不能在春季启动

Question

 
2017-03-16 16:09:08.821 INFO 9104 --- [   main] com.hello.EurekaClientApplication  : No active profile set, falling back to default profiles: default 
2017-03-16 16:09:08.848 INFO 9104 --- [   main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@5dcd8c7a: startup date [Thu Mar 16 16:09:08 CDT 2017]; parent: org.springframework.context.annotation.AnnotationConfigApplicationContext@441772e 
2017-03-16 16:09:09.873 INFO 9104 --- [   main] o.s.b.f.s.DefaultListableBeanFactory  : Overriding bean definition for bean 'hystrixFeature' 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.cloud.netflix.hystrix.HystrixCircuitBreakerConfiguration$HystrixWebConfiguration; factoryMethodName=hystrixFeature; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/cloud/netflix/hystrix/HystrixCircuitBreakerConfiguration$HystrixWebConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.cloud.netflix.hystrix.HystrixCircuitBreakerConfiguration; factoryMethodName=hystrixFeature; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/cloud/netflix/hystrix/HystrixCircuitBreakerConfiguration.class]] 
2017-03-16 16:09:10.364 WARN 9104 --- [   main] o.s.c.a.ConfigurationClassPostProcessor : Cannot enhance @Configuration bean definition 'refreshScope' since its singleton instance has been created too early. The typical cause is a non-static @Bean method with a BeanDefinitionRegistryPostProcessor return type: Consider declaring such methods as 'static'. 
2017-03-16 16:09:10.701 INFO 9104 --- [   main] o.s.cloud.context.scope.GenericScope  : BeanFactory id=d0eb8cfd-bd5b-3565-9f63-f671e896f6be 
2017-03-16 16:09:10.736 INFO 9104 --- [   main] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring 
2017-03-16 16:09:11.312 INFO 9104 --- [   main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$94394ff6] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 
2017-03-16 16:09:12.091 INFO 9104 --- [   main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http) 
2017-03-16 16:09:12.128 INFO 9104 --- [   main] o.apache.catalina.core.StandardService : Starting service Tomcat 
2017-03-16 16:09:12.130 INFO 9104 --- [   main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.11 
2017-03-16 16:09:12.546 INFO 9104 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]  : Initializing Spring embedded WebApplicationContext 
2017-03-16 16:09:12.547 INFO 9104 --- [ost-startStop-1] o.s.web.context.ContextLoader   : Root WebApplicationContext: initialization completed in 3699 ms 
2017-03-16 16:09:13.191 INFO 9104 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'proxyStreamServlet' to [/proxy.stream] 
2017-03-16 16:09:13.193 INFO 9104 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/] 
2017-03-16 16:09:13.198 INFO 9104 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'metricsFilter' to: [/*] 
2017-03-16 16:09:13.199 INFO 9104 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*] 
2017-03-16 16:09:13.199 INFO 9104 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*] 
2017-03-16 16:09:13.200 INFO 9104 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*] 
2017-03-16 16:09:13.200 INFO 9104 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*] 
2017-03-16 16:09:13.200 INFO 9104 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'webRequestLoggingFilter' to: [/*] 
2017-03-16 16:09:13.200 INFO 9104 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'applicationContextIdFilter' to: [/*] 
2017-03-16 16:09:13.269 WARN 9104 --- [   main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'eurekaClientApplication': Unsatisfied dependency expressed through field 'clientservice'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'clientService' defined in file [C:\Users\Mike\workspace\Eureka_client\target\classes\com\hello\ClientService.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.netflix.discovery.DiscoveryClient' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {} 
2017-03-16 16:09:13.306 INFO 9104 --- [   main] o.apache.catalina.core.StandardService : Stopping service Tomcat 
2017-03-16 16:09:13.404 INFO 9104 --- [   main] utoConfigurationReportLoggingInitializer : 

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled. 
2017-03-16 16:09:13.745 ERROR 9104 --- [   main] o.s.b.d.LoggingFailureAnalysisReporter : 

*************************** 
APPLICATION FAILED TO START 
*************************** 

Description: 

Parameter 0 of constructor in com.hello.ClientService required a bean of type 'com.netflix.discovery.DiscoveryClient' that could not be found. 


Action: 

Consider defining a bean of type 'com.netflix.discovery.DiscoveryClient' in your configuration. 

package com.hello; 

import org.springframework.cloud.client.discovery.EnableDiscoveryClient; 
import org.springframework.stereotype.Service; 
import com.netflix.discovery.DiscoveryClient; 
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand; 

@EnableDiscoveryClient 
@Service 
public class ClientService { 

private final DiscoveryClient disc; 

    public ClientService(DiscoveryClient disc){ 
     this.disc=disc; 
    } 



    @HystrixCommand(fallbackMethod="disp") 
    public String serviceInstancesByApplicationName(){ 
     return this.disc.getInstancesById("a-bootiful-client").toString(); 
    } 

    public String disp(){ 
     return "This is fall back method"; 
    } 
} 




package com.hello; 

import java.util.List; 

import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.boot.SpringApplication; 
import org.springframework.boot.SpringBootConfiguration; 
import org.springframework.boot.autoconfigure.EnableAutoConfiguration; 
import org.springframework.boot.autoconfigure.SpringBootApplication; 
import org.springframework.boot.web.client.RestTemplateBuilder; 
import org.springframework.cloud.client.ServiceInstance; 
import org.springframework.cloud.client.discovery.DiscoveryClient; 
import org.springframework.cloud.client.discovery.EnableDiscoveryClient; 
import org.springframework.cloud.netflix.hystrix.EnableHystrix; 
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard; 
import org.springframework.context.annotation.Bean; 
import org.springframework.context.annotation.ComponentScan; 
import org.springframework.web.bind.annotation.PathVariable; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RestController; 
import org.springframework.web.client.RestTemplate; 

import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand; 


@EnableHystrix 
@EnableHystrixDashboard 
@EnableDiscoveryClient 
@SpringBootConfiguration 
@EnableAutoConfiguration 
@ComponentScan 
@RestController 
public class EurekaClientApplication { 


    @Autowired 
    private ClientService clientservice; 




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

    @RequestMapping("/serv") 
    public String serviceInstancesByApplicationName(){ 
     return clientservice.serviceInstancesByApplicationName(); 
    } 
} 

我试图创建一个简单的灵光服务和客户端程序和，使椎找到DiscoveryClient豆错误。但我在代码上得到这个错误

Answer 1

您在代码中导入了错误的DiscoveryClient类。 netflix中的DiscoveryClient不作为Spring Bean提供。所以你应该从春天开始。

尝试导入org.springframework.cloud.client.discovery.DiscoveryClient而不是com.netflix.discovery.DiscoveryClient在您的ClientService类。您也可以将this.disc.getInstancesById("a-bootiful-client")更改为this.disc.getInstances(...)。