Play Framework: Intro & High-Level Overview

Intro to Play Framework &

Modern Java Web App Development
Josh Padnick

Desert Code Camp 2013.2

November 9, 2013

Today’sTalk
• Java Web App DevelopmentToday

• Modern Web App Development

• Meet Play Framework

• Build Stuff!

• Founder & Chief Innovation Ofﬁcer at Omedix

• 10+ years of web app development

• Special interest in scalable, enterprise, web-based
applications using Java & open source
Josh

Java Web App

DevelopmentToday
Challenges

Lots ofTime Waiting for Server Redeploys…
SOURCE FOR INSIGHT:The Play Framework at LinkedIn: Productivity and Performance at Scale byYevjeniy Brikman 
http://www.youtube.com/watch?v=8z3h4Uv9YbE

!
SOURCE FOR GRAPHIC: http://zeroturnaround.com/rebellabs/java-ee-productivity-report-2011/#redeploy_times

Long, Ugly Error Messages
SOURCE: FOR INSIGHT:The Play Framework at LinkedIn: Productivity and Performance at Scale byYevjeniy Brikman 

!
SOURCE FOR GRAPHIC: http://ptrthomas.wordpress.com/2006/06/06/java-call-stack-from-http-upto-jdbc-as-a-picture/

MVC Action
AOP TX Proxy
Business Logic
DAO
Spring-Hibernate
Hibernate
JDBC
Spring WebFlow
Spring MVC

?xml version=1.0 encoding=UTF-8?
web-app version=2.5 xmlns=http://java.sun.com/xml/ns/javaee xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance
xsi:schemaLocation=http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd
!
servlet
servlet-namemvc/servlet-name
servlet-classorg.springframework.web.servlet.DispatcherServlet/servlet-class
!-- we'll use AnnotationConfigWebApplicationContext instead of the default XmlWebApplicationContext... --
init-param
param-namecontextClass/param-name
param-valueorg.springframework.web.context.support.AnnotationConfigWebApplicationContext/param-value
/init-param
!
!-- ... and tell it which class contains the configuration --
init-param
param-namecontextConfigLocation/param-name
param-valuecom.zt.helloWeb.init.WebappConfig/param-value
/init-param
!
load-on-startup1/load-on-startup
!
/servlet
!
servlet-mapping
servlet-namemvc/servlet-name
url-pattern//url-pattern
/servlet-mapping
!
welcome-file-list
welcome-file//welcome-file
/welcome-file-list
!
/web-app
DefaultServletHandler
Crazy XML Conﬁguration
SOURCE FOR INSIGHT:The Play Framework at LinkedIn: Productivity and Performance at Scale byYevjeniy Brikman 

Bean Failures
org.omg.CORBA.OBJECT_NOT_EXIST
SOURCE FOR GRAPHIC: Beginning Java EE 6 Platform with Glassﬁsh 3 by Antonio Goncalves, Page 5.
X

Clunky Road to

RESTful URLs
WEB.XML
servlet-mapping
servlet-namespringmvc/servlet-name
url-pattern/rest/*/url-pattern
/servlet-mapping
!
CONTROLLER.JAVA
@Controller
@RequestMapping(/people)
public class PeopleController {
!
@RequestMapping(“entrypoint/{collectionName}”, method=RequestMethod.GET)
public @ResponseBody String getPeople() {
return GsonFactory.getInstance().toJson(LookupDao.getInstance().getP
}
!
@RequestMapping(value={id}, method=RequestMethod.GET)
public @ResponseBody String getPerson(@PathVariable String id) {
return GsonFactory.getInstance().toJson(LookupDao.getInstance().getP
}
}

I just want to write working software!

Is this the architecture we would create today?

The root of the problem
Impedance Mismatch between

HTTP and Java EE!

RESTful URLs vs. Java Servlets Spec
Impedance Mismatch

Stateless HTTP vs. Stateful EJBs
SOURCE: http://cscie12.dce.harvard.edu/lecture_notes/2011/20110504/handout.html

SOURCE: Beginning Java EE 6 Platform with Glassﬁsh 3 by Antonio Goncalves, Page 206.

Impedance Mismatch

Impedance Mismatch
Code Refresh vs. WAR Deployment

Buzzwords!
• HTML5 Javascript
• MVVM Frameworks
• Mobile
• NoSQL
• Real-Time
• Big Data
• Asynchronous
• Immutability
• Connected Devices

Reactive Software
http://www.ReactiveManifesto.org/

The Reactive Manifesto
“Application requirements have changed dramatically in recent years. Both
from a runtime environment perspective, with multicore and cloud computing
architectures nowadays being the norm, as well as from a user requirements
perspective, with tighter SLAs in terms of lower latency, higher throughput,
availability and close to linear scalability.This all demands writing applications in
a fundamentally different way than what most programmers are used to.”
SOURCE: http://typesafe.com/blog/why_do_we_need_a_reactive_manifesto
Jonas Bonér

Reactive Software
SOURCE: http://www.ReactiveManifesto.org/

Goal: Performance + Productivity
Performance
Productivity
SOURCE: http://typesafe.com/blog/webinar-a-java-developers-primer-to-the-typesafe-platform

No More JEE Container
SOURCE: Play for Java by Nicolas Leroux and Sietse de Kaper

Focused on Developer Productivity
• Live code changes when you refresh the browser

• More friendly error messages directly in browser

• Type safety in the templates

• Cool console build tools

Designed for the Modern Web
• RESTful by default

• Auto-compile LESS and CoffeeScript ﬁles

• JSON is a ﬁrst-class citizen

• Websockets, other HTTP Streaming Support

Stateless and Built for Scale
• Forces every aspect of your app to be stateless

• Non-Blocking I/O

• Well-suited for real-time

What exactly is it, though?
SOURCE: Play for Java by Nicolas Leroux and Sietse de Kaper

What exactly is it, though?
Integrated HTTP Server

JBoss Netty (Non-Blocking IO)
Concurrent, Distributed, Fault-Tolerant

Background Processing

Akka
Build System

Console

SBT
JavaVirtual Machine
Template Engine, HTTP Request/Response Processing, Integrated
Cache, RESTful Routing Engine,Asset Compilation,
Internationalization,TestingTools

Play Framework
eBean / Anorm
BoneCP
H2 Database
Lots of libraries…

Of course, nothing’s perfect
1. You can mostly avoid Scala, but not completely 
(of course, Scala itself is pretty cool)

2. For advanced build logic, SBT has a steep learning curve

3. Template system works well, but sometimes the functional
paradigm can feel awkward

Intro Stuff
1. Download and install

2. Play Console

3. Controllers

4. URL Routing

5. Templates

Intro Stuff
2. Play Console

3. Controllers

4. URL Routing

5. Templates

Intro Stuff

2. Play Console
3. Controllers

4. URL Routing

5. Templates

Intro Stuff

2. Play Console

3. Controllers
4. URL Routing

5. Templates

Intro Stuff

2. Play Console

3. Controllers

4. URL Routing
5. Templates

Let’s Build Something

in theTime Remaining

So what did you like best today?
• We’ll take some votes and show the results real-time

Learning Play Framework
• I preferred the books to the documentation

• For ofﬁcial documentation, best formatting is on
playframework.com. Latest content is on github 
(https://github.com/playframework/playframework/tree/master/documentation/manual)

• Community itself is pretty great

• Google Group is great

• Lots of questions on Stack Overﬂow

Play Framework: Intro & High-Level Overview

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