Injecting feign client

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I have an error when I inject feignClient interface in my service. This is a spring boot and spring cloud version that I use:

org.springframework.boot:spring-boot-starter-parent:2.0.6.RELEASE spring cloud version : Finchley.SR2

But when I create a feignclient bean in my class service it works.

Create a customer feign client:

@Component("DepartmentClient")
@FeignClient(name = "DEPARTMENT-SERVICE", url = "http://test")
public interface DepartmentClient {

    @RequestMapping(value = "/department/{departmentId}", method = RequestMethod.GET)
    void findDepartmetById(@PathVariable("departmentId") int departmentId);

}

I inject this feign client in the service like

@Service
public class AgentService {

    Logger logger = LoggerFactory.getLogger(AgentService.class);

    @Autowired
    private AgentRepository agentRepository;

    @Autowired
    private DepartmentClient departmentClient;
....
}

Output

Field departmentClient in ...AgentService required a bean of type '...DepartmentClient' that could not be found.
The injection point has the following annotations:
org.springframework.beans.factory.annotation.Autowired(required=true)
Action:

Consider defining a bean of type .... DepartmentClient' in your configuration.

For Feign Client to work you have to add @EnableFeignClients to the Configuration class or @SpringBootApplication class

@SpringBootApplication
@EnableFeignClients
public class FooMain {  // Your Main class
    public static void main(String[] args) {
        SpringApplication.run(FooMain.class, args);
    }
}

7. Declarative REST Client: Feign, It has pluggable annotation support including Feign annotations and JAX-RS instances as @Primary , so Spring Framework will know which bean to inject. A central concept in Spring Cloud’s Feign support is that of the named client. Each feign client is part of an ensemble of components that work together to contact a remote server on demand, and the ensemble has a name that you give it as an application developer using the @FeignClient annotation.


Have you tried to remove @Component of feign interface ?

Else look at you spring application component-scan, if your interface is not scan the bean will not be created

OpenFeign/feign-cdi: CDI provider for injecting Feign types, Creating clients. Feign CDI uses the normal Feign interfaces for declaring your rest client. You can add additional annotations to your interface to support CDI� Feign, as a client, is an important tool for microservice developers to communicate with other microservices via Rest API. Coding Time Here, we will alter our EmployeeDashboard Service to make it


Adding more details below to the above answer :

In the @FeignClient annotation the String value ("department" above) is an arbitrary client name, which is used to create a Ribbon load balancer. You can also specify a URL using the url attribute (absolute value or just a hostname). The name of the bean in the application context is the fully qualified name of the interface. To specify your own alias value you can use the qualifier value of the @FeignClient annotation.

To make Feign client work, below are the steps we need to do:

1. Changes in the Feign Client : It should be an interface with Feign client annotation

@FeignClient(
  name = "DEPARTMENT-SERVICE",
  configuration = {DepartmentConfiguration.class},
  fallback = DepartmentFallback.class
)
@RequestMapping(
  value = {"${service.apipath.department}"},
  consumes = {"application/json"},
  produces = {"application/json"}
)
public interface DepartmentClient {

  @RequestMapping(value = "/department/{departmentId}", method = 
    RequestMethod.GET)
  void findDepartmetById(@PathVariable("departmentId") int departmentId);

}

2. Changes in the main class :

@EnableFeignClients
@SpringBootApplication
public class DepartmentApplication {
  public static void main(String[] args) {
    SpringApplication.run(DepartmentApplication.class, args);
  }
}

Introduction to Spring Cloud OpenFeign, Feign makes writing web service clients easier with pluggable Then, we declare a Feign client using the @FeignClient annotation:� Feign CDI. Integration for OpenFeign with Java Contexts & Dependency Injection, allowing you to inject your type safe restful interfaces. Adding to your project. Feign CDI is built using Apache Maven. Artifacts are published, though there's only a single artifact at this time.


I had a similar exception, But I already had @EnableFeignClients in my @SpringBootApplication class. still, spring was not able to create clientBean from FeignClient interface.

Turned out I had to provide basePackages value to the annotation. In absence of it, Spring doesn't create the LoadBalanced HTTP client class from @FeignClient Interface.

@EnableFeignClients(basePackages = "com.xxx.xxx")

Maybe because I always keep my ApplicationClass inside a config package and other code parallel to that package.

Error Injecting FeignClient from another Project, feign client inject feign client feignclient is not an annotation type fallback class must implement the interface annotated by feignclient feign client pass� Feign. This component allows you to define an HTTP client with a simple Java interface that you can then inject and use transparently in your code.


Feign Client to Call Another Microservice, To inject feign client into your services class you can use constructor-based dependency injection or as it is in example below. @Service. public� A central concept in Spring Cloud’s Feign support is that of the named client. Each feign client is part of an ensemble of components that work together to contact a remote server on demand, and the ensemble has a name that you give it as an application developer using the @FeignClient annotation.


The Feign Client doesn’t make any conversion of the requests bodies and parameters, but, rather, uses the Encoder and Decoder for that instead. From the application context, we inject


Below is the Feign client implementation. At run-time, product-service will be resolved with a look up in the discovery server. We can have the configurations defined in CustomFeignConfig.java to override the defaults of Feign client such as Decoder, Encoder, Logger, Contract, etc. For now, let us use the default implementations.