• JavaScript service layer for Java EE
• REST, WebSockets & Server-Sent Events
• based on Nashorn, Avatar.js, Jersey, Grizzly, etc.
•  
• Rich HTML5 client side framework
• Assumes very minor JavaScript knowledge
• Thin Server Architecture (TSA)
•  
• https://avatar.java.net

• JavaScript Enginge on the JVM (native)
• competes with Google V8
• ECMAScript 5.1 compatible (ECMAScript 6 in future)
• Seamless integration of Java and JavaScript
• Language and API Extensions
  closures, collections & for each, multi-line string literals, string interpolation, __noSuchProperty__, __noSuchMethod__, typed arrays, binding properties, error extensions, conditional catch clause, String functions, and many, many more...
•  
• https://blogs.oracle.com/nashorn/

static String sayHello(String name) {
    return String.format("Hello %s from Java!", name);
}

 var avatar = require('org/glassfish/avatar');

var itemsFileProvider = new avatar.FileDataProvider({
  filename: 'rest-sample.txt'
  key: 'key'
});

var itemsJpaProvider = new avatar.JPADataProvider({
  persistenceUnit: 'rest',
  createTables: true,
  entityType: 'Item'
});

myDataProvider.create(item, callback);
myDataProvider.del(item, callback);
myDataProvider.get(key, callback);
myDataProvider.getCollection(parameters, count, offset, callback);
myDataProvider.put(key, item, callback);

myDataProvider.create(item).then(...);

var myJMS = new avatar.JMS({
    connectionFactoryName: 'jms/myConnFactory',
    destinationName: 'jms/myQueue'
});

myJMS.addListener(function(message) {
    avatar.log('Got message: ' + message);
}).then(function() {
    avatar.log('Sending message...');
    return myJMS.send('Test message');
}).then(function() {
    avatar.log('Message sent.');
});

avatar.registerRestService({url: 'data/items/{item}', methods: ['GET']},
    function() {
        this.onGet = function(request, response) {
            myDataProvider.get(this.item)
               .then(response.send(itemValue));
        };
    }
);

avatar.registerPushService({url: 'push/stocks'},
    function() {
        this.onOpen = function(context){
            context.setTimeout(5000);
        };

        this.onTimeout = function(context) {
            context.sendMessage('HelloWorld!');
        };
    }
);

avatar.registerSocketService({url: '/websocket/chat'},
    function() {
        this.onMessage = function(peer, message){
            peer.getContext().sendAll(message);
        };
    }
);

var bus = avatar.application.bus;