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  1. ,

    The persistence_2_0.xsd enforces the order of the elements in the xml. Re-ordering them makes then error go away.

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Content is not allowed in prolog.
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org.xml.sax.SAXParseException: Content is not allowed in prolog.	at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(UnknownSource)