如何解决：** Whitelabel 错误页面。** 我得到 **此应用程序没有明确的 /error 映射，因此您将此视为后备。**
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【中文标题】如何解决：** Whitelabel 错误页面。** 我得到 **此应用程序没有明确的 /error 映射，因此您将此视为后备。**【英文标题】：How to solve: ** Whitelabel Error Page.** I am getting **This application has no explicit mapping for /error, so you are seeing this as a fallback.** 【发布时间】：2021-07-15 07:32:36 【问题描述】：当我点击 URL：http://localhost:8080/login 时，我得到了 白标错误页面 此应用程序没有显式映射 /error，因此您将其视为后备。 2021 年 4 月 21 日星期三 11:24:00 IST 出现意外错误（类型=未找到，状态=404）。错误。我该如何解决这个问题？
主类
package com.springboot.controller;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
@EntityScan(basePackages="com.springboot.controller.model")
@EnableJpaRepositories(basePackages="com.springboot.controller.Repository")
@SpringBootApplication(scanBasePackages="com.springboot.controller")
public class RestApi
public static void main(String[] args)
SpringApplication.run(RestApi.class, args);
登录控制器
package com.springboot.controller.Resource;
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.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;
@RestController
public class LoginController
@RequestMapping("/login")
@ResponseBody
public ModelAndView checkMVC()
ModelAndView mav= new ModelAndView("LoginForm");
return mav;
UserRepo.java
package com.springboot.controller.Repository;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Service;
import com.springboot.controller.model.User;
@Service("UserRepo")
public interface UserRepo extends JpaRepository<User,Integer>
String findByEmail(String email);
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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.3</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.springboot.controller</groupId>
<artifactId>cunsultustoday-web-services</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>cunsultustoday-web-services</name>
<description>Demo project for Spring Boot</description>
<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-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>commons-configuration</groupId>
<artifactId>commons-configuration</artifactId>
<version>1.9</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
<exclusions>
<exclusion>
<groupId>io.lettuce</groupId>
<artifactId>lettuce-core</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
日志
:: Spring Boot :: (v2.4.3)
2021-04-21 11:23:50.952 INFO 13080 --- [ main] com.springboot.controller.RestApi : Starting RestApi using Java 15.0.2 on Dell with PID 13080 (C:\Users\Ins\Desktop\Project\CunsultUsToday\CunsultUsToday\target\classes started by Ins in C:\Users\Ins\Desktop\Project\CunsultUsToday\CunsultUsToday)
2021-04-21 11:23:50.955 INFO 13080 --- [ main] com.springboot.controller.RestApi : No active profile set, falling back to default profiles: default
2021-04-21 11:23:51.546 INFO 13080 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!
2021-04-21 11:23:51.546 INFO 13080 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2021-04-21 11:23:51.604 INFO 13080 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 48 ms. Found 3 JPA repository interfaces.
2021-04-21 11:23:51.795 INFO 13080 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!
2021-04-21 11:23:51.796 INFO 13080 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data Redis repositories in DEFAULT mode.
2021-04-21 11:23:51.816 INFO 13080 --- [ main] .RepositoryConfigurationExtensionSupport : Spring Data Redis - Could not safely identify store assignment for repository candidate interface com.springboot.controller.Repository.ClgRegRepo. If you want this repository to be a Redis repository, consider annotating your entities with one of these annotations: org.springframework.data.redis.core.RedisHash (preferred), or consider extending one of the following types with your repository: org.springframework.data.keyvalue.repository.KeyValueRepository.
2021-04-21 11:23:51.817 INFO 13080 --- [ main] .RepositoryConfigurationExtensionSupport : Spring Data Redis - Could not safely identify store assignment for repository candidate interface com.springboot.controller.Repository.StudentRegRepo. If you want this repository to be a Redis repository, consider annotating your entities with one of these annotations: org.springframework.data.redis.core.RedisHash (preferred), or consider extending one of the following types with your repository: org.springframework.data.keyvalue.repository.KeyValueRepository.
2021-04-21 11:23:51.818 INFO 13080 --- [ main] .RepositoryConfigurationExtensionSupport : Spring Data Redis - Could not safely identify store assignment for repository candidate interface com.springboot.controller.Repository.UserRepo. If you want this repository to be a Redis repository, consider annotating your entities with one of these annotations: org.springframework.data.redis.core.RedisHash (preferred), or consider extending one of the following types with your repository: org.springframework.data.keyvalue.repository.KeyValueRepository.
2021-04-21 11:23:51.818 INFO 13080 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 11 ms. Found 0 Redis repository interfaces.
2021-04-21 11:23:52.325 INFO 13080 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2021-04-21 11:23:52.342 INFO 13080 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2021-04-21 11:23:52.343 INFO 13080 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.43]
2021-04-21 11:23:52.698 INFO 13080 --- [ main] org.apache.jasper.servlet.TldScanner : At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
2021-04-21 11:23:52.709 INFO 13080 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2021-04-21 11:23:52.709 INFO 13080 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1688 ms
2021-04-21 11:23:52.881 INFO 13080 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [name: default]
2021-04-21 11:23:52.940 INFO 13080 --- [ main] org.hibernate.Version : HHH000412: Hibernate ORM core version 5.4.28.Final
2021-04-21 11:23:53.087 INFO 13080 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations 5.1.2.Final
2021-04-21 11:23:53.206 INFO 13080 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2021-04-21 11:23:53.377 INFO 13080 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2021-04-21 11:23:53.396 INFO 13080 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
2021-04-21 11:23:54.035 INFO 13080 --- [ main] o.h.e.t.j.p.i.JtaPlatformInitiator : HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
2021-04-21 11:23:54.044 INFO 13080 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2021-04-21 11:23:54.556 WARN 13080 --- [ main] JpaBaseConfiguration$JpaWebConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2021-04-21 11:23:54.651 INFO 13080 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2021-04-21 11:23:54.990 INFO 13080 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2021-04-21 11:23:54.998 INFO 13080 --- [ main] com.springboot.controller.RestApi : Started RestApi in 4.441 seconds (JVM running for 5.327)
2021-04-21 11:24:00.446 INFO 13080 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2021-04-21 11:24:00.446 INFO 13080 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2021-04-21 11:24:00.447 INFO 13080 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 0 ms
日志中没有显示错误，但我仍然收到此 whitelabel 错误页面
请帮忙。
【问题讨论】：
你为什么用@RestController而不是@Controller注释LoginController？错误页面告诉你/login没有找到。
好的，我会改的。
我将 @RestController 更改为 @Controller 现在日志显示 os.web.servlet.PageNotFound : No mapping for GET /login 问题仍未解决。 @dan1st
您是否在 application.properties 中定义了上下文路径？
没有。 #mvc view spring.mvc.view.prefix=/WEB-INF/views/ spring.mvc.view.suffix=.jsp spring.mvc.static-path-pattern=/resources/** server.port=8080这是我的application.properties @Alien
【参考方案1】：
您没有指定方法和值。请参阅下面的屏幕截图。 https://www.baeldung.com/spring-requestmapping 例如：
@RequestMapping(value = "/login", method = RequestMethod.POST)
@ResponseBody
public ModelAndView checkMVC()
ModelAndView mav= new ModelAndView("LoginForm");
return mav;
【讨论】：
其实没关系...如果没有指定方法，它适用于 GET以上是关于如何解决：** Whitelabel 错误页面。** 我得到 **此应用程序没有明确的 /error 映射，因此您将此视为后备。**的主要内容，如果未能解决你的问题，请参考以下文章
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