "hello.jsp";}

Controller• Class/method decorated with @Controller

@Path(“hello") @Controller public class HelloController {

@GET@View(“hello.jsp")public void hello() { }

Controller

@Path(“hello") @Controller public class HelloController {

@GETpublic Viewable hello() {

return new Viewable("hello.jsp"); } }

Controller

… @GET @Controller public Response getById(@PathParam("id") String id) { if (id.length() == 0) { return Response.status(Response.Status.BAD_REQUEST) .entity(“error.jsp") .build(); } }

Model• “Refers to the data” • 2 types

– javax.mvc.Models interface – CDI @Named bean (recommended)

Model @Named(“greeting”) @RequestScoped public class Greeting {

private String message;

public String getMessage() { return message;

} public void setMessage(String message) { this.message = message; }}

@Path(“hello”) public class HelloController {

@Inject private Models models;

@GET @Controller public String hello() { models.set(“greeting”, new Greeting(“Hi JavaLand”)); return “hello.jsp”; } }

View• Define the structure of the output • Can refer to model(s) • Rendered by a View Engine

– JSP – Facelets

• Not accessible as static resources – /WEB-‐INF/views/

<%@ page contentType=“text/html;charset=UTF-8” language=“java” %> <html> <head> <title>Hello</title> </head> <body> <p>Hello ${user.name}</p> </body> </html>

View Engine• CDI based extension mechanism • javax.mvc.engine.ViewEngine interface

boolean supports(String view);

void processView(ViewEngineContext context)

throws ViewEngineException;

• Ozark – JSP & Facelets – FreeMarker, Velocity, Thymeleaf, Mustache & Handlebars

Miscellaneous• Bootstrap

– javax.ws.rs.core.Application

• Validation • Exception Mapping Providers • @Produces • CDI Events • Tooling

Demos?

Lorem ipsum dolor sit amet, Intial consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua, Ozark Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Velit duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. milestone build excepteur sint occaecat cupidatat non proident.

Agenda

Context

MVC 1.0 JSR

Conclusion

Conclusion• Doing MVC now is not a bad idea, because we are:

– Leveraging CDI, JAX-‐RS, Facelets, BV –More? Servlet 4.0’s ServerPush – Delivering an easy migration path if you are using JSPs

• Offers more choices • New annotations

–@Controller –@View

Java EE 8

• Java EE 8 Platform (JSR 366) • CDI 2.0 (JSR 365) • JSON Binding 1.0 (JSR 367) • JMS 2.1 (JSR 368) • Java Servlet 4.0 (JSR 369) • JAX-‐RS 2.1 (JSR 370)

• MVC 1.0 (JSR 371) • JSF 2.3 (JSR 372) • Java EE Management 2.0 (JSR 373) • JSON-‐P 1.1 (JSR 374) • Java EE Security 1.0 (JSR 375)

So far…..

Roadmap• Q3 2014 Expert Group formed • Q1 2015 Early Draft • Q3 2015 Public Review • Q1 2016 Proposed Final Draft • Q3 2016 Final Release

Contribute!• Join the JCP • “Adopt-‐A-‐JSR”

– http://glassfish.java.net/adoptajsr

• Get involved – Join MVC users mailing list – Tweet, blog, socialize to raise awareness about MVC 1.0 – Test MVC SNAPSHOT and milestone builds (https://ozark.java.net) – Fill issues!

Links• MVC specification

– http://mvc-‐spec.java.net, users@mvc-‐spec.java.net

• MVC implementation – http://ozark.java.net, users@ozark.java.net

• Spec leads – Santiago (@spericas) –Manfred (@mnriem, http://mvc.zeef.com/manfred.riem )

• The Aquarium Blog – https://blogs.oracle.com/theaquarium/

Danke!

MVC 1.0 / JSR 371

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