Spring 引导：无法在本地主机上访问 REST Controller (404)

Question

I am trying to adapt the REST Controller example on the Spring Boot website. Unfortunately I've got the following error when I am trying to access the localhost:8080/item URL.

{
  "timestamp": 1436442596410,
  "status": 404,
  "error": "Not Found",
  "message": "No message available",
  "path": "/item"
}

POM:

<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>SpringBootTest</groupId>
   <artifactId>SpringBootTest</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <properties>
      <javaVersion>1.8</javaVersion>
      <mainClassPackage>com.nice.application</mainClassPackage>
      <mainClass>${mainClassPackage}.InventoryApp</mainClass>
   </properties>

   <build>
      <plugins>
         <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.3</version>
            <configuration>
               <source>${javaVersion}</source>
               <target>${javaVersion}</target>
            </configuration>
         </plugin>

         <!-- Makes the Spring Boot app executable for a jar file. The additional configuration is needed for the cmd: mvn spring-boot:repackage 
            OR mvn spring-boot:run -->
         <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>

            <configuration>
               <mainClass>${mainClass}</mainClass>
               <layout>ZIP</layout>
            </configuration>
            <executions>
               <execution>
                  <goals>
                     <goal>repackage</goal>
                  </goals>
               </execution>
            </executions>
         </plugin>

         <!-- Create a jar with a manifest -->
         <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <version>2.4</version>
            <configuration>
               <archive>
                  <manifest>
                     <mainClass>${mainClass}</mainClass>
                  </manifest>
               </archive>
            </configuration>
         </plugin>
      </plugins>
   </build>

   <dependencyManagement>
      <dependencies>
         <dependency>
            <!-- Import dependency management from Spring Boot. This replaces the usage of the Spring Boot parent POM file. -->
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-dependencies</artifactId>
            <version>1.2.5.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
         </dependency>

         <!-- more comfortable usage of several features when developing in an IDE. Developer tools are automatically disabled when 
            running a fully packaged application. If your application is launched using java -jar or if it’s started using a special classloader, 
            then it is considered a 'production application'. Applications that use spring-boot-devtools will automatically restart whenever files 
            on the classpath change. -->
         <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
         </dependency>
      </dependencies>
   </dependencyManagement>

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

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

      <dependency>
         <groupId>com.google.guava</groupId>
         <artifactId>guava</artifactId>
         <version>15.0</version>
      </dependency>
   </dependencies>
</project>

Starter-Application:

package com.nice.application;
@SpringBootApplication // same as @Configuration @EnableAutoConfiguration @ComponentScan
public class InventoryApp {
   public static void main( String[] args ) {
      SpringApplication.run( InventoryApp.class, args );
   }
}

REST-Controller:

package com.nice.controller; 
@RestController // shorthand for @Controller and @ResponseBody rolled together
public class ItemInventoryController {
   public ItemInventoryController() {
   }

   @RequestMapping( "/item" )
   public String getStockItem() {
      return "It's working...!";
   }

}

I am building this project with Maven. Started it as jar (spring-boot:run) and as well inside the IDE (Eclipse).

Console Log:

2015-07-09 14:21:52.132  INFO 1204 --- [           main] c.b.i.p.s.e.i.a.InventoryApp          : Starting InventoryApp on 101010002016M with PID 1204 (C:\eclipse_workspace\SpringBootTest\target\classes started by MFE in C:\eclipse_workspace\SpringBootTest)
2015-07-09 14:21:52.165  INFO 1204 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@7a3d45bd: startup date [Thu Jul 09 14:21:52 CEST 2015]; root of context hierarchy
2015-07-09 14:21:52.661  INFO 1204 --- [           main] o.s.b.f.s.DefaultListableBeanFactory     : Overriding bean definition for bean 'beanNameViewResolver': 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]]
2015-07-09 14:21:53.430  INFO 1204 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2015-07-09 14:21:53.624  INFO 1204 --- [           main] o.apache.catalina.core.StandardService   : Starting service Tomcat
2015-07-09 14:21:53.625  INFO 1204 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.0.23
2015-07-09 14:21:53.731  INFO 1204 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2015-07-09 14:21:53.731  INFO 1204 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1569 ms
2015-07-09 14:21:54.281  INFO 1204 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean        : Mapping servlet: 'dispatcherServlet' to [/]
2015-07-09 14:21:54.285  INFO 1204 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'characterEncodingFilter' to: [/*]
2015-07-09 14:21:54.285  INFO 1204 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2015-07-09 14:21:54.508  INFO 1204 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@7a3d45bd: startup date [Thu Jul 09 14:21:52 CEST 2015]; root of context hierarchy
2015-07-09 14:21:54.573  INFO 1204 --- [           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)
2015-07-09 14:21:54.573  INFO 1204 --- [           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)
2015-07-09 14:21:54.594  INFO 1204 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2015-07-09 14:21:54.594  INFO 1204 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2015-07-09 14:21:54.633  INFO 1204 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2015-07-09 14:21:54.710  INFO 1204 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2015-07-09 14:21:54.793  INFO 1204 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2015-07-09 14:21:54.795  INFO 1204 --- [           main] c.b.i.p.s.e.i.a.InventoryApp          : Started InventoryApp in 2.885 seconds (JVM running for 3.227)
2015-07-09 14:22:10.911  INFO 1204 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring FrameworkServlet 'dispatcherServlet'
2015-07-09 14:22:10.911  INFO 1204 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization started
2015-07-09 14:22:10.926  INFO 1204 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization completed in 15 ms

What I've tried so far:

• Accessing the URL with the application name (InventoryApp)
• Put another @RequestMapping("/") at class level of the ItemInventoryController

As far as I understood, I won't need an application-context when using Spring Boot. Am I right?

What else can I do to access the method via URL?

Answer 1

Try adding the following to your InventoryApp class

@SpringBootApplication
@ComponentScan(basePackageClasses = ItemInventoryController.class)
public class InventoryApp {
...

spring-boot will scan for components in packages below com.nice.application , so if your controller is in com.nice.controller you need to scan for it explicitly.

Answer 2

Adding to MattR's answer:

As stated in here , @SpringBootApplication automatically inserts the needed annotations: @Configuration , @EnableAutoConfiguration , and also @ComponentScan ; however, the @ComponentScan will only look for the components in the same package as the App, in this case your com.nice.application , whereas your controller resides in com.nice.controller . That's why you get 404 because the App didn't find the controller in the application package.

Answer 3

Same 404 response I got after service executed with the below code

@Controller
@RequestMapping("/duecreate/v1.0")
public class DueCreateController {

}

Response:

{
"timestamp": 1529692263422,
"status": 404,
"error": "Not Found",
"message": "No message available",
"path": "/duecreate/v1.0/status"
}

after changing it to below code I received proper response

@RestController
@RequestMapping("/duecreate/v1.0")
public class DueCreateController {

}

Response:

{
"batchId": "DUE1529673844630",
"batchType": null,
"executionDate": null,
"status": "OPEN"
}

Answer 4

SpringBoot developers recommend to locate your main application class in a root package above other classes. Using a root package also allows the @ComponentScan annotation to be used without needing to specify a basePackage attribute. Detailed info But be sure that the custom root package exists.

Answer 5

There are 2 method to overcome this

1. Place the bootup application at start of the package structure and rest all controller inside it.

   Example :

   package com.spring.boot.app; - You bootup application(ie Main Method -SpringApplication.run(App.class, args);)

   You Rest Controller in with the same package structure Example : package com.spring.boot.app.rest;

2. Explicitly define the Controller in the Bootup package.

Method 1 is more cleaner.

Answer 6

I had this issue and what you need to do is fix your packages. If you downloaded this project from http://start.spring.io/ then you have your main class in some package. For example if the package for the main class is: "com.example" then and your controller must be in package: "com.example.controller". Hope this helps.

Answer 7

You need to modify the Starter-Application class as shown below.

@SpringBootApplication

@EnableAutoConfiguration

@ComponentScan(basePackages="com.nice.application")

@EnableJpaRepositories("com.spring.app.repository")

public class InventoryApp extends SpringBootServletInitializer {..........

And update the Controller, Service and Repository packages structure as I mentioned below.

Example: REST-Controller

package com.nice.controller; --> It has to be modified as
package com.nice.application.controller;

You need to follow proper package structure for all packages which are in Spring Boot MVC flow.

So, If you modify your project bundle package structures correctly then your spring boot app will work correctly.

Answer 8

Replace @RequestMapping( "/item" ) with @GetMapping(value="/item", produces=MediaType.APPLICATION_JSON_VALUE) .

Maybe it will help somebody.

Answer 9

for me, I was adding spring-web instead of the spring-boot-starter-web into my pom.xml

when i replace it from spring-web to spring-boot-starter-web, all maping is shown in the console log.

Answer 10

The controller should be in accessible in the same namespace This is what you have

This is how it should be

Answer 11

I had exact same error, I was not giving base package. Giving correct base package,ressolved it.

package com.ymc.backend.ymcbe;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
@ComponentScan(basePackages="com.ymc.backend")
public class YmcbeApplication {

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

}

Note: not including .controller @ComponentScan(basePackages="com.ymc.backend.controller") because i have many other component classes which my project does not scan if i just give .controller

Here is my controller sample:

package com.ymc.backend.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


@RestController
@CrossOrigin
@RequestMapping(value = "/user")
public class UserController {

    @PostMapping("/sendOTP")
    public String sendOTP() {
        return "OTP sent";
    };


}

Answer 12

I found a really great thread for this issue.

https://coderanch.com/t/735307/frameworks/Spring-boot-Rest-api

The controller api should be in the sub directory structure to automatically detect the controllers. Otherwise annotation argument can be used.

@SpringBootApplication(scanBasePackages = {"com.example.demo", "com.example.Controller"})

Answer 13

Sometimes spring boot behaves weird. I specified below in application class and it works:

@ComponentScan("com.seic.deliveryautomation.controller")

Answer 14

I got the 404 problem, because of Url Case Sensitivity .

For example @RequestMapping(value = "/api/getEmployeeData",method = RequestMethod.GET) should be accessed using http://www.example.com/api/getEmployeeData . If we are using http://www.example.com/api/getemployeedata , we'll get the 404 error.

Note: http://www.example.com is just for reference which i mentioned above. It should be your domain name where you hosted your application.

After a lot of struggle and apply all the other answers in this post, I got that the problem is with that url only. It might be silly problem. But it cost my 2 hours. So I hope it will help someone.

Answer 15

如果我们使用如下方式，它也可以工作：

@SpringBootApplication(scanBasePackages = { "<class ItemInventoryController package >.*" })

Answer 16

It could be that something else is running on port 8080, and you're actually connecting to it by mistake.

Definitely check that out, especially if you have dockers that are bringing up other services you don't control, and are port forwarding those services.

Answer 17

The problem is with your package structure. Spring Boot Application has a specific package structure to allow spring context to scan and load various beans in its context.

In com.nice.application is where your Main Class is and in com.nice.controller, you have your controller classes.

Move your com.nice.controller package into com.nice.application so that Spring can access your beans.

Answer 18

Another solution in case it helps: in my case, the problem was that I had a @RequestMapping("/xxx") at class level (in my controller), and in the exposed services I had @PostMapping (value = "/yyyy") and @GetMapping (value = "/zzz") ; once I commented the @RequestMapping("/xxx") and managed all at method level, worked like a charm.

Answer 19

For me, the problem was that I had set up the Application in a way that it always immediately shut down after starting. So by the time I tried out if I could access the controller, the Application wasn't running anymore. The problem with immediately shutting down is adressed in this thread .

Answer 20

@SpringBootApplication @ComponentScan(basePackages = {"com.rest"}) // basePackageClasses = HelloController.class) // use above componnent scan to add packages public class RestfulWebServicesApplication {

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

}

Answer 21

There may 3 reasons causing for this error:

1>

check your URL you are requesting is correct

2> check if your

using MVC then use @Controller else use @RestController

3> check

whether you have placed Controller package(or Class) outside the root package example: com.example.demo -> is your main package

place controller package inside com.example.demo.controller

Answer 22

我遇到了同样的问题，因为我创建了一个用@Configuration注释的内部类，它以某种方式禁止了组件扫描。

Answer 23

I had the same problem, and while the above solution are correct in their own right, they did not work for me, and I found another possible reason that solved it - you have to shut down the application from the port, and restart your application, if doing a Maven Update or a project clean fail to solve it.

Briefly, open a command prompt, and run the following two commands:

netstat -ano | findstr :8080

This command will locate the Process ID that is attached at the port that your app is running on - please make sure to specify the port, if you have it anywhere other than the default.

You will get the following output:

What you care about is the number in the last column, which is the process ID associated with the port, on which the instance of the app is running.

If you are using STS4 for your development purposes, you can also see the PID on the top margin of the console, but you do have to squint for it:

At this point, run the next command to kill the process:

taskkill /pid 22552 /f

And it results in this:

Do remember that there will be a different PID for every time you run the application.

And finally, you can run it again, and that should do it.

More relevant materials: Closing network connections

Programmatically shutting down SpringBoot app

Answer 24

New to Springboot, tried everything above, but ended up being as simple as I had a / at the end of the URL on my browser while my only Get() method was blank, just returning a string. Hope this'll help someone someday.

Answer 25

Change the Return type from String to ResponseEntity

Like : 
@RequestMapping( "/item" )
public ResponseEntity<String> getStockItem() {
        return new ResponseEntity<String>("It's working...!", HttpStatus.OK);
}

Answer 26

将你的 springbootapplication 类放在根包中，例如，如果你的服务，控制器在 springBoot.xyz 包中，那么你的主类应该在 springBoot 包中，否则它不会扫描下面的包

Answer 27

You can add inside the POM.

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-configuration-processor</artifactId>
    <version>XXXXXXXXX</version>
</dependency>

Answer 28

您的URL应该是，您缺少应用程序上下文：localhost：8080 / SpringBootTest / item