src/java.xml.bind/share/classes/javax/xml/bind/ModuleUtil.java

*** 128,140 ****
       *
       * @throws JAXBException if ony of a classes package is not open to {@code java.xml.bind} module.
       */
      static void delegateAddOpensToImplModule(Class[] classes, Class<?> factorySPI) throws JAXBException {
          final Module implModule = factorySPI.getModule();
-         if (!implModule.isNamed()) {
-             return;
-         }
  
          Module jaxbModule = JAXBContext.class.getModule();
  
          for (Class cls : classes) {
              final Module classModule = cls.getModule();
--- 128,137 ----