'The bean 'exampleService.FeignClientSpecification' could not be registered. Bean already defined and overriding is disabled

My feign client class is as below along with the Application class.

@FeignClient(name = "ExampleService", configuration = FeignClientConfig.class, url = "http://localhost:8091")
public interface ExampleClient {
  @GetMapping(value = "exampleService/exampleDetails/{id}")
  public List<ExampleDTO> getExampleDetails(@PathVariable(name = "id") final Long id);
}

@EnableAutoConfiguration
@EnableScheduling
@SpringBootApplication
@EnableFeignClients(basePackages = {"com.package.example"})
@ComponentScan(basePackages = {"com.package"})
public class ExampleApplication extends SpringBootServletInitializer {
  public static void main(String[] args) {
    SpringApplication.run(ExampleApplication.class, args);
  }
}

In the above code I'm getting the error as given below 

APPLICATION FAILED TO START

Description:
The bean 'ExampleService.FeignClientSpecification' could not be registered. A bean with that name has already been defined and overriding is disabled.

Action: 
Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding = true

First of all, there's only 1 feign client by that name being defined in the project. Second I tried giving it a context ID just in case there was a bean with the same name being defined somewhere I must've missed.

@FeignClient(contextId = "myExampleService", name="ExampleService", configuration = FeignClientConfig.class, url = "http://localhost:8091")

but again it gave me the same error 

The bean 'myExampleService.FeignClientSpecification' could not be registered. A bean with that name has already been defined and overriding is disabled.

Third, I also tried by giving the property in application.properties file for overriding the bean 

spring.main.allow-bean-definition-overriding = true

but still I'm getting the same error. Any reason why I'm getting this issue even though there is only 1 bean with the name available for Spring's app context?

javaspringspring-bootspring-cloud-feign


Solution 1:[1]

It might not be the OP's problem since he has only one feign client, but to anyone that got here by googling the same error:

The name attribute of the @FeignClient annotation works as a unique identifier to the client. If you want to have multiple feign clients within the same Spring context, each needs to have a unique name (or value, as these two attributes are aliases to each other)

For instance:

@RequestMapping(value="/endpoint/path")
@FeignClient(name = "MUST-BE-UNIQUE")
public interface MyClient {
}

Solution 2:[2]

This can also happen if you have more than 1 @FeignClients defined with the same name: Link

Giving unique names in my clients fixed it for me

Solution 3:[3]

I had this same problem.

For me it was a maven issue, it seemed like 2 copies of the same library were being used (not because of a real problem but because maven had "got confused". I had been maven installing local builds of a library).

I resolved the problem by deleting my C:\Users{user}.m2\repository and then reimporting the project

Solution 4:[4]

Try deleting FeignClient interface(ExampleClient) from your test package and run the test case and I hope it should work now.

Sources

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Source: Stack Overflow

Solution Source
Solution 1
Solution 2 Grim
Solution 3 Richard Tingle
Solution 4 Rajesh

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