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Play Framework: Intro & High-Level Overview
This document provides an introduction to the Play Framework for Java web application development. It discusses the challenges of traditional Java web development, including long redeploy times, complex XML configurations, and impedance mismatch between HTTP and Java EE. It then introduces the concepts of reactive and modern web development. The document outlines the goals of the Play Framework to improve both performance and productivity. Key aspects of the Play Framework are discussed, including its focus on developer productivity, built-in support for RESTful APIs, and stateless and scalable architecture. The presentation concludes with a live coding demonstration of basic Play Framework features.
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Play Framework: Intro & High-Level Overview
- 1. Intro to PlayFramework & Modern Java Web App Development Josh Padnick Desert Code Camp 2013.2 November 9, 2013
- 2. Today’sTalk • Java WebApp DevelopmentToday • Modern Web App Development • Meet Play Framework • Build Stuff!
- 3. • 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
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- 5. Java Web App DevelopmentToday Challenges
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- 7. Lots ofTime Waitingfor 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
- 8. Long, Ugly ErrorMessages 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://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
- 9. ?xml version=1.0 encoding=UTF-8? web-appversion=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 http://www.youtube.com/watch?v=8z3h4Uv9YbE
- 10. Bean Failures org.omg.CORBA.OBJECT_NOT_EXIST SOURCE FORGRAPHIC: Beginning Java EE 6 Platform with Glassfish 3 by Antonio Goncalves, Page 5. X
- 11. Clunky Road to RESTfulURLs 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 } }
- 12. A Lot ofComplexity!
- 13. I just wantto write working software!
- 14. Is this thearchitecture we would create today?
- 15. The root ofthe problem Impedance Mismatch between HTTP and Java EE!
- 16. RESTful URLs vs.Java Servlets Spec Impedance Mismatch
- 17. 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
- 18. Impedance Mismatch Code Refresh vs. WAR Deployment
- 19. Modern Web AppDevelopment
- 20. Buzzwords! • HTML5 Javascript • MVVM Frameworks • Mobile • NoSQL • Real-Time • Big Data • Asynchronous • Immutability • Connected Devices
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- 22. The Reactive Manifesto “Applicationrequirements 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
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- 25. Goal: Performance +Productivity Performance Productivity SOURCE: http://typesafe.com/blog/webinar-a-java-developers-primer-to-the-typesafe-platform
- 26. No More JEEContainer SOURCE: Play for Java by Nicolas Leroux and Sietse de Kaper
- 27. Focused on DeveloperProductivity • Live code changes when you refresh the browser • More friendly error messages directly in browser • Type safety in the templates • Cool console build tools
- 28. Designed for theModern Web • RESTful by default • Auto-compile LESS and CoffeeScript files • JSON is a first-class citizen • Websockets, other HTTP Streaming Support
- 29. Stateless and Builtfor Scale • Forces every aspect of your app to be stateless • Non-Blocking I/O • Well-suited for real-time
- 30. What exactly isit, though? SOURCE: Play for Java by Nicolas Leroux and Sietse de Kaper
- 31. What exactly isit, 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…
- 32. Of course, nothing’sperfect 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
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- 34. Intro Stuff 1. Downloadand install 2. Play Console 3. Controllers 4. URL Routing 5. Templates
- 35. Intro Stuff 1. Downloadand install 2. Play Console 3. Controllers 4. URL Routing 5. Templates
- 36. Intro Stuff 1. Downloadand install 2. Play Console 3. Controllers 4. URL Routing 5. Templates
- 37. Intro Stuff 1. Downloadand install 2. Play Console 3. Controllers 4. URL Routing 5. Templates
- 38. Intro Stuff 1. Downloadand install 2. Play Console 3. Controllers 4. URL Routing 5. Templates
- 39. Intro Stuff 1. Downloadand install 2. Play Console 3. Controllers 4. URL Routing 5. Templates
- 40. Let’s Build Something intheTime Remaining
- 41. So what didyou like best today? • We’ll take some votes and show the results real-time
- 42. 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
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