Rest Controller non riconosce la richiesta GET in Spring Boot App

Question

Sto cercando di implementare una semplice app demo MVC con Spring Boot ma ottengo 404 errori durante l'esecuzione dell'applicazione. L'uri è `http://localhost:8080/ 'che serve per visualizzare tutte le righe in una tabella chiamata circle.

• Primavera Boot: 1.3.3.RELEASE
• Java Version: 1.8.0_65
• Database: Apache Derby 10.12.1.1

Maven Java del progetto:

Application.java

package com.nomad.dubbed.app; 

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

@SpringBootApplication 
public class Application { 

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

} 

CircleController.java

package com.nomad.dubbed.controller; 

import java.util.List; 

import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RequestMethod; 
import org.springframework.web.bind.annotation.RestController; 

import com.nomad.dubbed.dao.CircleService; 
import com.nomad.dubbed.model.Circle; 

@RestController 
@RequestMapping("/") 
public class CircleController { 
    @Autowired 
    private CircleService circleService; 

    @RequestMapping(method=RequestMethod.GET) 
    public List<Circle> getAll() { 
     return circleService.getAll(); 
    } 

} 

CircleRepository.java

package com.nomad.dubbed.dao; 

import org.springframework.data.jpa.repository.JpaRepository; 
import org.springframework.stereotype.Repository; 

import com.nomad.dubbed.model.Circle; 

@Repository 
public interface CircleRepository extends JpaRepository<Circle, Integer> { 

} 

CircleService.java

package com.nomad.dubbed.dao; 

import java.util.List; 

import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.stereotype.Service; 
import org.springframework.transaction.annotation.Propagation; 
import org.springframework.transaction.annotation.Transactional; 

import com.nomad.dubbed.model.Circle; 

@Service 
public class CircleService { 
    @Autowired 
    private CircleRepository circleRepository; 

    @Transactional(propagation=Propagation.REQUIRED) 
    public List<Circle> getAll(){ 
     return circleRepository.findAll(); 
    } 

} 

Circle.java

package com.nomad.dubbed.model; 

import javax.persistence.Entity; 
import javax.persistence.GeneratedValue; 
import javax.persistence.GenerationType; 
import javax.persistence.Id; 
import javax.persistence.Table; 

@Entity 
@Table(name="circle") 
public class Circle { 
    @Id 
    @GeneratedValue(strategy=GenerationType.IDENTITY) 
    private int id; 
    private String name; 

    public Circle(int id, String name) { 
     super(); 
     this.id = id; 
     this.name = name; 
    } 

    public int getId() { 
     return id; 
    } 
    public void setId(int id) { 
     this.id = id; 
    } 
    public String getName() { 
     return name; 
    } 
    public void setName(String name) { 
     this.name = name; 
    } 

} 

application.properties

spring.datasource.url=jdbc:derby://localhost:1527/db 
spring.datasource.driverClassName=org.apache.derby.jdbc.ClientDriver 

logging.level.org.springframework.web:DEBUG 
logging.level.org.hibernate:DEBUG 

pom.xml

<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.nomad.dubbed</groupId> 
    <artifactId>spring-boot-mvc</artifactId> 
    <version>0.0.1-SNAPSHOT</version> 


    <properties> 
     <derby-client.version>10.11.1.1</derby-client.version> 
    </properties> 

    <parent> 
     <groupId>org.springframework.boot</groupId> 
     <artifactId>spring-boot-starter-parent</artifactId> 
     <version>1.3.3.RELEASE</version> 
     <relativePath /> 
    </parent> 
    <dependencies> 
     <dependency> 
      <groupId>org.springframework.boot</groupId> 
      <artifactId>spring-boot-starter</artifactId> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework.boot</groupId> 
      <artifactId>spring-boot-starter-web</artifactId> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework.boot</groupId> 
      <artifactId>spring-boot-starter-actuator</artifactId> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework.boot</groupId> 
      <artifactId>spring-boot-starter-remote-shell</artifactId> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework.boot</groupId> 
      <artifactId>spring-boot-starter-data-jpa</artifactId> 
     </dependency> 

     <dependency> 
      <groupId>org.apache.derby</groupId> 
      <artifactId>derbyclient</artifactId> 
      <version>${derby-client.version}</version> 
     </dependency> 

     <dependency> 
      <groupId>junit</groupId> 
      <artifactId>junit</artifactId> 
      <scope>test</scope> 
     </dependency> 
    </dependencies> 
    <build> 
     <finalName>spring-boot-mvc</finalName> 
     <plugins> 
      <plugin> 
       <groupId>org.springframework.boot</groupId> 
       <artifactId>spring-boot-maven-plugin</artifactId> 
      </plugin> 
     </plugins> 
    </build> 

</project> 

Database è installato e funzionante, ci sono 5 ro ws nel cerchio tabella:

L'URI di default (/ fagioli,/salute ..) funziona bene, ma il controller implementato non viene riconosciuto. Non c'è alcun errore di tale visualizzazione nella console, sotto è il dump di registri stampati in console dopo che ho inviato la richiesta.

2016-05-03 14:17:26.594 DEBUG 659 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet  : DispatcherServlet with name 'dispatcherServlet' processing GET request for [/] 
2016-05-03 14:17:26.596 DEBUG 659 --- [nio-8080-exec-3] s.w.s.m.m.a.RequestMappingHandlerMapping : Looking up handler method for path/
2016-05-03 14:17:26.596 DEBUG 659 --- [nio-8080-exec-3] s.w.s.m.m.a.RequestMappingHandlerMapping : Did not find handler method for [/] 
2016-05-03 14:17:26.597 DEBUG 659 --- [nio-8080-exec-3] o.s.w.s.handler.SimpleUrlHandlerMapping : Matching patterns for request [/] are [/**] 
2016-05-03 14:17:26.597 DEBUG 659 --- [nio-8080-exec-3] o.s.w.s.handler.SimpleUrlHandlerMapping : URI Template variables for request [/] are {} 
2016-05-03 14:17:26.597 DEBUG 659 --- [nio-8080-exec-3] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapping [/] to HandlerExecutionChain with handler [ResourceHttpRequestHandler [locations=[ServletContext resource [/], class path resource [META-INF/resources/], class path resource [resources/], class path resource [static/], class path resource [public/]], resolvers=[org.springframework.web.servlet.resource.PathResourceResolver@6c13019c]]] and 1 interceptor 
2016-05-03 14:17:26.597 DEBUG 659 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet  : Last-Modified value for [/] is: -1 
2016-05-03 14:17:26.597 DEBUG 659 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet  : Null ModelAndView returned to DispatcherServlet with name 'dispatcherServlet': assuming HandlerAdapter completed request handling 
2016-05-03 14:17:26.597 DEBUG 659 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet  : Successfully completed request 
2016-05-03 14:17:26.597 DEBUG 659 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet  : DispatcherServlet with name 'dispatcherServlet' processing GET request for [/error] 
2016-05-03 14:17:26.600 DEBUG 659 --- [nio-8080-exec-3] s.w.s.m.m.a.RequestMappingHandlerMapping : Looking up handler method for path /error 
2016-05-03 14:17:26.600 DEBUG 659 --- [nio-8080-exec-3] s.w.s.m.m.a.RequestMappingHandlerMapping : Returning handler method [public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)] 
2016-05-03 14:17:26.600 DEBUG 659 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet  : Last-Modified value for [/error] is: -1 
2016-05-03 14:17:26.601 DEBUG 659 --- [nio-8080-exec-3] o.s.w.s.v.ContentNegotiatingViewResolver : Requested media types are [text/html, text/html;q=0.8] based on Accept header types and producible media types [text/html]) 
2016-05-03 14:17:26.601 DEBUG 659 --- [nio-8080-exec-3] o.s.w.s.v.ContentNegotiatingViewResolver : Returning [org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$SpelView@2f5f8d71] based on requested media type 'text/html' 
2016-05-03 14:17:26.601 DEBUG 659 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet  : Rendering view [org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$SpelView@2f5f8d71] in DispatcherServlet with name 'dispatcherServlet' 
2016-05-03 14:17:26.601 DEBUG 659 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet  : Successfully completed request 

Answer 1

utilizzare un URL diverso per il controller. "/" in spring-boot esegue il mapping alle risorse statiche situate in META-INF/resources e src/main/resources/static /.

edit: dimenticare sopra e effettuare le seguenti operazioni nella classe di applicazione:

Application.java

package com.nomad.dubbed.app; 

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

@SpringBootApplication 
@ComponentScan("com.nomad.dubbed") 
public class Application { 

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

} 

il controller resto non viene scoperto dalla primavera-boots di scansione dei componenti. in base al documento http://docs.spring.io/spring-boot/docs/current/reference/html/ ... Spring analizza i pacchetti sotto il pacchetto in cui risiede la classe con l'annotazione @SpringBootApplication. il controller si trova in un pacchetto parallelo.

Answer 2

Potrebbe provare ad aggiungere l'annotazione @ResponseBody

@RequestMapping(method=RequestMethod.GET) 
@ResponseBody 
    public List<Circle> getAll() { 
     return circleService.getAll(); 
    } 

Answer 3

Devo cercare di più perché spring - boot non è riuscito a riconoscere il controller con la struttura del pacchetto originale. Ho scaricato tutte le classi Java in un unico pacchetto e finalmente ho avviato il progetto demo.

Modificato Struttura Java del progetto:

La classe CircleController.java è stato inoltre modificato. Ho tutti i record cancellati dalla tabella circolare senza menzionare il metodo di richiesta specifico, method=RequestMethod.GET.

package com.nomad.dubbed.app; 

import java.util.List; 

import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RequestMethod; 
import org.springframework.web.bind.annotation.RestController; 

@RestController 
public class CircleController { 
    @Autowired 
    private CircleService circleService; 

    @RequestMapping(value="/circles", method=RequestMethod.GET) 
    public List<Circle> getAll() { 
     return circleService.getAll(); 
    } 

} 

Answer 4

Ho avuto lo stesso problema e ho aggiunto @ComponentScan (basePackages = "package.name") nella classe Application. Successivamente è stato riconosciuto il mio controller di riposo.

pacchetto com.nomad.dubbed.app;

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

@SpringBootApplication 
@ComponentScan(basePackages = "com.spring.basepkg") 
public class Application { 

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

}