I found that one can also manually specify JVM-Arguments to not use the Oracle JXSaxParserFactory with
-Djavax.xml.parsers.SAXParserFactory=com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl
I could debug this using
-Djaxp.debug=1
Further infos regarding which ParserFactory gets picked up can be found here: https://docs.oracle.com/javase/tutorial/jaxp/properties/usingProps.html.