Play

Play Framework
(Fun is back in Java)
@basav

Saturday, December 8, 12

About Me
• Just another Java developer
• have experienced JSP, Struts2, Spring MVC,
JSF etc
• Fed up with complex Java EE environment
for simple Web apps
• Current Interests
• Clojure, Play, Cloud..

Agenda
• Background - 5 mins
• Why Play! Framework? - 10 mins
• Features and Beneﬁts - 15 mins
• Demo - 10 mins
• Q &A


Web is taking over..
• Web is providing data on
HTTP not just web pages
• Browser is acting as an
Operating system
• Javascript has become very
powerful
• Webapps are alive


Is Java Development
Fun(for webapps)??


Compared to


Compared to

Not Anymore....

Web frameworks
Non Java Java based


Non Java Web
frameworks


Non Java Web
frameworks
• Are popular


Non Java Web
frameworks
• Are popular

• HTTP is ﬁrst class
citizen


Non Java Web
frameworks
• Are popular

citizen

• Rapid Development


Non Java Web
frameworks
• Are popular

citizen


• Rapid Deployment


Non Java Web
frameworks
• Are popular

citizen



• Less code


Non Java Web
frameworks
• Are popular

citizen



• Less code

• JVM Ecosystem


Java Web frameworks


Java Web frameworks
• on JVM


Java Web frameworks
• on JVM

• Standard based


Java Web frameworks
• on JVM

• Standard based

• Implement Heavy
Servlet Specs


Java Web frameworks
• on JVM

• Standard based

• Implement Heavy
Servlet Specs

• Embrace HTTP


Java Web frameworks
• on JVM

• Standard based

• Implement Heavy
Servlet Specs

• Embrace HTTP



• Less More code


Where is the GAP and
What we Need?


What we Need?
• HTTP as First Class Citizen


What we Need?


What we Need?
+


What we Need?
+
• on JVM Ecosystem (i.e. Pure Java Support)

Conventional Java EE
Stack for Web Apps
• Complex

• Lots of

• Specs and Implementations

• Conﬁgurations

• Layered

• Deﬁned by Standards / Specs

• Assembled by Interfaces


Conventional Java EE
Stack for Web Apps
• Complex

• Lots of

• Specs and Implementations
OVER ARCHITECTED
• Conﬁgurations
• Layered

• Deﬁned by Standards / Specs

• Assembled by Interfaces


Why?

“Java developers are building
Java applications, not web
applications”


Why?
“Java culture emphasis
interfaces and layers of
abstraction over solving
problems directly.”


What about Developer
Productivity?


What about Developer
Productivity?

• code change -> run Maven / Ant -> build war
-> copy-> Deploy -> wait (sometimes server
restart) -> open-browser-> test
(Try developing something on Webpshere, you understand what I mean)


Developer Productivity



• important



• important
• is of economic value



• important
• Lets not pay for compile-test-deploy
cycle



• important
• Lets not pay for compile-test-deploy
cycle
• more importantly - Lets not bore them

What we Need?
• HTTP as First Class • Rapid Development
Citizen

+


What we Need?
Citizen

+
• Developer Productivity


What we Need?
Citizen

+
• Developer Productivity
=


pure Java Web Framework
• https://github.com/playframework/play.git


• Founded by Guillaume Bort in 2007
• 500,000+ downloads, and counting

• 3000+ questions tagged in stackoverﬂow

• 7000+ members on Play google groups
• ~7000 topics
• 100+ modules


Play is


Play is
• Full Stack Framework (from compilation to
deployment)


Play is
deployment)
• Stateless Architecture


Play is
deployment)
• Not Based on Servlet API


Play is
deployment)
• RESTFul Architecture


Play is
deployment)
• Shared Philosophy - Heavily borrowed from
Rails / Django


Play is
deployment)
• Shared Philosophy - Heavily borrowed from
Rails / Django
• Web Framework - Not a Java Framework!!

Play History

• Started with Servlet and JSP

Play History
• Servlet and JSP replaced by
custom Classloader
• Introduced Python support
• Groovy for Templates
• Async IO


Play History
Introduced
• Ivy For Build
• Websockets
• Scala


Play History
Introduced
• Ivy SBT
• Groovy Scala Templates
• Akka for middleware
• First class support for
Scala


Our focus for Today is
on Play 1.2.5


Full Stack...


Full Stack...
• Full Stack - everything “needed” is bundled
JDT Compiler JPA


Full Stack...
• Full Stack - everything “needed” is bundled
JDT Compiler JPA

Can be packaged as standard WARS and
deployed in Servlet Containers


What’s in there?


What’s in there?
org.eclipse.jdt.core-3.6.0.jar


What’s in there?
org.eclipse.jdt.core-3.6.0.jar

netty-3.2.4.Final.jar
aync-http-client-1.6.3.jar


What’s in there?
hibernate-entitymanager-3.6.0.jar
hibernate-jpa-2.0-api-1.0.0.Final.jar
jta-1.1.jar
myql-connector-java-5.1.13.jar
postgressql-9.0.jar
h2-1.3.149.jar


What’s in there?

joda-date-time
mem-cache
groovy

jamon-2.7.jar


What’s in there?
commons-lang
commons-ﬁleupload
commons-io
commons-collections
commons-logging
commons-email
commons-codec
commons-beanutis


My top 10 features


My top 10 features
• Pure Java


My top 10 features
• Pure Java

• Starts fast, runs fast


My top 10 features
• Pure Java


• No compile, deploy,
restart cycle - Fix the
bug and hit reload!


My top 10 features
• Pure Java


bug and hit reload!

• URL Routing


My top 10 features
• Pure Java


bug and hit reload!

• URL Routing

• HTTP Parameter
Binding


My top 10 features
• Pure Java


bug and hit reload!

• URL Routing

• HTTP Parameter
Binding

• Share nothing system -
no state in the server


My top 10 features
• Pure Java

• Exact errors (including
• No compile, deploy, line numbers, even for
groovy templates)
bug and hit reload!

• URL Routing

• HTTP Parameter
Binding



My top 10 features
• Pure Java

groovy templates)
bug and hit reload!
• Extensible by modules
• URL Routing

• HTTP Parameter
Binding



My top 10 features
• Pure Java

groovy templates)
bug and hit reload!
• URL Routing
• Super Testing support
• HTTP Parameter
Binding



My top 10 features
• Pure Java

groovy templates)
bug and hit reload!
• URL Routing
• Super Testing support
• HTTP Parameter
• Easy deployment on
Binding
Cloud


URL Routing & HTTP Parameter binding



http://www.myapp.com/items/233




GET /items/{id} Application.show





public static show(Long id) {
Item item = Item.ﬁndById(id);
render(item);
}





public static show(Long id) {
Item item = Item.ﬁndById(id);
render(item);
}

<div><b>Item : </b>${item.name}</div>



POST /items/save Application.save




<form action="@{Application.save}" >
<input type="hidden" name="item.id" value="${item.id}">
<input type="text" name="item.name" />
<input type="submit" value="Submit" />
</form>
public void save(Item item) {
item.save();
show(item.id);
}

Stateless Architecture
• “Share Nothing” Philosophy - Nothing is
shared between reach request
• No Session - i.e. No “HTTPSession” Object
• You cannot do :
• session.setAttribute("user" , user);

• Use HttpSessionListener to count sessions

• ServletFilter , Servlet-related securities

• Instead Play uses (delegates to) memcached as a
workaround


Where is the Session?
Web Browser Play! Framework Server

Application

State Play! Framework Server 2
DB

Application

Crypted signed cookie


Play URLs Are RESTFul


UGLY


UGLY
• http://www.myapp.com/cont/servlet/buyService?
sessionId=3gh3haaa2gg2&action=nextPage&idExpanse
=false&ﬂow=3C&event=s1e1&entityId=23bS&role=p&
date=04%2F12%F2010&returnPage=homeS02&out=tr
ue


UGLY
ue
GRACEFUL


UGLY
ue
GRACEFUL
• http://mysite.com/list/products/page/2


UGLY
ue
GRACEFUL
• http://mysite.com/user/53


UGLY
ue
GRACEFUL
• http://mysite.com/user/53

You can Read it, Bookmark it, Share it and more over SEO
Friendly

Play Request LifeCycle


Play HTTP Request Path


Play Modules


Informative Error Page
No Maven or Ant or Ivy build is required


Tests in the Browser


Documentation & Books


Wait there is more...


• Native Cloud deployment support on
Playapps, Heroku, Google App Engine,
Cloudbees


Cloudbees
• Modules for NoSQL, revert DB, Scaffold,
Excel, Senia, MongoDB, Scalate, PDF,
search, Excel export, etc.


Cloudbees
• Easy to learn


Cloudbees
• Easy to learn
• .............................. and it’s


Cloudbees
• Easy to learn
• .............................. and it’s Java


Cloudbees
• Easy to learn
• .............................. and it’s Java
Give it a Try !

Quick Demo


Q &A


References

• http://www.playframework.org/


Thank You !
for listening


Play

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