java.xml.ws depends on the internal class in java.xml module, specifically com.sun.xml.internal.stream.writers.XMLStreamWriterImpl class.

This qualified export from java.xml to java.xml.ws should be removed as java.xml.ws is upgradeable:

// reflection access from com.sun.xml.internal.ws.api.streaming.XMLStreamWriterFactory
   exports com.sun.xml.internal.stream.writers to java.xml.ws;