Tug’s Blog

My journey in Big Data, Hadoop, NoSQL and MapR

Windows User Finally You Will Be Able to Use Konfabulator

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One of my favorites tools on my Mac is Konfabulator that allows you to create -or use prebuilt- application called Widgets. This Widgets are for example battery level, weather, see the Widget Gallery.

The reason why I love it is not necessary the list of existing one, but more because you can very easily develop yours using Javascript. Dowload it and start to develop your widgets, developer guide, javascript reference are available in the Konfabulator Workshop

HTML/Javascript Tip: Refreshing an Image Not the Full Page

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I was discussing with a friend about the creation of a monitoring dashboard in HTML. As any monitoring tool you want to be able to see the information in real-time, so you need to refresh the content….

One way of doing it is to refresh the whole page and this is easy, just use the meta tag: <META HTTP-EQUIV="Refresh" CONTENT="5; URL=http://www.grallandco.com/" > where 5 is the number of seconds between each refresh.

Javascript allows you to easily refresh a specific image of your page (a chart for example):

<img src="myChartServlet" name="chart1"/>
<script language="JavaScript">
  function loadImage() {
    var now = new Date();
    if (document.images) {
      document.images.chart1.src = 'myChartServlet?time='+now.getTime(); // add the time to avoid caching

You can obviously make the whole think dynamic and configurable…

Mike Keith About Java2 5.0 Annotations

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Mike Keith,architect for Oracle Containers for J2EE (OC4J) and TopLink products and currently represents Oracle in the EJB 3.0 expert group, has published an interesting article about Annotations in Java 5.0:.

To Annotate or Not? focused on the usage of Annotation or XML as metadata language. Mike provides sample code and explain the pros and cons of the annotation using use cases.

New Dynamic Menu for OracleAS Portal 10g

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Ronaldo Viscuso has just released a new version of his DHTML Menu Portlet. This portlet generates a DHTML menu for site navigation, with links to pages and subpages from a selected page group.

Stylesheet, height, width, mouse-over behavior, etc. are all configurable via the “Edit Defaults” page, which allows for complete customization for pretty much any desired look & feel….

The portlet, screen shots and installation document are available on the Portal Knowledge Exchange.