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First steps with jWebSocket – open source Java framework for WebSockets – installation and running samples

6
1 year ago
by Lucas Jellema in , ,

This month, In have been delving into Push architectures for the Web, looking into WebSockets among several other things. WebSockets, a fairly new standard (!) evolved along with HTML 5, specifies a communication protocol that provides an alternative to classic HTTP communication. WebSocket based interaction has lower overhead and – more importantly – is bi-directional which means that push from server to client is really supported (and not just emulated through poll, long poll or streaming responses as is currently the case in comet push style frameworks).

All modern browsers provide support for the WebSocket specification – meaning they can communicate based on the WebSocket protocol (ws:// and wss:// in addition to http:// and https://) and they implement the WebSocket client side (JavaScript) APIs. These API are well defined – http://dev.w3.org/html5/websockets/ – and seem to be truly standard across all browsers.

The WebSocket server side is at this moment not very well defined. Other than the fact that the communication over ws:// and wss:// should be handled by a server, not much has been decided about the server side of WebSockets. Currently, WebSockets is not supported in More >

Vacatures bij AMIS services

Push based synchronized Slideshow demo application implemented using CometD and jQuery running on Tomcat

2
1 year ago
by Lucas Jellema in , , ,

In a string of recent articles, I have discussed downloading, installing and running demos for a number of different tools, frameworks and libraries that support push-style (web) applications in one way or another. I have looked into ‘classic’ comet with Grizzly, Atmosphere and CometD as well as ADF Active Data Service and WebLogic Pub/Sub (Bayeux) Channels. I have also looked to WebSockets with jWebSocket, again Atmosphere and CometD and also with Kaazing. I am now working on a series of articles in which I use each of these frameworks and push infrastructures to implement the same simple push-style application – to see how that goes and to compare the various implementations. The functionality I will be implementing is simple:

  • through the web client (HTML 5/javaScript), a user can select an image from a list of ’slides’
  • the selection of the image is communicated to the server (background WebSocket based or alternatively regular AJAX)Comet (Bayeux)/Long Poll style)
  • the server informs all connected clients about the selected image through a pushed message (background WebSocket based or alternatively Comet (Bayeux)/Long Poll style); these clients all synchronize that slide More >
Vacatures bij AMIS services

Get going with Kaazing WebSocket Gateway – HTML5 Edition – installing locally and running demos

2
1 year ago
by Lucas Jellema in , ,

My last few articles on this blog site have all dealt with push architecture and technology in some way. This is an area that I have been investigating into quite bit recently. Part of these investigations had to be of course Kaazing, a specialized commercial offering, specifcally around WebSockets and its application in new HTML 5 application architectures.

Kaazing suggests a new way of implementing multi-tier (web) applications.

Communication between client and back end services happens over WebSockets. The Kaazing Gateway handles all WebSockets communication, turning messages from various back end services based on technologies such RSS, XMPP, JMS into WebSocket events.

Kaazing supports a variety of clients – though HTML 5 (JavaScript) web clients (including those running on mobile devices) are probably the most prominent ones.

(more…)

Vacatures bij AMIS services

Push-based synchronized slideshow web application – implemented using WebSockets and Kaazing WebSocket Gateway

9
1 year ago
by Lucas Jellema in , , ,

In the last few articles, I have discussed downloading, installing and running demos for a number of different tools, frameworks and libraries that support push-style (web) applications in one way or another. I have looked into ‘classic’ comet with Grizzly, Atmosphere and CometD as well as ADF Active Data Service and WebLogic Pub/Sub (Bayeux) Channels. I have also looked to WebSockets with jWebSocket, again Atmosphere and CometD and also with Kaazing. I intend to now take a closer look at some of these frameworks, by taking a simple push-style application and implementing it using each of these frameworks. The functionality I will be implementing is simple:

  • through the web client (HTML 5/javaScript), a user can select an image from a list of ‘slides’

  • the selection of the image is communicated to the server (background WebSocket based or alternatively regular AJAX)Comet (Bayeux)/Long Poll style)
  • the server informs all connected clients about the selected image through a pushed message (background WebSocket based or alternatively Comet (Bayeux)/Long Poll style); these clients all synchronize that slide selection
  • a Java (server side) component can also connect to the More >
Vacatures bij AMIS services

First experiences and getting started with GlassFish 3.1 and NetBeans 7.x – it's a breeze

2
1 year ago
by Lucas Jellema in , , ,

Several years back, AMIS selected GlassFish as its preferred Open Source J(2)EE Application Server, over for example JBoss. Some of the criteria at the time were: speed of implementation of new functionality and integration of JEE (being the reference implementatoin), ease of administration, enterprise quality, small yet rapidly growing market share (the band wagon to hop onto). The fact that now GlassFish is under Oracle’s wings and heavily invested into has further underlined our selection.

During these past few years, I have not had a lot of hands-on experience working with GlassFish. Apart from attending sessions and HOLs (hands-on labs) at JavaOne, reading articles on internet and in general staying updated on the developments around GlassFish, unlike some of my colleagues at AMIS I did not touch the software myself.

Today that changed. I had some time on my hands, an interest in working with WebSocket support in GlassFish and a desire to finally work on the product for myself. This article is a report on my first steps. What I had to do in order to get my first web application running after getting hold of the software and installing the product. It is short and very More >

SIG Event

WebLogic 12c released!

3
1 year ago
by Michel Schildmeijer in , , , , , , , , , , , , , , , ,

At December the 1st, 2011, Oracle announced it’s new major release, the 12c release. As Oracle added the i (internet) at its 8 release, the g(gridcomputing) at its 10 release, now the focus will be on the c(cloudcomputing).

Many new features come out of the fact that Oracle has made its key application server ready for the cloud, that is, ready for to run on enigineered systems, in fact its own Exalogic machine, Oracle’s solution for implementing the cloud.

So let’s take a look what this new release brings us, in this blogpost. There are several new features available in the 12c

New or enhanced WebLogic 12c features
  • JAVA EE 6 support all kinds of JEE6 specifications are implemented like :
    • JSF 2.0,Java Servlets 3.0 JPA 2.0 and EJB 3.1.
    • Managed Beans 1.0
  • WebLogic 12c also supports supports Java SE 7 (and Java SE 6).
    • Java language optimizations and Internationalization
    • Client and server support
    • SSL/TLS 1.2 in JSSE to support JAVA Socket Transport security
    • Converged Java VM:JRockit and HotSpot are  incorporated with the best features from both.The JVM convergence will be a multi-year process, which was confirmed during my presence at Oracle’s Publisher Seminar 2011 during
    More >
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