Data Jelly

I've been trying out Canoo WebTest to automate some basic web site testing, and so far it seems to work pretty well. For a while, I was launching the tests from within Eclipse (my IDE), and was having no problems. Recently, I wanted to launch the tests as part of another script, but I was running into some cryptic messages when trying to launch Ant.

The Ant script would run without any noticible errors, but all WebTests would fail. If I opened the results, I could see the following stack trace explaining the failures:

Unexpected exception caught: org.apache.tools.ant.BuildException
at com.canoo.webtest.steps.StepUtil.handleException(StepUtil.java:111)
...
Caused by: java.lang.AbstractMethodError: org.cyberneko.html.HTMLScanner.getCharacterOffset()I
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:115)
...
Caused by: java.lang.AbstractMethodError: org.cyberneko.html.HTMLScanner.getCharacterOffset()I
at org.apache.xerces.xni.parser.XMLParseException.(Unknown Source)
...

After some searching and trying out different recommendations, I was able to get it working by calling "webtest.bat" (located in the Canoo WebTest "bin" directory) rather than directly calling Ant.