@Override
    JAXBContextCacheKey getJAXBContextCacheKey(Class<?> clazz) {
      return new JAXBContextPackageCacheKey(clazz.getPackage().getName(), clazz.getClassLoader());
    }
Provides differents ways to instantiate a JAXB Context.
jaxb/src/main/java/feign/jaxb/JAXBContextInstantationMode.java