UiXML with Struts: Illegal Access Error

Question

I created a project in JDeveloper for the example found in the JDeveloper help documentation, "Using uiXML with Struts". It says I need uix-config.xml in my WEB-INF directory. I created one and copied the xml from the example to it. When I run login.uix from JDeveloper I get:
500 Internal Server Error
java.lang.IllegalAccessError: oracle/cabo/servlet/struts/ui/MessageDataProvider
java.lang.Object oracle.cabo.servlet.struts.ui.DataProviderParserFactory$Parser.getNodeValue(oracle.cabo.share.xml.ParseContext, java.lang.String, java.lang.String, org.xml.sax.Attributes)
void oracle.cabo.share.xml.LeafNodeParser.startElement(oracle.cabo.share.xml.ParseContext, java.lang.String, java.lang.String, org.xml.sax.Attributes)
void oracle.cabo.share.xml.TreeBuilder$Handler.startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)
void oracle.cabo.share.xml.ParserAdapter.startElement(java.lang.String, org.xml.sax.AttributeList)
void oracle.xml.parser.v2.XMLContentHandler.startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)
XMLContentHandler.java:166
I notice if I remove that file, I don't get this error, but the struts components do nothing, which seems logical if we do indeed need this configuration information.
I also notice the following error in JDeveloper when I compile login.uix:
Warning(11,44): logon.uix: Parsing error, line 11, column 44: <form> is not an understood element.
This sometimes means the element's namespace (http://xmlns.oracle.com/uix/struts) is set incorrectly. This may also be an issue with the syntax of its parent element.
I'm not sure what that is.
Thanks for your help,
-James

Answer 1

That solved the problem! I am relatatively new to
all this as are many of us "seasoned developers"...and learning
fast...well...sort of.
Another observation: I placed the following entry,
oracle.cabo.servlet.struts.StrutsUIExtension, in my web.xml file
(borrowed from a plain ol' jsp struts test I've been working
with). Here's the whole section for the uix servlet:
<servlet>
<servlet-name>uix</servlet-name>
<servlet-class>oracle.cabo.servlet.UIXServlet</servlet-class>
<init-param>
<param-name>oracle.cabo.servlet.pageBroker</param-name>
<param-value>oracle.cabo.servlet.xml.UIXPageBroker</param-value>
</init-param>
<init-param>
<param-name>oracle.cabo.ui.UIExtensions</param-name>
<param-value>oracle.cabo.servlet.struts.StrutsUIExtension,oracle.cabo.data.jbo.ui.JboUIExtension</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
That solved the parsing errors I was receiving from JDeveloper
saying that certain elements were not understood. But
then...when I run logon.uix, the browser displayed this lovely
error:
java.lang.IllegalStateException: ParserFactory already registered at http://xmlns.oracle.com/uix/struts
AAAAAAARGHH! Sooooooo...I removed the uix-config.xml from
the WEB-INF directory, and hooray! I got my form. Whew!
I can also get it to run by leaving my uix-config.xml alone and
removing that entry in web.xml. Weird? Anyway, I'm leaving out
the entry in uix-config.xml or just not including it for now.
I'm sure I'll run in to some other problem with that later :)
The little application doesn't work quite right yet. When I
click the "Log On" button I get a "Page not found". Must be a
typo or something.
Anyway, thanks for your help Adam. I'm sure I'll have more
questions later. I'll try to make them good ones.
-James