[HtmlUnit] How to understand JavaScript errors

[Cort S. <co...@xm...>]

I have been playing with HtmlUnit all day and have been able to do a few
simple tests, but am having a problem with a page that is doing some
javascript validation before the form can be submitted.  I get the following
stack trace which does not help me much:

<stacktrace><![CDATA[Exception
class=[org.mozilla.javascript.JavaScriptException]com.gargoylesoftware.htmlu
nit.ScriptException: java.lang.NullPointerException	at
com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScript
Engine.java:153)	at
com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavascriptIfPossible(Html
Page.java:722)	at
com.gargoylesoftware.htmlunit.html.HtmlAnchor.click(HtmlAnchor.java:69)	at
com.seamlessweb.htmlunit.LoginTest.test_Order(LoginTest.java:141)
I am able to use the page without any issues us IE 6, which is what I set
the WebClient browser version to.  I had a few other problems with the
syntax of select objects (form.selectobject.options[index].value did not
appear to work), but was able to fumble through those with the information
in the exceptions.  Unfortunately this exception does not give me a line or
anything to give me a hint as to where it is having a problem.

Any assistance would be much appreciated.

Cort