code: public static void applyWsdlExtensions(Bus bus) {
  
          ExtensionRegistry registry = bus.getExtension(WSDLManager.class).getExtensionRegistry();
  
          try {
  
              JAXBExtensionHelper.addExtensions(registry,
                      javax.wsdl.Definition.class,
                      org.talend.esb.mep.requestcallback.impl.wsdl.PLType.class);
  
              JAXBExtensionHelper.addExtensions(registry,
                      javax.wsdl.Binding.class,
                      org.talend.esb.mep.requestcallback.impl.wsdl.CallbackExtension.class);
  
          } catch (JAXBException e) {
              throw new RuntimeException("Failed to add WSDL JAXB extensions", e);
          }
      }
docs: Adds JAXB WSDL extensions to allow work with custom
  WSDL elements such as \"partner-link\"
  
  @param bus CXF bus