Eclipse RCP Editors

I kept getting the following exception when trying to open an editor part using Eclipse RCP:

PartInitException: Unable to open editor, unknown editor ID: my.editor.id

The message was a lie -- I had registered an editor under the stipulated ID.  But when I debugged into Eclipse code, I could see that my editor had not been registered.  Investigating further, I found the following message in the application log:

!MESSAGE Plugin my.plugin, extension org.eclipse.ui.editors
Required attribute 'icon' not defined

It appears that the 'icon' attribute is required, even though it is not shown as such in the plug-in manifest editor.  Note that the condition is reported as a 'message' and not an 'error', so if you don't go looking into the application log, you won't see it.

Javascript Clock

Here is a simple clock in HTML/Javascript:

<p>The time is <span id="clock">unknown<script language="javascript">
function clockTimeout()
{
    var clockSpan = document.getElementById("clock");
    var timeNode = document.createTextNode(new Date().toTimeString().substring(0, 8));
    clockSpan.replaceChild(timeNode, clockSpan.firstChild);
    window.setTimeout('clockTimeout()', 1000);
}
clockTimeout();
</script></span>.</p>

Hierarchies in SQL

I created an SQL script that demonstrates the 'interval' approach to managing hierarchies in SQL.  It is based upon approaches presented in Trees in SQL and Nested Intervals with Farey Fractions

Accounting Site

I was reading a good site that has introductory accounting material, accountingcoach.com.