Define a Spring MVC ViewResolver?

A ViewResolver maps the logical view name a controller returns (like "productList") to an actual renderable View object, such as a JSP, Thymeleaf template, or another template engine's output. It's only invoked for traditional server-rendered controllers, not @RestController endpoints.

@Controller
public class ProductPageController {
    @GetMapping("/products")
    public String list(Model model) {
        model.addAttribute("products", productService.findAll());
        return "productList"; // resolved by a ViewResolver
    }
}

Spring Boot auto-configures a ViewResolver matching whatever templating starter is on the classpath - spring-boot-starter-thymeleaf, for instance, wires up ThymeleafViewResolver automatically, prefixing and suffixing the returned name to locate the actual template file.

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