Spring-boot and Thymeleaf not proecssing templates

spring-boot, spring-mvc, thymeleaf

Solution

These are the 2 options based on Thymeleaf Tutorials

Inlining Expression - MainController.java

package com.latencyzero.hoa;

import org.springframework.stereotype.Controller;    
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping("/")
class MainController
{
    @RequestMapping(method = RequestMethod.GET)
    ModelAndView
    index()
    {
        ModelAndView mav = new ModelAndView("index");
        mav.addObject("version", "0.1");
        return mav;
    }
}

- index.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8"/>
    <title>HOA v[[${version}]]</title>
</head>
<body>
<h1>HOA v[[${version}]]</h1>
</body>
</html>

Natural Template - MainController.java

package com.latencyzero.hoa;

import org.springframework.stereotype.Controller;    
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping("/")
class MainController
{
    @RequestMapping(method = RequestMethod.GET)
    ModelAndView
    index()
    {
        ModelAndView mav = new ModelAndView("index");
        mav.addObject("hoa_version", "HOA v0.1");
        return mav;
    }
}

- index.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8"/>
    <title th:text="${hoa_version}">Default Title</title>
</head>
<body>
<h1 th:text="${hoa_version}">Default Header</h1>
</body>
</html>

Problem

I have an app which is a simplified version of the Spring Bookmark tutorial. In it, Controllers are annotated with `@RestController` and the app only returns JSON. I've added to mine the ability to return HTML via Thymeleaf templates. My templates are being returned, but they don't seem to be processed by Thymeleaf. I'm using spring-boot, and I've `spring-boot-starter-thymeleaf` to my `build.gradle` file, but that doesn't seem to be enough. For example, here's a simple controller for the root: ``` package com.latencyzero.hoa; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.servlet.ModelAndView; @Controller @RequestMapping("/") class MainController { @RequestMapping(method = RequestMethod.GET) ModelAndView index() { ModelAndView mav = new ModelAndView("index"); mav.addObject("version", "0.1"); return mav; } } ``` and `src/main/resources/templates/index.html`: ``` <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"/> <title>HOA v${version}</title> </head> <body> <h1>HOA v${version}</h1> </body> </html> ``` Results in the following page being rendered: The examples I've found suggest this is all I need to do, but it's not working. Do I need some additional configuration annotations somewhere? Thanks.

Original source