Tag Archives: Feign error

[Solved] Feign Error: -‘oauth-client.FeignClientSpecification‘ could not be registered

environment

<spring-boot.version>2.5.3</spring-boot.version>
<spring-cloud.version>2020.0.3</spring-cloud.version>
<spring-cloud-alibaba.version>2021.1</spring-cloud-alibaba.version>

report errors

Errors are reported during project startup, as follows:

2021-12-22 16:55:56.766  WARN 21922 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.support.BeanDefinitionOverrideException: Invalid bean definition with name 'oauth-client.FeignClientSpecification' defined in null: Cannot register bean definition [Generic bean: class [org.springframework.cloud.openfeign.FeignClientSpecification]; scope=; abstract=false; lazyInit=null; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null] for bean 'oauth-client.FeignClientSpecification': There is already [Generic bean: class [org.springframework.cloud.openfeign.FeignClientSpecification]; scope=; abstract=false; lazyInit=null; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null] bound.
2021-12-22 16:55:56.776  INFO 21922 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-12-22 16:55:56.799 ERROR 21922 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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

Description:

The bean 'xxx-client.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

reason

Multiple interfaces in a project use @ feignclient to call the same service, which means that a service can only be used once with @ feignclient.

Solution:

1) Distinguish with ContextID

But I don’t know why it didn’t work

@FeignClient(value = “xxx-server”, contextId = “oauth-client”)
public interface OAuthClientFeignClient {
@GetMapping("/api/v1/oauth-clients/{clientId}")
Result<SysOauthClient> getOAuthClientById(@PathVariable String clientId);
}

2) Add the following code to the application.properties file.

#Allow the existence of multiple Feign calls to the same Service interface
spring.main.allow-bean-definition-overriding=true

3) Add the following code to the application.yml file.

spring:
  main:
    #Allow the existence of multiple Feign calls to the same Service interface
    allow-bean-definition-overriding: true
        The above code enables multiple interfaces to call the same service using @FeignClient.

Feign declarative call service feign.codec.DecodeException: Error while extracting response for type [class **] and…

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A few days ago, when I was working on a project, I encountered a garbled return from the feign call, which caused a program error. The reason is that the dependency version of cloud is too low, and feign does not support gzip decoding. Without upgrading the jar, a filter was added.

 

code show as below:

public class FeignResponseDecoder implements Decoder {
    private final Decoder delegate;
 
    public FeignResponseDecoder(Decoder delegate) {
        Objects.requireNonNull(delegate, "Decoder must not be null. ");
        this.delegate = delegate;
    }
 
    @Override
    public Object decode(Response response, Type type) throws IOException {
        Collection<String> values = response.headers().get(HttpEncoding.CONTENT_ENCODING_HEADER);
        if (Objects.nonNull(values) && !values.isEmpty() && values.contains(HttpEncoding.GZIP_ENCODING)) {
            byte[] compressed = Util.toByteArray(response.body().asInputStream());
            if ((compressed == null) || (compressed.length == 0)) {
                return delegate.decode(response, type);
            }
            //decompression part
            //after decompress we are delegating the decompressed response to default
            //decoder
            if (isCompressed(compressed)) {
                final StringBuilder output = new StringBuilder();
                final GZIPInputStream gis = new GZIPInputStream(new ByteArrayInputStream(compressed));
                final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(gis, StandardCharsets.UTF_8));
                String line;
                while ((line = bufferedReader.readLine()) != null) {
                    output.append(line);
                }
                Response uncompressedResponse = response.toBuilder().body(output.toString().getBytes()).build();
                return delegate.decode(uncompressedResponse, type);
            } else {
                return delegate.decode(response, type);
            }
        } else {
            return delegate.decode(response, type);
        }
    }
 
    private static boolean isCompressed(final byte[] compressed) {
        return (compressed[0] == (byte) (GZIPInputStream.GZIP_MAGIC)) && (compressed[1] == (byte) (GZIPInputStream.GZIP_MAGIC >> 8));
    }
}

 

Then inject this class as a bean:

@Bean
public Decoder GZIPResponseDecoder(ObjectFactory<HttpMessageConverters> messageConverters) {
    Decoder decoder = new FeignResponseDecoder(new SpringDecoder(messageConverters));
    return decoder;
}