JAXB XML Unmarshalling validation problem

Question

Hello,
I'm using toplink JAXB to map XML document to an object hierarchy. The set of objects was built using Toplink workbench from the corresponding XSD file. The XSD file is specified in <toplink:resource> element using an absolute path. If I use unmarshaller validation (Unmarshaller u = jc.createUnmarshaller(); u.setValidating(true)) it works fine in embedded oc4j, but fails withan UnmarshalException "An internal error condition occurred" for Line N 1.
It looks like the cause of the exception is that toplink cannot find the XSD file. I've tried to put the XSD file into META-INF and into classes directly, and specify the relative path, but it has failed event locally in the embedded oc4j.
Everything works if I do not turn the validation on.
Has anybody gotten the same issue? What could be a solution if we have to perform the validation?
Thanks
Kate

Answer 1

Hello Kate,
One possible work around would be use the TopLink OXM specific APIs for this unmarshal. For the most part they mirror the JAXB APIs so there usage is pretty straight forward.
XMLContext xmlContext = new XMLContext(YOUR_JAXB_CONTEXT_PATH);
xmlUnmarshaller = xmlContext.createUnmarshaller();One API that we offer that is not part of the standard JAXB Unmarshaller is the ability to specify an EntityResolver. This class allows you to override where the XML Schema is loaded from.
EntityResolver entityResolver = new YourEntityResolver();
xmlUmarshaller.setEntityResolver(entityResolver);YourEntityResolver must implement org.xml.sax.EntityResolver. There is one method on this interface that returns an InputSource representing the XML Schema. You can implement this method to load the Schema from a ClassLoader.
-Blaise