Spring 问题：出现意外错误（类型=未找到，状态=404）
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【中文标题】Spring 问题：出现意外错误（类型=未找到，状态=404）【英文标题】：Issue With Spring: There was an unexpected error (type=Not Found, status=404) 【发布时间】：2016-08-17 14:05:21 【问题描述】：我正在阅读这本关于 Spring 的宁静 Web 服务的书。我决定放弃他们正在做的事情并使用 java 配置文件。出于某种原因，在切换到 Java 配置后，服务将正确运行（在控制台窗口中），但是当我实际转到 localhost 上的端点时，我得到了这个：
白标错误页面
这个应用程序没有明确的 /error 映射，所以你看到 这是一个后备。
2016 年 4 月 23 日星期六 20:48:25 PDT 出现意外错误（type=Not 找到，状态=404）。没有可用的消息
这是来自 GET 请求的响应：
"timestamp": 1461470029110,
"status": 404,
"error": "Not Found",
"message": "No message available",
"path": "/greeting"
这个故事的下一章开始于我去 Spring 网站上的入门页面 http://spring.io/guides/gs/rest-service/ 我决定开始一个小项目来重新创建他们的基础教程。我将在下面发布我编写的代码供您查看。问题是，我遇到了完全相同的问题。服务运行，但我无法到达端点。我不确定发生了什么，我看到其他人有类似的问题，但答案并没有适用/帮助我。我确信很明显我做错了，任何帮助将不胜感激。最后一条信息，如果有关系的话，我使用 IntelliJ IDEA 15 CE 作为我的 IDE。
被击中的端点：
http://localhost:8080/greeting
我的控制器
@RestController
public class GreetingController
private static final String template = "Hello, %s!";
private final AtomicLong counter = new AtomicLong();
@RequestMapping("/greeting")
public Greeting greeting(@RequestParam(value = "name", defaultValue = "World")String name)
return new Greeting(counter.incrementAndGet(), String.format(template, name));
我的资源表示类
public class Greeting
private final long id;
private final String content;
public Greeting(long id, String content)
this.id = id;
this.content = content;
public long getId()
return id;
public String getContent()
return content;
我的主要
@SpringBootApplication
public class Application
public static void main(String[] args)
SpringApplication.run(Application.class, args);
我的 POM 文件
<?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>com.organization_name.webservices</groupId>
<artifactId>helloworld</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.3.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
<properties>
<java.version>1.8</java.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-releases</id>
<url>https://repo.spring.io/libs-release</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-releases</id>
<url>https://repo.spring.io/libs-release</url>
</pluginRepository>
</pluginRepositories>
命令行运行
mvn spring-boot:run
来自控制台的完整日志
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.3.3.RELEASE)
2016-04-23 20:47:53.153 INFO 7898 --- [ main] c.t.webservices.application.Application : Starting Application on Macintosh.local with PID 7898 (/Users/<my_user>/Downloads/B04788_Code/HelloWorld/target/classes started by <my_user> in /Users/<my_user>/Downloads/B04788_Code/HelloWorld)
2016-04-23 20:47:53.156 INFO 7898 --- [ main] c.t.webservices.application.Application : No active profile set, falling back to default profiles: default
2016-04-23 20:47:53.242 INFO 7898 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@68ceda24: startup date [Sat Apr 23 20:47:53 PDT 2016]; root of context hierarchy
2016-04-23 20:47:54.084 INFO 7898 --- [ main] o.s.b.f.s.DefaultListableBeanFactory : Overriding bean definition for bean 'beanNameViewResolver' with a different definition: replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.class]]
2016-04-23 20:47:54.811 INFO 7898 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2016-04-23 20:47:54.840 INFO 7898 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat
2016-04-23 20:47:54.841 INFO 7898 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.0.32
2016-04-23 20:47:54.960 INFO 7898 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2016-04-23 20:47:54.960 INFO 7898 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1736 ms
2016-04-23 20:47:55.214 INFO 7898 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2016-04-23 20:47:55.218 INFO 7898 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2016-04-23 20:47:55.219 INFO 7898 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2016-04-23 20:47:55.219 INFO 7898 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2016-04-23 20:47:55.219 INFO 7898 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2016-04-23 20:47:55.545 INFO 7898 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@68ceda24: startup date [Sat Apr 23 20:47:53 PDT 2016]; root of context hierarchy
2016-04-23 20:47:55.605 INFO 7898 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "[/error]" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2016-04-23 20:47:55.606 INFO 7898 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "[/error],produces=[text/html]" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2016-04-23 20:47:55.628 INFO 7898 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2016-04-23 20:47:55.628 INFO 7898 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2016-04-23 20:47:55.657 INFO 7898 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2016-04-23 20:47:55.776 INFO 7898 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2016-04-23 20:47:55.848 INFO 7898 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2016-04-23 20:47:55.853 INFO 7898 --- [ main] c.t.webservices.application.Application : Started Application in 3.531 seconds (JVM running for 4.702)
2016-04-23 20:48:19.521 INFO 7898 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet'
2016-04-23 20:48:19.521 INFO 7898 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started
2016-04-23 20:48:19.533 INFO 7898 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 12 ms
GET 请求后更新控制台
2016-04-23 20:48:19.521 INFO 7898 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started
2016-04-23 20:48:19.533 INFO 7898 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 12 ms
停止后的控制台
2016-04-23 20:53:24.494 INFO 7898 --- [ Thread-2] ationConfigEmbeddedWebApplicationContext : Closing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@68ceda24: startup date [Sat Apr 23 20:47:53 PDT 2016]; root of context hierarchy
2016-04-23 20:53:24.495 INFO 7898 --- [ Thread-2] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown
Process finished with exit code 130
再次感谢您提供的任何帮助。我会及时通知大家更新！
【问题讨论】：
为了清楚起见 - 当您转到 localhost:8080/greeting 或只是 localhost:8080 时，您会看到白标签错误页面？当我转到 localhost:8080 时，我看到了同样的结果，但是当我转到 /greeting 时它工作得很好。 好问题，我应该更清楚。是的，GET 是针对端点本身进行的，localhost:8080/greeting 我更新了问题以反映现在:) 【参考方案1】：我相信您的问题与包裹有关。您的应用程序在com.organization_name.webservices.application 中定义。我猜你的其他类在一个不同的包中，它不是com.organization_name.webservices.application 的子包。 Spring 会自动加载同一个包或子包中的控制器，例如：
com.organization_name.webservices.application
com.organization_name.webservices.application.controllers
但不是这样的包：
com.organization_name.webservices.controllers
您可以通过移动控制器（或应用程序）或将 ComponentScan 添加到您的应用程序来解决此问题：
@SpringBootApplication
@ComponentScan(basePackageClasses=GreetingController.class)
public class Application
您应该会在日志中看到这一点：
Mapped "[/greeting]" onto public com.organization_name.webservices.xxx.Greeting com.organization_name.webservices.xxx.GreetingController.greeting(java.lang.String)
【讨论】：
必须额外添加：import org.springframework.context.annotation.ComponentScan;import main.java.hello.GreetingController;
如果您的请求映射没有被任何控制器处理，有时也会出现此错误。
谢谢，这真的很有帮助！【参考方案2】：
似乎您缺少 thymleaf 依赖项。把它放在你的 pom.xml 依赖项中
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
【讨论】：
完全正确。谢谢【参考方案3】：在 pom.xml 中添加如下依赖
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
【讨论】：
【参考方案4】： Adding these dependencies helped me :
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.6.1</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.6.1</version>
<scope>compile</scope>
</dependency>
@EnableSwagger2
@Configuration
public class swagger
public Docket productApi()
return new Docket(DocumentationType.SWAGGER_2)
.select()
.apis(RequestHandlerSelectors.basePackage("com.example.Mongo"))
.paths(regex("/mongo.*"))
.build();
【讨论】：
【参考方案5】：其实我也遇到了同样的错误。
根本原因是文件夹结构。
public static void main(String[] args)
main 方法包含的类应该放在第一位。
之后只剩下剩下的类和包。
【讨论】：
该问题的答案与控制器未放入正确的包中且 Spring 未看到这一事实有关。您的回答与此无关。我没有投反对票。你应该删除这个答案。以上是关于Spring 问题：出现意外错误（类型=未找到，状态=404）的主要内容，如果未能解决你的问题，请参考以下文章
Spring @RestController，spring-boot 出现意外错误（类型=不可接受，状态=406）