Myujth

I'm trying to attach a file to send to and endpoint as a MultipartFile but I'm getting this exception:

Expected no exception to be thrown, but got 'feign.codec.EncodeException'
//...
Caused by: feign.codec.EncodeException: Could not write request: 
no suitable HttpMessageConverter found for request type [java.util.LinkedHashMap] 
and content type [multipart/form-data]

My method is:

//...
final User user
//...
@Override
DocumentResponse attachDocument(File file, String userId, String documentId) 

 String timestamp = String.valueOf(System.currentTimeMillis())
 String url = "$myProperties.apiUrl/documents/attach?ts=$timestamp"
 String digest = myJWT.sign(HttpMethod.POST, url)

 MultipartFile multiFile = new MockMultipartFile("test.xml", 
 new FileInputStream(file))

 DocumentResponse documentResponse = user.attachDocument(multiFile, 
 userId, documentId, timestamp, digest)

 return documentResponse

My interface is:

@FeignClient(name = 'myUser', url = '$apiUrl', configuration = myConfiguration)
interface User 

 //...

 @PostMapping(value = '/documents/attach', consumes = 'multipart/form-data')
 DocumentResponse attachDocument(@PathVariable('file') MultipartFile multiFile,
 @PathVariable('clientId') String userId,
 @PathVariable('documentId') String documentId,
 @RequestParam('ts') String timestamp,
 @RequestParam('digest') String digest)

And my configuration file is:

@Slf4j
@Configuration
class myConfiguration 

 @Bean
 Retryer feignRetryer(@Value('$feign.client.config.myUser.period') Long period,
 @Value('$feign.client.config.myUser.maxInterval') Long maxInterval,
 @Value('$feign.client.config.myUser.maxAttempts') Integer maxAttempts) 
 return new Retryer.Default(period, maxInterval, maxAttempts)
 

 @Bean
 ErrorDecoder errorDecoder() 
 return new ErrorDecoder() 
 @Override
 Exception decode(String methodKey, Response response) 
 if (HttpStatus.OK.value() != response.status()) 
 FeignException ex = FeignException.errorStatus(methodKey, response)
 if (response.status() != HttpStatus.BAD_REQUEST.value()) 
 return new RetryableException('getting conflict and retry', new Date(System.currentTimeMillis() + TimeUnit.SECONDS
 .toMillis(1)))
 
 return new MyDocumentException()
 
 
 
 

Also, I have tried to add this code to myConfiguration file:

@Bean
Encoder encoder() 
 return new FormEncoder()

But I have another exception:

Cannot cast object 'feign.form.FormEncoder@5fa78e0a' 
with class 'feign.form.FormEncoder' to class 'java.beans.Encoder'

I'm using Spring boot '2.0.2.RELEASE' with:

"io.github.openfeign.form:feign-form:3.4.1",
"io.github.openfeign.form:feign-form-spring:3.4.1",

I checked these posts:

How to send POST request by Spring cloud Feign

no suitable HttpMessageConverter found for response type

Could not write request: no suitable HttpMessageConverter found for request type and content type

Converting file to multipartfile

Any suggestion?

feign.codec.EncodeException raised when a problem occurs encoding a message.
I think the @PathVariable('file') MultipartFile multiFile, can be converted to a base64 sting and pass it to REST API or add an Encoder to MultipartFile