Spring Boot Whitelabel错误页面（类型=未找到，状态= 404）

Question

下午好！我正在开始春季学习，我正在以相同的方式学习教程，但它返回一个错误：

文件夹结构：

奇怪的是：如果我将“EventoController.java”插入到br.com.SpringApp.SpringApp中，它可以正常工作。

package br.com.SpringApp.SpringApp;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringAppApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringAppApplication.class, args);
    }
}

.

package br.com.SpringApp.controller;

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

@Controller
public class EventoController {

    @RequestMapping("/cadastroEvento")
    public String form() {      
        return "evento/formEvento"; 
    }

}

根据要求，我正在添加pom.xml

   <?xml version="1.0" encoding="UTF-8"?>
   <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>br.com.SpringApp</groupId>
    <artifactId>SpringApp</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>SpringApp</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.10.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


   </project>

有人可以告诉我哪里错了，拜托？

Answer 1

确保您的主类位于其他类之上的根包中。

当您运行Spring Boot Application（即使用@SpringBootApplication注释的类）时，Spring将只扫描主类包下面的类。

所以你的声明是这样的

package br.com.SpringApp.SpringApp;在这个主类里面，即SpringAppApplication

控制器的package br.com.SpringApp.SpringApp.controller;名称，即EventoController和indexControllers

package br.com.SpringApp.SpringApp.model;您的模型的名称，即Evento

之后清理项目并重新运行spring boot应用程序;

Answer 2

验证你的pom.xml中是否有正确的百万富翁依赖：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>      
</dependency>