Could not extract response: no suitable HttpMessageConverter found for response type [class com.XXX] and content type [text/plain]

1. 报错

feign.codec.DecodeException: Could not extract response: no suitable HttpMessageConverter found for response type [class com.XXX] and content type [text/plain]
at feign.SynchronousMethodHandler.decode(SynchronousMethodHandler.java:169)
at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:133)
at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:76)
at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:103)``
2、解决方案
2.1

public class ExtMappingJackson2HttpMessageConverter extends MappingJackson2HttpMessageConverter {
    /*解决no suitable HttpMessageConverter found for response type [class com.XXX] and content type [text/plain]*/
    public ExtMappingJackson2HttpMessageConverter(){
        List<MediaType> mediaTypes = new ArrayList<>();
        mediaTypes.add(MediaType.TEXT_PLAIN);
        setSupportedMediaTypes(mediaTypes);// tag6
    }
}

2.2

@Configuration
public class ConfigBean
{
    @Bean
    public Decoder feignDecoder() {
        return new ResponseEntityDecoder(new SpringDecoder(feignHttpMessageConverter()));
    }
    public ObjectFactory<HttpMessageConverters> feignHttpMessageConverter() {
        final HttpMessageConverters httpMessageConverters = new HttpMessageConverters(new ExtMappingJackson2HttpMessageConverter());
        return new ObjectFactory<HttpMessageConverters>() {
            @Override
            public HttpMessageConverters getObject() throws BeansException {
                return httpMessageConverters;
            }
        };
    }

    @Bean
    RestTemplate restTemplate(){
        RestTemplate restTemplate = new RestTemplate();
        restTemplate.getMessageConverters().add(new ExtMappingJackson2HttpMessageConverter());
        return restTemplate;
    }
}