Should OPS validate and report errors when there are duplicate id's in
the input document? Or is this too expensive?
If not, the type of the return value of
containingDocument.getObjectById(..) should be checked before casting -
I just got a hard-to-debug ClassCastException when I made the mistake of
generating a document containing a <xforms:group> that had the same id
as a <xforms:instance>:
java.lang.ClassCastException
at
org.orbeon.oxf.xforms.processor.handlers.XFormsGroupHandler.start(XFormsGroupHandler.java:44)
at
org.orbeon.oxf.xml.ElementHandlerController.startElement(ElementHandlerController.java:145)
at org.orbeon.oxf.xml.SAXStore.replay(SAXStore.java:162)
at
org.orbeon.oxf.xforms.processor.XFormsToXHTML.outputResponse(XFormsToXHTML.java:498)
at
org.orbeon.oxf.xforms.processor.XFormsToXHTML.doIt(XFormsToXHTML.java:220)
(the returned value was being cast to ControlInfo when in fact it was a
XFormsInstance).
Even with a type check though, all sorts of things obscure errors could
still arise if you gave input controls the same id...
Adrian
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