Author: Lucas Jellema

The objective discussed in this article is to post messages to a CometD Bayeux Channel with a standalone Java Class – without dependencies on CometD. For example to control …

In recent articles, I have introduced CometD as framework for Server to Client and Client to Client Push: Running CometD 2 examples – locally on Tomcat using Maven and …

Session state in Java Web application is associated with a single (user) browser session on the one hand and typically with a specific web application on the other (server …

EL expressions are one of the main driving forces for JavaServer Faces. Most dynamic characteristics of pages and widgets are governed by EL expressions. In JSF 1.x, there are …

Last year I wrote about JSoup, a Java library that helps with screenscraping: Screenscraping from Java using jsoup – effective data gathering from websites (https://technology.amis.nl/blog/13121/screenscraping-from-java-using-jsoup-effective-data-gathering-from-websites). Last month I had …

In a previous article, I have discussed the open source jWebSocket Server and a simple installation and configuration (https://technology.amis.nl/blog/14940/first-steps-with-jwebsocket-open-source-java-framework-for-websockets-installation-and-running-samples). Subsequently, I have shown the implementation of a web client …

In a previous post – https://technology.amis.nl/blog/14949/push-based-synchronized-slideshow-web-application-implemented-using-websockets-and-jwebsocket-server-the-open-source-java-websocket-server – I discussed the implementation of the synchronized slideshow application using Web (HTML/JavaScript) clients and jWebSocket as websocket server. In an earlier article, …

In a recent article, I have introduced jWebSocket – an open source Java based server for WebSocket communication: https://technology.amis.nl/blog/14940/first-steps-with-jwebsocket-open-source-java-framework-for-websockets-installation-and-running-samples. In this article, I have described how to download and …

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 …

While preparing for the next session in our internal SOA for Java Professionals training program on BPEL, I revisited the BPEL activity Java Embedding that allows us to enrich …

BPEL 2.0 introduced the forEach activity – similar to for found in many programming languages. Oracle SOA Suite 11g adopted BPEL 2.0, first in run time (PS2) and later …

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 …

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 …

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 …

NetBeans 7.1 has just been released. It is interesting how NetBeans continues to evolve – after many doubts were raised with regard to its future after the Oracle-Sun acquisition. …

Over the past weeks, I have been dabbling in Comet style, push-based, asynchronous communication enabling frameworks and libraries – including CometD, Atmosphere, Kaazing, jWebSocket, Grizzly and others. This short …

On the heels of previous articles that described setting up NetBeans (https://technology.amis.nl/blog/14661/first-experiences-and-getting-started-with-glassfish-3-1-and-netbeans-7-x-its-a-breeze), Tomcat 7 (https://technology.amis.nl/blog/14688/installing-tomcat-7-and-configuring-as-server-in-netbeans) and the CometD 2 environment (https://technology.amis.nl/blog/14709/running-cometd-2-examples-locally-on-tomcat-using-maven-and-netbeans), this article describes how I opened the Java …

Push technologies is an area of interest to me. I have been looking into frameworks, servers and libraries such as Atmosphere, ADF ADS, CometD 2, Kaazing, jWebSockets, Grizzly and …

Tomcat 7 is a Servlet Container – a fairly light weight container, very convenient for development and testing. While not a full application server, Tomcat implements the functionality described …

In my investigations into jWebWSockets, Kaazing, Atmosphere, CometD 2 and other frameworks I came to understand that in order to get these frameworks installed, integrate them into my custom …

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 …

I regularly teach a masterclass on Oracle SQL. One of the topics I explore in depth is the use of the CONNECT BY query style to perform not just …

The functional requirement was a little unusual. The page should either show all master-records or – depending on the value of a parameter – it should show exactly one …

This presentation will hopefully convince database developers that types in the Oracle Database are worth their salt – and more. With the recent improvements in 11gR2, the pieces are …

Slides for the presentation I did with Grant Ronald during UKOUG 2011, last week in Birmingham. The abstract for this presentation: “Many organizations run enterprise Oracle Forms applications created …

Sometimes apparently complex things turn out to be very simple to achieve using ADF. And occasionally it is the other way round: things that seem to simple that you …

Working on a WebCenter 11g Portal application, I recently ran into a challenge: when the user clicks a link in a task flow, the result of that action should …

This article accompanies an article on the Architecture section of Oracle Technology Network (OTN): Implementing the Enterprise Service Bus Pattern to Expose Database Backed Services. It provides a detailed …

The situation: in an ADF Faces 11g page, we have a popup with two buttons: one to start a download and one to cancel the popup. When the users …

The functional requirement for my ADF application was fairly simple: the values used for the bind parameters in one ViewObject should be reflected for a second ViewObject. In more …

On the one hand: the organization wants to publish a real Web Service, SOAP enabled and all. On the other: the data to be provided by this Web Service …

A few months back, in August, I received an electronic copy of the book: “Oracle WebCenter 11g PS3 Administration Cookbook” by Yannick Ongena (Packt Publishing, 2011). I promised you …

Below is my presentation from the OGH DBA, SOA & BPM Day on November 8th. My talk was about achieving instant agility with application, through the ability to manipulate …

An interesting discussion arose in one of the projects I am involved in. The functional requirement at stake: show records in a table. In one of the columns, show …

A quick note on the notion of valves and pipelines that can be configured in File (and FTP) Adapter Services and References (inbound and outbound) to perform file pre- …

While working on the challenge to publish a message to a JMS Queue in a remote WebLogic Server from within the Oracle Database – using a Java Stored Procedure …

Recently I received an email from Peru. An ADF developer from Peru was facing a challenge with ADF. In short: ‘the upload of a (large) file should be followed …

Hier vind je twee uitgebreide artikelen met een verslag van Oracle Open World 2011 en van JavaOne 2011. Ook vind je in deze blog-post de slides van de ‘Report …

Aanstaande vrijdag geef ik voor de derde keer de Masterclass Advanced Oracle SQL. Deze MC gaat over SQL – dat zal duidelijk zijn. We gaan de mogelijkheden van SQL …

Het zal je niet zijn ontgaan dat vorige week in San Francisco Oracle Open World woedde. In een krappe week legde Oracle voor zo’n 45.000 bezoekers de strategie neer, …