Spring boot未显示index.html

com.tuke.doto.Controllers / RootController.java

package com.tuke.doto.Controllers;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class RootController {

    @RequestMapping("/")
    public String root() {
        return "frontpage";
    }
}

我有 frontpage.html 在里面 main/resources/static (我还试图将其移动到 main/resources/templates

当我请求时 localhost:8080

HTTP Status [404] – [Not Found]

Type Status Report

Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

Apache Tomcat/8.5.15

在jetbrains intellij上的控制台中,我看到:

javax.servlet.ServletException: Circular view path [error]: would dispatch back to the current handler URL [/error] again. Check your ViewResolver setup! (Hint: This may be the result of an unspecified view, due to default view name generation.)

我还包括 server.error.whitelabel.enabled=false main/resources/application.properties

问题出在哪里?这不是最简单的例子吗?为什么它不起作用?

编辑

dependencies {
    compile('org.springframework.boot:spring-boot-starter-web')
    compile('org.springframework.boot:spring-boot-starter-websocket')

    compile("org.springframework.boot:spring-boot-devtools")

    testCompile('org.springframework.boot:spring-boot-starter-test')
}