JAVA EVERYWHERE AGAIN—WITH DUKESCRIPT For a long time, Java was perfect for creating cross-platform applications, but the advent of iPhone, iPad, and Android devices changed everything, resulting in a totally fragmented world. Catering to all these platform is troublesome and expensive. That’s why DukeScript was created: to make it easy to create cross-platform Java applications again. The goal of this hands-on lab is to create a cross-platform application from scratch that will run on iOS, Android, desktop, browser, and embedded devices such as the Raspberry Pi. You’ll learn about the Model-View-ViewModel (MVVM) architecture, which enables you to write and test business code totally independently of the view, and, finally, you’ll see it combined with a view to complete a working application. IMPORTANT Before conference, please follow the steps to prepare for the session: - perform the Maven repository initialization by creating the archetype and building it as described at DukeScript website - also download NetBeans IDE (either latest beta or at least 8.0.2) - Installing Android SDK rev. 19 or bringing own Mac Book with XCode installed can be also found beneficial

1. Java Everywhere Again
With DukeScript http://www.dukescript.com
@DukeScript

2. Program Agenda
1st Cool Demo
Intro & Overview
2nd Cool Demo
Discussion
And so on...
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2
3
4
5
2

3. Demo
3
Write Once and Display Anywhere!

4. GUI of Yesterday and Tomorrow
• Desktop applications (NetBeans Platform, Eclipse RCP)
– Not cool anymore
• Web applications (servlet, JSP, JSF, etc.)
– A bit too static
• Mobile applications
– Android is synonym for client side Java
• HTML5 applications
– HTML/CSS and JavaScript in the browser
– What should run on the server?
• Where is WORA?
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5. The Battle Rages On
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6. HTML5/CSS
• Most portable UI toolkit of today
– Any device with screen can render it
• 25-years of intensive use
– Robust, flexible
– A bit bloated
• Great tooling
– For UX designers
– Import/export assets
• Requires JavaScript!?
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7. Designer vs. Developer
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Infographic by: Shane Snow. Shane Snow is an entrepreneur, writer, and recent Columbia MS/Digital Media graduate. Visit his personal site and follow him on Twitter @shanesnow.

8. The JavaScript Problem
• Assembly language of today
– Like Z80, i8088 – cool programming “language” in 80-ties
• Runs everywhere
– Immediate availability in a browser
– Favorite target for other languages
• “WONTA”
– Write once and never touch again
• Tooling impossible
– Automatic refactorings in JavaScript!?
8

9. The Java Situation
• WORA - Java vision in 1995
– Client side & embedded technology vs. ended up on servers
• Eating up gigabytes of memory => worse than JavaScript?
• Java browser plugins (to be) banned
• Java tooling is great
– Twenty years of heavy industrial usage
– Reliable code-completion, refactorings
– Enormous amount of libraries
– A bit verbose
• One language to rule them all
– Same language on server and client. Can Java do it?
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10. HTML5/CSS with Java (without JavaScript)
10

11. Duke's Choice
Award 2014 goes
to DukeScript
11

12. “DukeScript is the Lightweight
JavaFX I always dreamed of!”
– Stephen Chin, JavaOne M.C.
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13. Demo
13
Anatomy of DukeScript Sample

14. Knockout.js
• Among four most popular JavaScript frameworks
• MVVC
– Don't touch your UI! Let it update itself!
●
Developers code. Designers play with CSS and HTML.
– Completely testable
●
Forget selenium! Unit testable!
• Revolutionary HTML/Java API
– More effective than plain JavaScript
●
Heavy use of annotation processors
– Initially may feel slightly upside down
14

15. Effective Java API
• Eliminate getters and setters
– Describe just properties
– Generate the class via annotation processors
– 100% Java compatible
• Java to “JSON” bindings
– Convert Java models to JSON
– Expose SPI to bind to knockout.js & others
• Effective client/server JSON communication
– REST & JSON – more effective than in JavaScript
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16. Knockout 4 Java Bindings Architecture
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17. Demo: Knockout 4 Java
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Coding & Testing for KO4J

18. DukeScript's Highlights
• HTML/Java APIs
– Smooth integration of Java and HTML5
– NetBeans subproject
– Integrate any JavaScript library
• Java on any client
– Back to roots
– Excellent tooling
– Need runtime for iOS, Android, browsers
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19. Android & Java
• Dalvik VM
– Java language, different bytecode
– Subset of Java libraries
– Synonym for Java on client
• Specific UI
– WebView component
●
Asynchronous JavaScript execution
– Bridge Java / browser calls
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20. No Java on iOS!?
• “Apple bans Java on iOS”
– Not true. Bans dynamic code generation.
– Link everything statically!
• RoboVM
– Compiles to LLVM like Objective-C
– Uses Android non-GUI libs
●
Guarantees good compatibility
• Re-exposes Apple iOS APIs
– WebView
●
synchronous JavaScript execution
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21. No Java in Browsers
• Firefox & Chrome ban Java
– Claiming plugins == security holes
– Push towards JavaScript or Dart or asm.js, etc.
• Bck2Brwsr VM
– AOT and JIT to JavaScript – no plugins needed!
– Optimized for V8
– Naturally displays HTML
– Subset of OpenJDK libraries
• Plus Tea VM, Doppio...
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22. Demo: Tooling
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Create, debug and deploy anywhere!

23. Integrate any library
• Call JavaScript from Java
– Annotate a method with @JavaScriptBody annotation
– Write its implementation in JavaScript
– Synchronous & asynchronous callbacks
• Call Java from JavaScript
– Identify method with a FQN and type signature
●
r.@java.lang.Runnable::run()()
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@java.lang.String::valueOf(I)(10)
– Synchronous callbacks
• Builds on long time existing industry standard
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24. Demo: Integrate a JS Library
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Integration of 2D canvas

25. REST and WebSockets and JSON
• Pluggable SPI for parsing JSON
– Browser implementation or org.json library
• REST calls @OnReceive annotation
– Generates boilerplate code
●
Method to initialize the call and asynchronously get result
– Browser's XMLHttpResource
– URLConnection and JSON parser
– Integration with Jersey – same code on client and server
• Web Sockets via @OnReceive annotation
– Native browser or Glassfish's Tyrus implementation
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26. Demo: REST
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CRUD Demo Communication

27. Type-safe JSON API
• Everyone wants to create own JSON API
– org.json, javax.json, even JDK!
– Type safety => verbose and reflection
• Use @Model annotation for manual JSON parsing
– Type-safe
– Reflection-less
• Set proper environment
– Use knockout4j archetype, remove ko4j
– Add ko-tyrus-ws
●
Includes Java based JSON parser
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28. Demo: Type-safe JSON Parsing
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Parse JSON manually

29. Debugging JavaScript/Java apps
• Is anything wrong in your @JavaScriptBody?
– Write a unit test
– Debug it in NetBeans
– Simulate browser environment
• Avatar.js
– Node APIs on top of JVM
– Debug it in NetBeans
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30. Demo: Debugging Mixed Apps
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Java and JavaScript on the Stack

31. Controls.js
Technology for building (web and mobile) applications.
Jiří Tulach
tulach@position.cz
http://controlsjs.com

32. Position s.r.o. (Ltd.) - Creator of Controls.js
• History
– Founded in 2000
– Applications and services focused on electronic maps
– SaaS web application provider since 2005
– Controls.js technology since 2008 (made public in 2014)
• Customers
– Vodafone, T-Mobile, Telefónica O2, ČEZ Group, ...
• Partners
– HERE (formerly known as NAVTEQ and NOKIA Location & Commerce)
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33. Why Controls.js?
• Standard web application development
– Switching between HTML, CSS and JavaScript
– Code sharing?
– Dealing with cross-browser incompatibilities
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34. Why Controls.js?
• Standard web application development
– Switching between HTML, CSS and JavaScript
– Code sharing?
– Dealing with cross-browser incompatibilities
• Controls.js application development
– JavaScript only (No HTML, CSS needed only when creating Skins)
– Component based (No DOM)
●
create new components based on existing ones
– Cross-browser
●
IE6+, FF 2+, Opera 9.26+, Chrome, Safari
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35. But Controls.js can do more...
• Touch support
– Supports gestures, unifies touch and mouse events
• Multi-device development
– GUI adjustments and JavaScript loading based on detected device
type
– Optimized for Apache Cordova/PhoneGap
• Localization
– Resource strings, GUI adjustments
• Model-View-ViewModel (MVVM)
– Knockout.js bindings
– ViewModel's typed properties handles parsing, formatting and
validation
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36. ...a lot more
• Application state handling
• Server communication
- GET/POST Request/Data/JSON, Script, IFRAME, Auto
• Asynchronous script loader
• Support for CSS sprite images
• Functions for objects duplication and merging
• Functions for URL escaping and HTML encoding/decoding
• etc.
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37. 37
var AppForm = null;
function ngMain()
{
AppForm = new ngControls({
Edit1: {
Type: 'weEdit',
L: 20, T: 20, W: 200,
Data: {
Text: 'Hello, world!'
}
}
});
AppForm.Update();
}
Hello World

38. Usable controls
• More than 100 visual and non-visual controls
– Buttons, Edit Boxes, Labels, Panels, Lists, Windows, Menus, …
– 3 different Skins
• Easy creation of new controls
– Create new controls based on existing ones
– Define only new visual styles (new skins)
– In application ad-hoc controls
– Encapsulate 3rd
party components (CodeMirror, amCharts)
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39. Usable controls (partial sample)
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40. Usable controls (partial sample)
40

41. Usable controls (partial sample)
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Chart controls are
using
3rd
party library
amCharts
http://www.amcharts.c
om

42. Controls.js Tools – Form Editor
• WYSIWIG editor
• Controls.js application
• Instant updates
code ↔ preview ↔ properties
• Beta version available
http://formeditor.controlsjs.com
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43. Controls.js Tools – Skin Editor
• CSS sprite definition
• Controls.js application
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44. Application for Slovak Telekom – Desktop
version
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45. Mobile version – Mobile web / Apache Cordova
application
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Shares more than 90% of code with desktop
version.

46. Controls.js 4 Java
• Controls4j Package
– Integration based on Knockout.js (MVVM)
– Goal is to minimize usage of JavaScript
– Glues GUI defined in .ng files with DukeScript @Model classes
• NetBeans Controls.js 4 Java plug-in
– Integrates Controls.js Form Editor into NetBeans (associated
with .ng files)
46

47. Demo: Controls.js 4 Java
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Building Controls.js Java Application

48. 48
Questions?
Controls.js 4 Java:
GUI for DukeScript
DukeScript:
Write Once, Display Anywhere!