Problem with SelectBooleanCheckbox

I'm a beginner with JSF. Trying to get a form working that uses checkboxes (among other things). I have the following column entry in an jspDataTable:
<h:form>
<h:dataTable value="#{fnc.objVector}" var="fnc" first="#{fnc.startIndex}" rows="2">
<f:facet name="header">
<h:outputText value="#{fnc.fileRange}" />
</f:facet>
<h:column>
<f:facet name="header">
<h:outputText value="Check In"/>
</f:facet>
<h:selectBooleanCheckbox value="#{fnc.bSelectCheckIn}"
valueChangeListener="#{fnc.selectCheckInBoxChanged}"
disabled="#{fnc.checkedIn}" />
</h:column>
etc. etc. etc.
The form comes up just fine and the checkbox looks ok. If I click the checkbox, the little checkmark shows on the screen. When I submit the form, the listener routine gets called, and tells me the value of the box is 'true'. So it looks like it is working. But then the web browser gives me the following page:
============
XML Parsing Error: not well-formed
Location: http://localhost:8084/NCAT/protected/doc_select.faces
Line Number 40, Column 61:<td><input type="checkbox" name="_id8:_id9:0:_id13" checked disabled="disabled" /></td>
------------------------------------------------------------^
The ^ is under the first 'd' in 'disabled="disabled"' in case this doesn't format properly. Is the problem the string 'disabled="disabled" (which is wrong - the checkbox is NOT disabled) or the 'checked' attribute - which is correct, because I've just put a checkmark in the box....
If the property fnc.checkedIn comes back true, the checkbox actually does get disabled, and I am not able to change its value, which is good. The problem occurs when the checkbox is not disabled initially, and I try to check it and then submit the form...
I'm not quite sure where to be looking for the problem. Any help would be appreciated...
Thanks very much,
nbc

It looks like Netbeans is using JSF 1.1 - that is what the libraries indicate. I copied the JSF 1.2 file onto my machine and replaced the 2 jar files jsf-api.jar and jsf-impl.jar in the Netbeans directory .../enterprise3/modules/ext. This directory also has commons-beanutils.jar, commons-collections.jar, commons-digester.jar and commons-logging.jar - I did not replace those. When I rebuild my application and try to run it, Tomcat fails to start - so I obviously have not updated JSF correctly.
It would be great if you can point me in the right direction here - I'm just about at the limits of my knowledge on Netbeans and well past it on JSF... And I do need to get those checkboxes working...
Thanks in advance,
nbc

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