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@Autowired
private SimpMessagingTemplate simpMessagingTemplate;

@Autowired
private SpringTemplateEngine springTemplateEngine;

private void send() {
    Map<String, Object> params = new HashMap<>();
    params.put("name", "Willem");

    final IContext cts = new Context(Locale.ITALY, params);
    String result = springTemplateEngine.process("hello", ctx);

    simpMessagingTemplate.convertAndSend(destination, result);
}

@Configuration
public class ThymeleafConfig extends WebMvcConfigurerAdapter {

@Bean
public ClassLoaderTemplateResolver templateResolver() {
    ClassLoaderTemplateResolver templateResolver = new ClassLoaderTemplateResolver();

    templateResolver.setPrefix("thymeleaf/");
    templateResolver.setCacheable(false);
    templateResolver.setSuffix(".html");
    templateResolver.setTemplateMode("HTML5");
    templateResolver.setCharacterEncoding("UTF-8");

    return templateResolver;
}

@Bean
public SpringTemplateEngine templateEngine() {
    SpringTemplateEngine templateEngine = new SpringTemplateEngine();

    templateEngine.setTemplateResolver(templateResolver());

    return templateEngine;
}

@Bean
public ViewResolver viewResolver() {
    ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();

    viewResolver.setTemplateEngine( templateEngine());
    viewResolver.setCharacterEncoding("UTF-8");

    return viewResolver;
}
}

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org" xmlns="http://www.w3.org/1999/xhtml">
<body>
    <h2>Hello ${name} - THYMELEAF</h2>
</body>
</html>

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<body>
    <h2>Hello ${name} - THYMELEAF</h2>
</body>
</html>