How do I send data via an Ajax Query to a Controller and then open a new JSP page as the Controller's return type?

This is a simplified version of a problem I'm having. How do I send data to a Spring Boot Controller via an AJAX Query and then open a new JSP page? When I send data to the url in the AJAX Query to the matching URL in my controller class it seems to run the code within that method but not open the JSP (or return type).

For example if I were to send the following data from an Ajax Query

var hello = "Hello World!";
$.ajax({
         type: "POST",
         url: "/message1",
         data: { 
                 message: hello, 
               }, 
         datatype: 'json'
      });
}

To this method in my Controller class

@RequestMapping(value = "/message1", method = RequestMethod.POST)
public String MessageReceiver(@RequestParam("message")String message, 
                              BindingResult bindingResult,              
                              Model model) {
    System.out.println(message);
    return "NewPage";
}

"Hello" will print in the console but the JSP page NewPagewill fail to open and will prompt no errors?

Usually if I just call the url in the controller (for example /message1) via a href link, or button etc the NewPage JSP page will open. It seems that the AJAX query is missing something. Do I have to update the URL in the Ajax Query to something similar to /message1/NewPage (tried this, didn't work), or add something to the controller because the NewPage JSP page will not open.