In this webinar JavaScript is a powerful, flexible, and dynamically typed language. JVM is proven to be reliable and stable production platform. The power of the JVM is an ability to run programs written in different languages, including JavaScript. You can short the development cycle by leveraging a scripting abilities of JavaScript. This presentation is about JVM’s scripting capabilities that allow to mix Java and JavaScript in the same application. In this session you’ll get introduced to the latest state of the polyglot frameworks that use JavaScript and Java side-by-side. We’ll cover these topics: -The JDK8’s Nashorn benefits for the server and the client side developers -Using JavaScript and NodeJS applications and libraries on the Java platform -Real-world projects overview that leveraging on Java-JavaScript interactions -Live Q&A Presenter: Viktor Gamov, Senior Solutions Architect at Hazelcast Viktor joined Hazelcast with over 5 years experience of architecting and building the enterprise applications using open source technologies. At his previous roles, he helped the financial companies and startups with various Java and HTML5 projects. He holds MS in Computer Science. He is a co-author of the O’Reilly book «Enterprise Web Development. From Desktop To Mobile». Viktor presented at various international conferences (http://lanyrd.com/gamussa) on Java and JavaScript related topics. He tweets at @gamussa.

1. www.Hazelcast.com // follow me : twitter.com/gamussa
The Power
of the JVM
Viktor Gamov
Solutions Architect, Hazelcast
Applied Polyglot Projects
with Java and JavaScript

2. “May you live in interesting
times”
Chinese curse

3. Why you’re here
★you're excited about JDK8 features

5. Why you’re here
★you're excited about JDK8 features
★JavaScript enthusiast

7. Why you’re here
★you're excited about JDK8 features
★JavaScript enthusiast
★You need to run JS and Java side-by-side

9. Who is talking?
★Solutions Architect

10. The leading open source in-memory data grid

11. Who is talking?
★Solutions Architect
★co-author and jug co-lead

12. DO you even javascript ?

14. http://enterprisewebbook.com
Available in stores

15. http://enterprisewebbook.com

16. Part one

17. Part one
Javascript
for java developers

18. Not-so-distant pasT
Java devs about javascript
I don’t care

19. MANY good Parts

20. Present
Java devs about javascript
Gotta learn more

21. Everybody knows how to javascript

22. Objects
var obj2 = {prop: 42};
// Store the data about Fox Mulder
var person = {
lastName: "Fox",
firstName: "Mulder",
age: 53
};
var obj = {};

23. // Declaring function
function calcTaxes(income, dependent){
// do stuff
}
Functions
// Invoking function
calcTaxes(5000, 2);
var myTaxes = calcTaxes(5000, 2); // declaration and invocation at the same time
// IIFE - immediate invoked function expression
(function calcTaxes(income, dependent){
// do stuff
})();
// Assigning function literal to a variable
var calcTaxes = function (income, dependent){
// do stuff
};

24. Assigning a Function to
Object Property
person.doTaxes(5000, 2);
person.doTaxes = function (income, dependent) {
// do stuff
};

25. Object Methods in Literals
var person2 = {
lastName: "Fox",
firstName: "Mulder",
age: 53,
doTaxes: function (income, dependent) {
// do stuff
}
};
person2.doTaxes(5000, 2);

26. Constructor function
function Tax(income, dependents) {
// Do something here
}
// Creating 2 Tax objects
var t1 = new Tax(50000, 3);
var t2 = new Tax(68000, 1);

27. prototype
// Constructor function Person
function Person(name, title) {
this.name = name;
this.title = title;
this.subordinates = [];
}
// Constructor function Employee
function FbiAgent(name, title) {
this.name = name;
this.title = title;
}
FbiAgent.prototype = new Person();
var emp = new FbiAgent("Dana Scully", "Special Agent");

28.
print(3[3]);

30. Number.prototype[3] = ”JS Rocks!!!”;
print(3[3]);

31. www.destroyallsoftware.com/talks/wat

32. Part TWO

33. Part TWO
NASHORN: JSR-233 and beyond

34. JAVAScript is everywhere
★v8 and nodejs
★Rhino was here for years
★Here comes nashorn

35. What is Nashorn?

36. Ultimate invokedynamic
consumer
100% pure Java
implementation
100% ECMAScript 5.1
compliant
JavaScript Engine for
JVM
What is Nashorn?
100% compiled to
bytecode,
no interpreter
http://www.1001ausmalbilder.de/ausmalbilder/gross/ausmalbild-nashorn-7.jpg

37. HOW To USE NASHORN?
★ The only API is JSR-223: javax.scripting.*
★ Java from JavaScript and vice versa
★ Create and manipulate Java/JavaScript objects
★ Extend Java classes
★ Implement Java interfaces

38. ScriptEngineManager factory = new ScriptEngineManager();
ScriptEngine engine = factory.getEngineByName("nashorn");
engine.eval("Number.prototype[3] = “JS Rocks!”; print(3[3]);")

39. String[] options =
new String[] {
"--persistent-code-cache",
"--class-cache-size=50",
“—no-java"}; *
NashornScriptEngineFactory factory = new NashornScriptEngineFactory();
NashornScriptEngine engine =
(NashornScriptEngine) factory.getScriptEngine(options);
engine.eval("Number.prototype[3] = ‘JS Rocks'; print(3[3]);");
* jjs -xhelp
http://cr.openjdk.java.net/~sundar/jdk.nashorn.api/8u40/javadoc/jdk/nashorn/api/scripting/NashornScriptEngineFactory.html
https://blogs.oracle.com/nashorn/entry/improving_nashorn_startup_time_using

40. https://wiki.openjdk.java.net/display/Nashorn/Nashorn+extensions
var System = Java.type('java.lang.System');
System.out.println(10); // 10
System.out["println"](11.0); // 11.0
System.out["println(double)"](12); // 12.0
Parameter overloading
var Date = Java.type('java.util.Date');
var date = new Date();
date.year += 1900;
print(date.year); // 2014
Java Beans
print(__FILE__, __LINE__, __DIR__);
Whereis
Load Scripts
//load('http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.6.0/underscore-min.js');
load('./lib/underscore-min.js');
var odds = _.filter([1, 2, 3, 4, 5, 6], function (num) {
return num % 2 == 1;
});
print(odds); // 1, 3, 5

42. SHELL Scripting
Extend app functionality on
runtime
1
2
3
JAVASCRIPT on JVM USE cASES
WEB-content generation4
provide extension points for
application
https://docs.oracle.com/javase/8/docs/technotes/guides/scripting/nashorn/shell.html

43. Part Three

44. Part Three
Java and NODE.JS

45. Node.js

46. ★Use npm to download js dependencies
★use common.js module format
★run under JVM / nashorn
JVM-NPM
https://github.com/nodyn/jvm-npm

47. load('./lib/jvm-npm.js');
var _ = require('underscore');
var odds = _.filter([1, 2, 3, 4, 5, 6], function (num) {
return num % 2 == 1;
});
print(odds); // 1, 3, 5

49. Avatar.js ftw!
https://avatar-js.java.net

50. Take first available express demo from
internet what could go wrong

51. https://github.com/hacksparrow/ninja-store
https://github.com/gAmUssA/avatarjs-express

52. import com.oracle.avatar.js.Server;
import java.io.File;
import java.lang.reflect.Field;
public class Main {
static {
try {
final Field sysPathsField = ClassLoader.class.getDeclaredField("sys_paths");
sysPathsField.setAccessible(true);
sysPathsField.set(null, null);
System.setProperty("java.library.path",
new File(Main.class.getResource("/libavatar-js.dylib").getPath())
.getParentFile().getCanonicalPath());
System.loadLibrary("avatar-js");
} catch (Throwable t) {
throw new RuntimeException(t);
}
}
public static void main(String[] args) throws Throwable {
Server.main(Main.class.getResource("/app.js").getPath());
}
}
credits: https://github.com/danveloper/midwestjs-2014-nashorn/blob/master/node-app/src/main/java/midwestjs/nashorn/Main.java

54. NASHORN in «wild life»
★ Avatar 2.0
★ vert.x
★ nodyn.io

55. Avatar 2.0
★polyglot platform (sort oF)
★integration with nashorn
★Node api
★Model-Store api
★Event bus
★Distributed data
★not open yet

56. Avatar 2.0
https://blogs.oracle.com/theaquarium/entry/project_avatar_update
R.I.P 2013 -2015

57. ★polyglot platform
★Develop with Java, Javascript, jRuby, Groovy, jython, clojure,
★Scala, php, ceylon
★integration with nashorn
★https://github.com/vert-x/mod-lang-nashorn
★Event bus (down to the browser)
★Distributed data (in v.3)
★Open source: EPL / Apache
vertx.io

58. ★NODE api for Java platform
★USES DYNJS - ALTERNATIVE JAVASCRIPT ENGINE
★INTEGRATED WITH VERTX
nodyn
http://nodyn.io/

59. p.s. Node ❤ Java

61. Demo

62. Q&A

63. SHOW ME THE CODE
https://github.com/gAmUssA/java-scripting-experiments
https://github.com/gAmUssA/hazelcast-nashorn
https://github.com/gAmUssA/hazelcast-nodejs
https://github.com/gAmUssA/avatarjs-express

64. THANKSFOR YOUR ATTENTION
www.hazelcast.com // follow me : twitter.com/gamussa