1783581 - Error: "org.xml.sax.SAXParseException: Content is not allowed in prolog" when parsing stack.xml file

Upgrade with SUM stops with the following error fragment: "org.xml.sax.SAXParseException: Content is not allowed in prolog"

This occurs right after an operation where the stack.xml has been read. It cannot be parsed.

The following error message could also be seen in SUM logs:

[Error ]: The following problem has occurred during step execution: com.sap.sdt.j2ee.tools.spxmlparser.SPXmlParserException: <path to INBOX>/<name of stack xml>.xml is not a valid stack definition file.

Could not parse XML file <path to INBOX>/<name of stack xml>.xml

org.xml.sax.SAXException has occurred: Content is not allowed in prolog.

Please note that the error messages above are examples only.

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SAP NetWeaver 2004 ; SAP NetWeaver 7.0 ; SAP NetWeaver 7.3 ; SAP NetWeaver 7.4 ; SAP enhancement package 1 for SAP NetWeaver 7.0 ; SAP enhancement package 1 for SAP NetWeaver 7.3 ; SAP enhancement package 2 for SAP NetWeaver 7.0 ; SAP enhancement package 3 for SAP NetWeaver 7.0

Content is not allowed in prolog, damaged stack xml, hex character, UPG, SUM , KBA , BC-UPG-TLS-TLJ , Upgrade tools for Java , Problem