code: public void setMessageResolvers(final Set<IMessageResolver> messageResolvers) {
          Validate.notNull(messageResolvers, "Message Resolver set cannot be null");
          checkNotInitialized();
          this.messageResolvers.clear();
          for (final IMessageResolver messageResolver : messageResolvers)  {
              addMessageResolver(messageResolver);
          }
      }
docs: <p>
  Sets the message resolvers to be used by this template engine.
  </p>
  <p>
  This operation can only be executed before processing templates for the first
  time. Once a template is processed, the template engine is considered to be
  <i>initialized</i>, and from then on any attempt to change its configuration
  will result in an exception.
  </p>
  
  @param messageResolvers the Set of template resolvers.