no suitable HttpMessageConverter found for response type

Question

Using spring  with this code    List lt HttpMessageConverter lt   gt  gt  messageConverters   restTemplate getMessageConverters    for HttpMessageConverter httpMessageConverter   messageConverters     System out println httpMessageConverter     ResponseEntity lt ProductList gt  productList   restTemplate getForEntity productDataUrl ProductList class     I get   org springframework http converter ByteArrayHttpMessageConverter 34649ee4 org springframework http converter StringHttpMessageConverter 39fba59b org springframework http converter ResourceHttpMessageConverter 383580da org springframework http converter xml SourceHttpMessageConverter 409e850a org springframework http converter support AllEncompassingFormHttpMessageConverter 673074aa org springframework http converter xml Jaxb2RootElementHttpMessageConverter 1e3b79d3 org springframework http converter json MappingJackson2HttpMessageConverter 52bb1b26  org springframework web client RestClientException  Could not extract response  no suitable HttpMessageConverter found for response type  class com mycopmany ProductList  and content type  text html charset UTF-8    The a snippet of the pojo     XmlRootElement name  TheProductList   public class ProductList     XmlElement required   true  name    date   private LocalDate importDate

User · Answer

A refinement of Vadim Zin4uk s answer is just to use the existing GsonHttpMessageConverter class but invoke the setSupportedMediaTypes   setter   For spring boot apps  this results into adding to following to your configuration classes    Bean public GsonHttpMessageConverter gsonHttpMessageConverter Gson gson        GsonHttpMessageConverter converter   new GsonHttpMessageConverter        converter setGson gson       List lt MediaType gt  supportedMediaTypes   converter getSupportedMediaTypes        if    supportedMediaTypes contains TEXT PLAIN             supportedMediaTypes   new ArrayList lt  gt  supportedMediaTypes           supportedMediaTypes add TEXT PLAIN           converter setSupportedMediaTypes supportedMediaTypes             return converter

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You can make up a class  RestTemplateXML  which extends RestTemplate  Then override doExecute URI  HttpMethod  RequestCallback  ResponseExtractor lt T gt    and explicitly get response-headers and set content-type to application xml    Now Spring reads the headers and knows that it is  application xml   It is kind of a hack but it works   public class RestTemplateXML extends RestTemplate       Override   protected  lt T gt  T doExecute URI url  HttpMethod method  RequestCallback requestCallback          ResponseExtractor lt T gt  responseExtractor  throws RestClientException         logger info  RestTemplateXML class getSuperclass   getSimpleName       doExecute   is overridden          Assert notNull url    url  must not be null         Assert notNull method    method  must not be null         ClientHttpResponse response   null       try           ClientHttpRequest request   createRequest url  method           if  requestCallback    null               requestCallback doWithRequest request                     response   request execute                Set ContentType to XML         response getHeaders   setContentType MediaType APPLICATION XML            if   getErrorHandler   hasError response                logResponseStatus method  url  response                     else              handleResponseError method  url  response                     if  responseExtractor    null               return responseExtractor extractData response                     else              return null                        catch  IOException ex            throw new ResourceAccessException  I O error on     method name                     request for       url           ex getMessage    ex               finally           if  response    null               response close                             private void logResponseStatus HttpMethod method  URI url  ClientHttpResponse response         if  logger isDebugEnabled              try              logger debug method name       request for       url       resulted in                      response getRawStatusCode            response getStatusText                             catch  IOException e                  ignore                         private void handleResponseError HttpMethod method  URI url  ClientHttpResponse response  throws IOException        if  logger isWarnEnabled              try              logger warn method name       request for       url       resulted in                      response getRawStatusCode            response getStatusText         invoking error handler                      catch  IOException e                  ignore                       getErrorHandler   handleError response

User · Answer

In addition to all the answers  if you happen to receive in response text html while you ve expected something else  i e  application json   it may suggest that an error occurred on the server side  say 404  and the error page was returned instead of your data   So it happened in my case  Hope it will save somebody s time

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This is not answering the problem but if anyone comes to this question when they stumble upon this exception of no suitable message converter found  here is my problem and solution  In Spring 4 0 9  we were able to send this     JSONObject jsonCredential   new JSONObject        jsonCredential put APPLICATION CREDENTIALS  data        HttpHeaders headers   new HttpHeaders        headers setContentType MediaType APPLICATION JSON    ResponseEntity lt String gt  res   restTemplate exchange myRestUrl   HttpMethod POST request  String class    In Spring 4 3 5 release  we starting seeing errors with the message that converter was not found  The way Convertors work is that if you have it in your classpath  they get registered  Jackson-asl was still in classpath but was not being recognized by spring  We replaced Jackson-asl with faster-xml jackson core  Once we added I could see the converter being registered

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From a Spring point of view  none of the HttpMessageConverter instances registered with the RestTemplate can convert text html content to a ProductList object  The method of interest is HttpMessageConverter canRead Class  MediaType   The implementation for all of the above returns false  including Jaxb2RootElementHttpMessageConverter    Since no HttpMessageConverter can read your HTTP response  processing fails with an exception   If you can control the server response  modify it to set the Content-type to application xml  text xml  or something matching application   xml   If you don t control the server response  you ll need to write and register your own HttpMessageConverter  which can extend the Spring classes  see AbstractXmlHttpMessageConverter and its sub classes  that can read and convert text html

User · Answer

If you can t change server media-type response  you can extend GsonHttpMessageConverter to process additional support types  public class MyGsonHttpMessageConverter extends GsonHttpMessageConverter       public MyGsonHttpMessageConverter             List lt MediaType gt  types   Arrays asList                  new MediaType  text    html   DEFAULT CHARSET                   new MediaType  application    json   DEFAULT CHARSET                   new MediaType  application      json   DEFAULT CHARSET                     super setSupportedMediaTypes types

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Try this   lt dependency gt       lt groupId gt com fasterxml jackson core lt  groupId gt       lt artifactId gt jackson-databind lt  artifactId gt       lt version gt 2 12 1 lt  version gt   lt  dependency gt

User · Answer

If you are using Spring Boot  you might want to make sure you have the Jackson dependency in your classpath  You can do this manually via        lt dependency gt           lt groupId gt com fasterxml jackson core lt  groupId gt           lt artifactId gt jackson-annotations lt  artifactId gt       lt  dependency gt       lt dependency gt           lt groupId gt com fasterxml jackson core lt  groupId gt           lt artifactId gt jackson-core lt  artifactId gt       lt  dependency gt       lt dependency gt           lt groupId gt com fasterxml jackson core lt  groupId gt           lt artifactId gt jackson-databind lt  artifactId gt       lt  dependency gt    Or you can use the web starter    lt dependency gt     lt groupId gt org springframework boot lt  groupId gt     lt artifactId gt spring-boot-starter-web lt  artifactId gt   lt  dependency gt

User · Answer

Or you can use      public void setSupportedMediaTypes List supportedMediaTypes     method which belongs to AbstractHttpMessageConverter lt T gt   to add some ContentTypes you like  This way can let the MappingJackson2HttpMessageConverter canRead   your response  and transform it to your desired Class  which on this case is ProductList Class   and I think this step should hooked up with the Spring Context initializing  for example  by using      implements ApplicationListener

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You could also simply tell your RestTemplate to accept all media types    Bean public RestTemplate restTemplate        final RestTemplate restTemplate   new RestTemplate        List lt HttpMessageConverter lt   gt  gt  messageConverters   new ArrayList lt  gt        MappingJackson2HttpMessageConverter converter   new MappingJackson2HttpMessageConverter       converter setSupportedMediaTypes Collections singletonList MediaType ALL       messageConverters add converter      restTemplate setMessageConverters messageConverters       return restTemplate

[java] no suitable HttpMessageConverter found for response type

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