Nashorn: JavaScript Running on Java VM (English)

JavaScript Running On JavaVM: Nashorn

NISHIKAWA, Akihiro

Oracle Corporation Japan

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Agenda Nashorn

Server Side JavaScript

Nashorn in the future

Nashorn

NashornJavaScript Engine running on Java VM

Backgrounds

Replacing Rhino

– Concerns about security, performance, and so on

Proof of Concept for InvokeDynamic (JSR-292)

Atwood's law

Any application that can be written in JavaScript will

eventually be written in JavaScript.

Scope of Project NashornJEP 174

ECMAScript-262 Edition 5.1 compliant

Support for javax.script (JSR 223) API

Interaction between Java and JavaScript

Newly introduced command line tool (jjs)

Java VM

Scripting Engine

(Nashorn)

Scripting API

(JSR-223)

JavaScript codeJava code

Other runtime

Other APIs jjs

$JAVA_HOME/bin/jjs

$JAVA_HOME/jre/lib/ext/nashorn.jar

ECMAScript-262 Edition 5.1 compliant

Out of scope of Project Nashorn

ECMAScript 6 (Harmony)

– Generators

– Destructuring assignment

– const, let, ...

DOM/CSS and related libraries

– jQuery, Prototype, Dojo, …

Browser API and browser emulator

– HTML5 canvas, HTML5 audio, WebGL, WebWorkers...

Examples

Invoke Nashorn from Java

ScriptEngineManager manager= new ScriptEngineManager();

ScriptEngine engine= manager.getEngineByName("nashorn");

engine.eval("print('hello world')");

engine.eval(new FileReader("hello.js"));

Invoke Nashorn from JavaInvoke script function from Java

engine.eval("function hello(name) {print('Hello, ' + name)}");

Invocable inv=(Invocable)engine;

Object obj=inv.invokeFunction("hello","Taro");

Invoke Nashorn from JavaImplement an interface with script function

engine.eval("function run(){

print('run() called’)

Invocable inv =(Invocable)engine;

Runnable r=inv.getInterface(Runnable.class);

Thread th=new Threads(r);

th.start();

th.join();

Invoke Java/JavaFX from Nashorn

print(java.lang.System.currentTimeMillis());

jjs -fx ...

Nashorn for ScriptingAdditional feature for scripting use

-scripting option

Here document

Back quote

String Interpolation

Nashorn Extensions

Nashorn ExtensionsThe following topics are covered in this session.

How to get references of Java type

How to access properties of Java objects

Relationship among Lambda, SAM, and Script function

Scope and context

Java type

How to get references of Java typeExpression in Rhino (This expression is valid in Nashorn)

var hashmap=new java.util.HashMap();

var HashMap=java.util.HashMap;var hashmap=new HashMap();

How to get references of Java typeRecommended expression in Nashorn

var HashMap=Java.type('java.util.HashMap');var hashmap=new HashMap();

Java.typeClass or Package?

java.util.ArrayList

java.util.Arraylist

Java ArrayExpression in Rhino

var intArray=java.lang.reflect.Array.newInstance(

java.lang.Integer.TYPE, 5);

var Array=java.lang.reflect.Array;

var intClass=java.lang.Integer.TYPE;

var array=Array.newInstance(intClass, 5);

Java ArrayExpression in Nashorn

var intArray=new(Java.type("int[]"))(5);

var intArrayType=Java.type("int[]");var intArray=new intArrayType(5);

Access properties ofJava objects

Using getter and setter

var HashMap=Java.type('java.util.HashMap');

var map=new HashMap();

map.put('size', 2);

print(map.get('size')); // 2

Directly

map.size=3;

print(map.size); // 3

print(map.size()); // 1

Using Associative Array

map['size']=4;

print(map['size']); // 4

print(map['size']()); // 1

Lambda, SAM, and Script function

Lambda, SAM, and Script functionNashorn converts a script function to a lambda object or any SAM

interface implementing object automatically.

var timer=new java.util.Timer();

timer.schedule(

function() { print('Tick') }, 0, 1000);

java.lang.Thread.sleep(5000);

timer.cancel();

Lambda, SAM, and Script functionAny Java object which is an instance of lambda type can be treated like a

script function.

var JFunction=Java.type('java.util.function.Function');

var obj=new JFunction() {

// x->print(x*x)

apply: function(x) { print(x*x) }

print(typeof obj); //function

obj(9); // 81 like Script function

Scope and Context

Scope and Contextload and loadWithNewGlobal

– Load scripts in the same global scope.

– If same name variables are in the original scripts and

loaded scripts, Corruption of each variable may happen.

loadWithNewGlobal

– Load scripts in another global scope newly created.

– Even if same name variables are in the original scripts

and loaded scripts, Corruption of each variable may not

happen.

Scope and ContextScriptContext contains one or more Bindings each associated each jsr223

"scope".ScriptContext ctx=new SimpleScriptContext();

ctx.setBindings(engine.createBindings(),ScriptContext.ENGINE_SCOPE);

Bindings engineScope=ctx.getBindings(ScriptContext.ENGINE_SCOPE);

engineScope.put("x", "world");

engine.eval("print(x)", ctx);

Scope and ContextUsing with clause and JavaImporter

with(new JavaImporter(java.util, java.io)){

var map=new HashMap(); //java.util.HashMap

map.put("js", "javascript");

map.put("java", "java");

print(map);

Others

Convert between Java array and JavaScript array

– Java.from

– Java.to

Extend Java class and access super-class

– Java.extend

– Java.super

and so on...

Java EE for Next Generation ApplicationsDeliver HTML5, Dynamic and Scalable Applications

Evolution of Web application architectureRequest-Response and Multi-page application

Java EE/JVM

Presentation

(Servlet/JSP)

Business

Backend

ConnectivityBrowser

Evolution of Web application architectureUse Ajax (JavaScript)

Java EE/JVM

Connectivity(REST, SSE)

Presentation(Servlet/JSP, JSF)

Business

Backend

ConnectivityBrowser

JavaScript

Modern Web application architectureRather connectivity than Presentation – Single Page Application

Java EE/JVM

Connectivity(WebSocket,

REST, SSE)

Presentation(Servlet/JSP, JSF)

Business

Backend

ConnectivityBrowser

Controller

JavaScript

How about Node.js?

Mobile-enabled existing services with Node.js

Node.js

JavaScript

WebSocket

Browser

Controller

JavaScript

How aboutNode.js on JVM?

Mobile-enabled existing services with NodeNode running on Java VM

Java EE/JVM

Server

Business

Backend

Connectivity

Client

JavaScriptBrowser

Controller

JavaScript

Avatar.js

Avatar.jsOld name is "node.jar"

Able to use almost all of modules available on Node.js

– Express, async, socket.io, ...

Some modules are required to modify.

– Automatically recognize modules downloaded with

– Leverage node programming model

– Leverage existing Java assets, knowledge, and tools

Avatar.js = Node + JavaLeverage Java technologies including Threads

JavaJavaScript

com.myOrg.myObj

java.util.SortedSet

java.lang.Thread

require('async')

postEvent

Node App

Avatar

AvatarServer side JavaScript services framework

Provide data transmission features via REST, WebSocket,

and Server Sent Event (SSE)

Leverage event-driven programming model and

programming modules of Node.js

Integrate with Enterprise Features (Java EE)

*.html

Application

Services

Avatar Modules

Node Modules

Avatar.js

Avatar Runtime

Avatar Compiler

Server Runtime (Java EE)

JDK 8 / Nashorn

Application

REST/WebSocket/SSE

Avatar (Avatar EE)

Change

Notification

REST/WebSocket/SSE

Avatar Compiler

Application

*.html

Application

Services

Avatar Modules

Node Modules

Avatar.js

Avatar Runtime

JDK 8 / Nashorn

Architecture (Server Side)

Change

Notification

Avatar Service

HTTP Load Balancer

Services

Shared State

Services Services

Change

Notification

Avatar Runtime

Avatar Modules

Node Modules

Avatar.js

*.html

Application

Services

JDK 8 / Nashorn

Architecture (Client Side)

Change

Notification

REST/WebSocket/SSE

Application

Avatar Compiler

Avatar and Avatar.jsprogress steadily.

Bytecode Persistence (JEP 194)

http://openjdk.java.net/jeps/194

Optimistic Typing

Others

Summary

Key takeaways

Nashorn

– Tightly integrated with Java

– Pay attention to different expression when migrating

artifacts from Rhino to Nashorn

– Progress steadily (performance improvement, new

features, compliant against new standards)

– Avatar.js and Avatar are on-going.

– Please feedback!

Appendix

Source code walk through

Shell jjs uses mainly.

Compiler generates classes (bytecode) from sources.

Scanner Create tokens from sources.

Parser Create AST/IR from tokens.

IR Elements of scripts

Codegen Create script class bytecode from AST/IR

Objects Runtime elements (Object, String, Number, Date, RegExp)

Scripts Classes including codes for scripts

Runtime Runtime tasks

Linker Binds callees on runtime based on JSR-292 (InvokeDynamic)

Dynalink Searching for best methods (available across languages)

Nashorn Documentshttp://wiki.openjdk.java.net/display/Nashorn/Nashorn+Documentation

Java Platform, Standard Edition Nashorn User's Guide

http://docs.oracle.com/javase/8/docs/technotes/guides/scripting/nash

Scripting for the Java Platform

http://docs.oracle.com/javase/8/docs/technotes/guides/scripting/

Oracle Java Platform, Standard Edition Java Scripting Programmer's

http://docs.oracle.com/javase/8/docs/technotes/guides/scripting/prog_

guide/

Nashornhttp://openjdk.java.net/projects/nashorn/

OpenJDK wiki – Nashorn

https://wiki.openjdk.java.net/display/Nashorn/Main

Mailing List

nashorn-dev@openjdk.java.net

– Nashorn - JavaScript for the JVM

http://blogs.oracle.com/nashorn/

– Nashorn Japan

https://blogs.oracle.com/nashorn_ja/

Avatar.js

Project Page

https://avatar-js.java.net/

Mailing List

users@avatar-js.java.net

Avatar

Project Page

https://avatar.java.net/

Mailing List

users@avatar.java.net

Nashorn: JavaScript Running on Java VM (English)

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Transcript of Nashorn: JavaScript Running on Java VM (English)

Nashorn : JavaScript Running on Java VM (Japanese)

Nashorn: JavaScript for the JVM CON1888 Jim Laskey Senior Development Manager Java Language and Tools September 29, 2014 Copyright © 2014, Oracle and/or.

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