创建了一个Spring Boot应用程序示例项目，以了解伪装客户端功能，在运行时会出现以下错误。
说明： com.example.demo.RestClient中的字段remoteCallClient需要找不到“ com.example.demo.RemoteCallClient”类型的Bean。 行动： 考虑在您的配置中定义类型为“ com.example.demo.RemoteCallClient”的bean。
我提供了示例项目的完整源代码，但尝试了各种方法，但仍无法解决。
POM.xml
<?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.example</groupId>
<artifactId>mictro-service-3</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>micro-service-3</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-zuul</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-feign -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-feign</artifactId>
<version>1.4.5.RELEASE</version>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
应用程序的主类
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;
@SpringBootApplication
@EnableFeignClients
public class MicroService3Application {
public static void main(String[] args) {
SpringApplication.run(MicroService3Application.class, args);
}
}
假客户
package com.example.demo;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
@FeignClient(url="https://jsonplaceholder.typicode.com/",value="USERS")
public interface RemoteCallClient {
@RequestMapping("users")
public String getUsers();
}
其他控制器
package com.example.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class RestClient {
@Autowired
private RemoteCallClient remoteCallClient;
public String getRemoteClient() {
return remoteCallClient.getUsers();
}
}
日志
2018-07-23 11:22:57.668 INFO 6556 --- [ main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@4efbca5a: startup date [Mon Jul 23 11:22:57 PDT 2018]; root of context hierarchy
2018-07-23 11:22:57.852 INFO 6556 --- [ main] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
2018-07-23 11:22:57.877 INFO 6556 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'configurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$62660f56] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.0.3.RELEASE)
2018-07-23 11:22:58.066 INFO 6556 --- [ main] c.example.demo.MicroService3Application : No active profile set, falling back to default profiles: default
2018-07-23 11:22:58.075 INFO 6556 --- [ main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@6b58b9e9: startup date [Mon Jul 23 11:22:58 PDT 2018]; parent: org.springframework.context.annotation.AnnotationConfigApplicationContext@4efbca5a
2018-07-23 11:22:58.712 INFO 6556 --- [ main] o.s.cloud.context.scope.GenericScope : BeanFactory id=27c00c1a-419a-35b3-9b1b-f3a4f9bbf439
2018-07-23 11:22:58.726 INFO 6556 --- [ main] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
2018-07-23 11:22:58.800 INFO 6556 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$62660f56] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2018-07-23 11:22:58.992 INFO 6556 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-07-23 11:22:59.006 INFO 6556 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-07-23 11:22:59.006 INFO 6556 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.31
2018-07-23 11:22:59.009 INFO 6556 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files\Java\jre1.8.0_92\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Program Files/Java/jre1.8.0_92/bin/server;C:/Program Files/Java/jre1.8.0_92/bin;C:/Program Files/Java/jre1.8.0_92/lib/amd64;C:\ProgramData\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Java\jdk1.8.0_92\bin;C:\Program Files (x86)\Skype\Phone\;C:\apache-tomcat\bin\;F:\apache-maven-3.5.0\bin;;E:\eclipse\oxygen\eclipse;;.]
2018-07-23 11:22:59.165 INFO 6556 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-07-23 11:22:59.165 INFO 6556 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1090 ms
2018-07-23 11:22:59.371 WARN 6556 --- [ost-startStop-1] c.n.c.sources.URLConfigurationSource : No URLs will be polled as dynamic configuration sources.
2018-07-23 11:22:59.371 INFO 6556 --- [ost-startStop-1] c.n.c.sources.URLConfigurationSource : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath.
2018-07-23 11:22:59.379 INFO 6556 --- [ost-startStop-1] c.netflix.config.DynamicPropertyFactory : DynamicPropertyFactory is initialized with configuration sources: com.netflix.config.ConcurrentCompositeConfiguration@156f04f8
2018-07-23 11:23:00.180 INFO 6556 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-07-23 11:23:00.183 INFO 6556 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-07-23 11:23:00.184 INFO 6556 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-07-23 11:23:00.184 INFO 6556 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-07-23 11:23:00.184 INFO 6556 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-07-23 11:23:00.184 INFO 6556 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpTraceFilter' to: [/*]
2018-07-23 11:23:00.184 INFO 6556 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'webMvcMetricsFilter' to: [/*]
2018-07-23 11:23:00.209 WARN 6556 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'restClient': Unsatisfied dependency expressed through field 'remoteCallClient'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.example.demo.RemoteCallClient' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
2018-07-23 11:23:00.210 WARN 6556 --- [ main] o.s.b.f.support.DisposableBeanAdapter : Invocation of destroy method 'close' failed on bean with name 'eurekaRegistration': org.springframework.beans.factory.BeanCreationNotAllowedException: Error creating bean with name 'org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration': Singleton bean creation not allowed while singletons of this factory are in destruction (Do not request a bean from a BeanFactory in a destroy method implementation!)
2018-07-23 11:23:00.212 INFO 6556 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2018-07-23 11:23:00.225 INFO 6556 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2018-07-23 11:23:00.353 ERROR 6556 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
Field remoteCallClient in com.example.demo.RestClient required a bean of type 'com.example.demo.RemoteCallClient' that could not be found.
Action:
Consider defining a bean of type 'com.example.demo.RemoteCallClient' in your configuration.
答案 0 :(得分：4)
在假冒依赖项下使用
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
答案 1 :(得分：2)
对于那些包含Openfeign依赖项并且该依赖项仍然无法自动装配的人。
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
还必须包括@EnableFeignClients配置注释，该注释将扫描@FeignClient接口。否则，这些客户端将被忽略。
@EnableFeignClients
@SpringBootApplication
public class MyApplication {
public static void main(String[] args) {
SpringApplication.run(MyApplication .class, args);
}
}
答案 2 :(得分：1)
确保RemoteCallClient与主应用程序类不在同一个软件包中。如果添加了@ComponentScan（“ package”）
答案 3 :(得分：0)
我正在与类似的问题作斗争。我看到您已经具有spring-cloud-starter-openfeign依赖性。我建议您删除您的POM spring-cloud-starter-feign 1.4.5.RELEASE 中存在的较早的伪装依赖性。如果您的feignClient驻留在其他应用程序中，则将两个应用程序都升级为相似版本。那对我有用。希望它对您有用！
我正在使用 spring-boot-starter-parent 2.1.2发布 Spring-cloud-dependencies Greenwich.RELEASE 并在我的依赖项中包含以下内容
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>