org.apache.jasper.JasperException: Failed to load or instantiate TagExtraInfo class
(I had to shorten the article title to fit!)
I’ve just had a problem when I’ve taken a web application from my local Tomcat 5.5 development server (where it worked fine) and uploaded it onto a public server (also using Tomcat 5.5).
We’re creating a web application that asks a number of questions about pumps (as it happens). Some of these questions are typical yes/no questions. But we need to make sure the user makes a positive choice. We don’t want to impose a choice on them. Which controls would you use?
Here’s the question with the [...]
We have several web applications derived from the same code base and as well as sharing the jars in WEB-INF/lib, we provide set of administration pages to allow users to configure and administer the applications. Until now, we’ve always had to make copies of the admin pages and this has caused us configuration headaches as [...]
If you’re writing a JSP using the JSTL tag <c:catch var=”myError”> … </c:catch> then I’m sure that you know that the next thing to do is to check after the closing catch tag to see if myError is empty. If not you can output some useful error message having successfully caught any exception. However, sometimes [...]
One of the problems with using HTML as the user interface is testing it (in fact testing user interfaces has always been a bit of a problem) so I’m always on the look out for good UI testing tools.
For a while I’ve known about and used Watir which scripts Internet Explorer (and [...]
Updated: now copes with multiple tables on the same page, non-drag and non-drop rows (such as headers) and embedding form elements. Also [...]
This is a little tip that I discovered a while ago but which I’m always forgetting, so I thought I’d post it here where I woudn’t lose it! Sometimes you’ll have a link on a web page which actually does something to a database, deletes the current thing for example. In those circumstances you want [...]
A friend recently pointed me to a useful development toolbar for Firefox. It’s similar to the development toolbar here but does even more stuff.
You can find the toolbar at http://chrispederick.com/work/webdeveloper/.
I’ve recently been trying to make some of my scripts work with Firefox 1.5 (from IE) and I was looking for some debugging help to set me on the right track. I found this tool which seems to work very well: http://getahead.ltd.uk/ajax/venkman.
It’s an updated version of Venkman fixed to work with [...]
If you are doing web development for Internet Explorer, then have a look at this toolbar from Microsoft.
It provides all sorts of useful features: it’ll validate the HTML, show the sizes of images, where tables and cells and DIVs are, allow you to see the DOM and all sorts of other useful [...]
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