code: @Override
    public <V> MethodVault<V> newMethod(Class<?> type, 
                                        String methodName,
                                        Class<?> []paramTypes)
    {
      Objects.requireNonNull(type);
      
      MethodVault<V> method = newMethodRec(type, methodName, paramTypes);
  
      if (method != null) {
        return method;
      }
      
      throw new IllegalStateException(L.l("Unknown method {0}.{1} {2}",
                                          type.getSimpleName(),
                                          methodName,
                                          Arrays.asList(paramTypes)));
    }
docs: Creates a stub method for an abstract method, typically a createXXX
  method.