public JAXBDecoder build() {
      if (jaxbContextFactory == null) {
        throw new IllegalStateException("JAXBContextFactory must be non-null");
      }
      return new JAXBDecoder(this);
    }
Controls whether the underlying XML parser is namespace aware. Default is true.
jaxb-jakarta/src/main/java/feign/jaxb/JAXBDecoder.java