未找到处理程序方法

Posted 2023-02-19

【中文标题】未找到处理程序方法

【英文标题】：Did not find handler method

【发布时间】：2016-12-13 12:51:50

【问题描述】：

我正在尝试调用一个休息端点，但是当我调用它时得到这个信息，导致 UI 中出现 404 错误

2016-08-07 13:43:42.611 DEBUG 27834 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Looking up handler method for path /api/v1/operations
2016-08-07 13:43:42.614 DEBUG 27834 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Did not find handler method for [/api/v1/operations]
2016-08-07 13:43:42.615 DEBUG 27834 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Matching patterns for request [/api/v1/operations] are [/**]
2016-08-07 13:43:42.616 DEBUG 27834 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : URI Template variables for request [/api/v1/operations] are 
2016-08-07 13:43:42.617 DEBUG 27834 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapping [/api/v1/operations] 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@39ead1b7]]] and 1 interceptor

同一个包中有2个不同端点的控制器类

@RestController
public class OperationRetrievalController 

    @Autowired
    OperationRetrievalManager operationRetrievalManager;

    private static Logger logger = Logger.getLogger(OperationRetrievalController.class);

    @RequestMapping("/api/v1/operations")
    public ResponseEntity<List<OperationView>> requestUserOperations() 
        String ssoId = "xxxxxx";
        logger.info("Inside request operationRetrivel Manager +++++++++>>>>>>>>");
        return new ResponseEntity<List<OperationView>>(operationRetrievalManager.retrieveOperations(ssoId), HttpStatus.OK);
    

我在同一个包中有另一个类：

@RestController
public class ComponentRetrievalController 

    @Autowired
    ComponentRetrievalManager componentRetrievalManager;

    @RequestMapping(value = "api/v1/component/sso_id" , method=RequestMethod.GET)
    public ResponseEntity<List<Component>> requestUserComponent(@PathVariable("sso_id") String ssoId) 

        return new ResponseEntity<List<Component>>(componentRetrievalManager.retrieveComponents(ssoId), HttpStatus.OK);
    

这是 Spring Boot 应用程序类：

@SpringBootApplication
@EnableAutoConfiguration
@EnableJpaRepositories(basePackages="com.ge.power.bis.repositories")
@ComponentScan(basePackages="com.ge.power.bis.managers")
public class Application 

    private static Logger logger = Logger.getLogger(Application.class);


    public static void main(String[] args) 


        SpringApplication springApplication = new SpringApplication(Application.class);

        ApplicationContext ctx = springApplication.run(args);

        logger.info("Let's inspect the beans provided by Spring Boot:");
        String[] beanNames = ctx.getBeanDefinitionNames();
        Arrays.sort(beanNames);
        for (String beanName : beanNames)
        
            logger.info(beanName);
               
    

这是我的包的结构

当我删除 Application.java 中的所有注释并只保留 @SpringBootApplication 时，它会出现以下错误：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'componentRetrievalController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.ge.power.bis.managers.ComponentRetrievalManager com.ge.power.bis.controllers.ComponentRetrievalController.componentRetrievalManager; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.ge.power.bis.managers.ComponentRetrievalManager] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: @org.springframework.beans.factory.annotation.Autowired(required=true)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapable

【问题讨论】：

你尝试调用的 url 是什么

localhost:8080/api/v1/operations 在本地作为 Spring Boot 应用程序运行时

ComponentRetrievalController 定义在哪个包中？它应该在com.ge.power.bis.managers 或其子包之一中。

我已将注释更改为 @ComponentScan(basePackages="com.ge.power.bis.* ") 但收到此错误：ans.factory.BeanCreationException: Error Creating bean with name 'componentRetrievalController' : 自动装配依赖注入失败；嵌套异常是 org.springframework.beans.factory.BeanCreationException：无法自动装配字段：com.ge.power.bis.managers.ComponentRetrievalManager com.ge.power.bis.controllers.ComponentRetrievalController.componentRetrievalManager；嵌套异常是 org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of typ

【参考方案1】：

您需要将服务类标记为“可用于制作 bean”，以便 Spring 的组件扫描能够制作 bean 并注入值。

这可以通过@Component注解来完成。正如@sromit 的回答中提到的，添加@Service 注释也可以，因为它已经继承了@Component。 @Repository 和 @Controller 也继承了 @Component 注解。

【参考方案2】：

Impl 类之一缺少@Service