Could not extract response no suitable HttpMessageConverter found for response type

Question

I am new with spring integration and working in spring integration http module for my project requirement   I am sending request from outbound gateway  as a http client  I am trying to initiate a request  to the server  and server should return  me  the message payload with my set values   I am converting object to JSON  using to send to server  I am sending a request to inbound gateway present on the server side from client HttpClientDemo  shown below  For that purpose  I am converting my object into the JSON and then converting to JSON string to object on the client side  performing some simple operation there and sending it back to the client HttpClientDemo  but before this  I am getting exception related to HttpMessageConverter as below   Exception in thread  main  org springframework web client RestClientException  Could not extract response  no suitable HttpMessageConverter found for response type  class com mycompany MyChannel model FFSampleResponseHttp  and content type  text plain charset UTF-8      at org springframework web client HttpMessageConverterExtractor extractData HttpMessageConverterExtractor java 108      at org springframework web client RestTemplate ResponseEntityResponseExtractor extractData RestTemplate java 784      at org springframework web client RestTemplate ResponseEntityResponseExtractor extractData RestTemplate java 769      at org springframework web client RestTemplate doExecute RestTemplate java 549      at org springframework web client RestTemplate execute RestTemplate java 517      at org springframework web client RestTemplate exchange RestTemplate java 462      at org springframework integration http outbound HttpRequestExecutingMessageHandler handleRequestMessage HttpRequestExecutingMessageHandler java 421      at org springframework integration handler AbstractReplyProducingMessageHandler handleMessageInternal AbstractReplyProducingMessageHandler java 170      at org springframework integration handler AbstractMessageHandler handleMessage AbstractMessageHandler java 78      at org springframework integration dispatcher AbstractDispatcher tryOptimizedDispatch AbstractDispatcher java 116      at org springframework integration dispatcher UnicastingDispatcher doDispatch UnicastingDispatcher java 101      at org springframework integration dispatcher UnicastingDispatcher dispatch UnicastingDispatcher java 97      at org springframework integration channel AbstractSubscribablMyChannel doSend AbstractSubscribablMyChannel java 77      at org springframework integration channel AbstractMessagMyChannel send AbstractMessagMyChannel java 255      at org springframework integration channel AbstractMessagMyChannel send AbstractMessagMyChannel java 223      at org springframework messaging core GenericMessagingTemplate doSend GenericMessagingTemplate java 114      at org springframework messaging core GenericMessagingTemplate doSend GenericMessagingTemplate java 44      at org springframework messaging core AbstractMessageSendingTemplate send AbstractMessageSendingTemplate java 93    Please find  Below related code    Client side code  HttpClientDemo java  public class HttpClientDemo        private static Logger logger   Logger getLogger HttpClientDemo class       public static void main String   args            ApplicationContext context   new ClassPathXmlApplicationContext   META-INF spring integration http-outbound-config xml    RequestGateway requestGateway   context getBean  requestGateway   RequestGateway class                   FFSampleRequestHttp FFSampleRequesthttp   new FFSampleRequestHttp            FFSampleRequesthttp setMyChannelID  1            FFSampleRequesthttp setMyNumber  88            FFSampleRequesthttp setReferenceID  9I            FFSampleRequesthttp setTemplateType 1           FFSampleRequesthttp setTimestamp  today            FFSampleResponseHttp  reply   requestGateway FFSampleResponsegatway FFSampleRequesthttp               logger info  Replied with      reply              My Request Gateway is as follows  RequestGateway java  public interface RequestGateway         FFSampleResponseHttp FFSampleResponsegatway FFSampleRequestHttp request        http-outbound-config xml    lt  xml version  1 0  encoding  UTF-8   gt   lt beans xmlns  http   www springframework org schema beans      xmlns xsi  http   www w3 org 2001 XMLSchema-instance      xmlns int  http   www springframework org schema integration      xmlns int-http  http   www springframework org schema integration http      xsi schemaLocation  http   www springframework org schema beans http   www springframework org schema beans spring-beans xsd         http   www springframework org schema integration http   www springframework org schema integration spring-integration xsd         http   www springframework org schema integration http http   www springframework org schema integration http spring-integration-http xsd  gt        lt int gateway id  requestGateway                    service-interface  com mycompany MyChannel Common RequestGateway                   default-request-channel  requestChannel   gt        lt int channel id  requestChannel   gt       lt int channel id  requestChannel1   gt     lt  --    com mycompany MyChannel model FFSampleResponseHttp -- gt        lt int-http outbound-gateway request-channel  requestChannel1  reply-channel  replyChannel1  url  http   localhost 8080 MyChannel prj-1 0 0 BUILD-SNAPSHOT receiveGateway   http-method  POST   extract-request-payload  true  expected-response-type  com mycompany MyChannel model FFSampleResponseHttp   gt       lt int object-to-json-transformer  input-channel  requestChannel  output-channel  requestChannel1  content-type  application json   result-type  STRING   gt         lt bean id  FFSampleRequestHttp  class  com mycompany MyChannel model FFSampleRequestHttp  gt  lt  bean gt     lt  beans gt    Web xml   lt  xml version  1 0  encoding  ISO-8859-1  standalone  no   gt   lt web-app xmlns  http   java sun com xml ns j2ee  xmlns xsi  http   www w3 org 2001 XMLSchema-instance  version  2 4  xsi schemaLocation  http   java sun com xml ns j2ee http   java sun com xml ns j2ee web-app 2 4 xsd  gt     lt servlet gt       lt servlet-name gt MyChannel-http lt  servlet-name gt       lt servlet-class gt org springframework web servlet DispatcherServlet lt  servlet-class gt       lt init-param gt         lt param-name gt contextConfigLocation lt  param-name gt         lt param-value gt  WEB-INF servlet-config xml lt  param-value gt       lt  init-param gt       lt load-on-startup gt 2 lt  load-on-startup gt     lt  servlet gt     lt servlet-mapping gt       lt servlet-name gt MyChannel-http lt  servlet-name gt       lt url-pattern gt  receiveGateway lt  url-pattern gt      lt  servlet-mapping gt         lt welcome-file-list gt           lt welcome-file gt index html lt  welcome-file gt       lt  welcome-file-list gt    lt  web-app gt    servlet-config xml       lt int channel id  receivMyChannel   gt    lt int-http inbound-gateway request-channel  receivMyChannel  path   receiveGateway  supported-methods  POST   gt        lt int service-activator input-channel  receivMyChannel  gt           lt bean class  com mycompany MyChannel serviceImpl FFSampleHttpImpl  gt           lt constructor-arg ref    FFSampleRequestHttp  gt  lt  constructor-arg gt           lt  bean gt           lt  int service-activator gt          lt bean id  FFSampleRequestHttp  class  com mycompany MyChannel model FFSampleRequestHttp  gt  lt  bean gt        lt bean id  FFSampleResponseHttp  class  com mycompany MyChannel model FFSampleResponseHttp  gt  lt  bean gt        lt  beans gt      public class FFSampleHttpImpl       private static org apache log4j Logger log   Logger              getLogger FFSampleImpl class         Autowired     FFSampleRequestHttp request      public FFSampleHttpImpl                public FFSampleHttpImpl FFSampleRequestHttp request            super            this request   request                 public String issueResponseFor String str  throws JsonParseException  JsonMappingException  IOException            ObjectMapper mapper   new ObjectMapper             FFSampleRequestHttp FFSampleRequestHttp   mapper readValue new String str   FFSampleRequestHttp class            FFSampleRequestHttp setReferenceID  Hi My Number             String  strs   new String             strs   mapper writeValueAsString FFSampleRequestHttp                return strs                  FFSampleRequestHttp java  public class FFSampleRequestHttp       protected String MyNumber        protected String referenceID         protected String myChannelID      protected String timestamp      protected int templateType      public String getMyNumber             return MyNumber            public void setMyNumber String MyNumber            this MyNumber   MyNumber            public String getReferenceID             return referenceID            public void setReferenceID String referenceID            this referenceID   referenceID            public String getMyChannelID             return myChannelID            public void setMyChannelID String myChannelID            this myChannelID   myChannelID            public String getTimestamp             return timestamp            public void setTimestamp String timestamp            this timestamp   timestamp            public int getTemplateType             return templateType            public void setTemplateType int templateType            this templateType   templateType                FFSampleResponseHttp java  public class FFSampleResponseHttp       protected String MyNumber      protected String referenceID      protected String myChannelID      protected String timestamp      protected int templateType       public String getMyNumber             return MyNumber            public void setMyNumber String MyNumber            this MyNumber   MyNumber            public String getReferenceID             return referenceID            public void setReferenceID String referenceID            this referenceID   referenceID            public String getMyChannelID             return myChannelID            public void setMyChannelID String myChannelID            this myChannelID   myChannelID            public String getTimestamp             return timestamp            public void setTimestamp String timestamp            this timestamp   timestamp            public int getTemplateType             return templateType            public void setTemplateType int templateType            this templateType   templateType                When I run the above code I get following error    16 55 46 843  main  DEBUG o s web client RestTemplate - Writing    MyNumber   88   referenceID   9I   myChannelID   1   timestamp   today   templateType  1   as  text plain charset UTF-8  using  org springframework http converter StringHttpMessageConverter 7d31a3e2  16 55 46 988  main  DEBUG o s web client RestTemplate - POST request for  http   localhost 8080 MyChannel prj-1 0 0 BUILD-SNAPSHOT receiveGateway  resulted in 200  OK  Exception in thread  main  org springframework web client RestClientException  Could not extract response  no suitable HttpMessageConverter found for response type  class com mycompany MyChannel model FFSampleResponseHttp  and content type  text plain charset UTF-8      at org springframework web client HttpMessageConverterExtractor     I have used spring integration  basic sample code for reference  Please provide your input  I also tried by using the spring object mapper in the configuration files with JSON to object transformer but then also I am getting similer issues for HttpMessageConverter  Please help me with your valuable inputs suggestion and let me know if we have any limitation with spring integration http object mapper     Hi Artem  Thanks for your reply  I am still facing some challenges mentioned below  I have done the changes in my configuration files as per of your suggestion  but facing issue when using Jackson2JsonObjectMapper and need your further help  Please find below issue description   I have done changes in my files and now files are like below  My Servlet-Config xml file content is as below    lt int channel id  channel1    gt    lt int channel id  channel2    gt    lt int channel id  channel3    gt    lt int-http inbound-gateway request-channel  channel1  supported-methods  POST  path   receiveGateway    gt   -  lt int service-activator input-channel  channel2  gt   -  lt bean class  com myCompany myChannel serviceImpl FFSampleHttpImpl  gt    lt constructor-arg ref  ffSampleRequestHttp    gt    lt  bean gt    lt  int service-activator gt     lt int json-to-object-transformer input-channel  channel1  output-channel  channel2  type  com myCompany myChannel model FFSampleRequestHttp  object-mapper  jackson2JsonObjectMapper    gt     lt bean id  jackson2JsonObjectMapper  class  org springframework integration support json Jackson2JsonObjectMapper    gt    lt bean id  ffSampleRequestHttp  class  com myCompany myChannel model FFSampleRequestHttp    gt    lt bean id  ffSampleResponseHttp  class  com myCompany myChannel model FFSampleResponseHttp    gt    lt  beans gt    Out bound file config file which is responsible to sent message to server     lt int gateway id  requestGateway  service-interface  com myCompany myChannel Common RequestGateway  default-request-channel  requestChannel    gt      lt int channel id  requestChannel    gt      lt int channel id  requestChannel1    gt      lt int object-to-json-transformer input-channel  requestChannel  output-channel  requestChannel1  content-type  application json    gt      lt int-http outbound-gateway request-channel  requestChannel1  reply-channel  channel4  url  http   localhost 8080 myChannel prj-1 0 0 BUILD-SNAPSHOT http receiveGateway  http-method  POST    gt      lt bean id  FFSampleRequestHttp  class  com myCompany myChannel model FFSampleRequestHttp    gt      lt int json-to-object-transformer input-channel  channel4  output-channel  requestChannel  type  com myCompany myChannel model FFSampleResponseHttp  object-mapper  jackson2JsonObjectMapper    gt      lt bean id  jackson2JsonObjectMapper  class  org springframework integration support json Jackson2JsonObjectMapper    gt      lt  beans gt    My impl class method is as below   public  FfSampleResponseHttp issueResponseFor FfSampleRequestHttp request             FfSampleResponseHttp ffSampleResponse2   new FfSampleResponseHttp             ffSampleResponse2 setCifNumber  Yappi I am in the method            log info  issueResponseFor FfSampleRequesthttp request              return ffSampleResponse2           I am able to call my service method issueResponseFor present in server side from the client but when this is processing further   Caused by  java lang IllegalArgumentException   json  argument must be an instance of   class java lang String  class  B  class java io File  class java net URL  class java io InputStream  class java io Reader         at org springframework integration support json Jackson2JsonObjectMapper fromJson Jackson2JsonObjectMapper java 93         at org springframework integration support json Jackson2JsonObjectMapper fromJson Jackson2JsonObjectMapper java 44         at org springframework integration support json AbstractJacksonJsonObjectMapper fromJson AbstractJacksonJsonObjectMapper java 55         at org springframework integration json JsonToObjectTransformer doTransform JsonToObjectTransformer java 78         at org springframework integration transformer AbstractTransformer transform AbstractTransformer java 33             54 more   I have verified while debugging that the payload body while in response is coming blank in json object in the parameter of Jackson2JsonObjectMapper fromJson      after roaming through my service method successfully  I am not able to understand where am I doing the mistake  Please provide your help input  Again let me know if I am again missing something in my config files  Thank you very much for your support

User · Answer

Here is a simple solution

try adding this dependency

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.8.3</version>
</dependency>

User · Answer

Since you return to the client just String and its content type     text plain   there is no any chance for default converters to determine how to convert String response to the FFSampleResponseHttp object   The simple way to fix it    remove expected-response-type from  lt int-http outbound-gateway gt  add to the replyChannel1  lt json-to-object-transformer gt    Otherwise you should write your own HttpMessageConverter to convert the String to the appropriate object   To make it work with MappingJackson2HttpMessageConverter  one of default converters  and your expected-response-type  you should send your reply with content type    application json    If there is a need  just add  lt header-enricher gt  after your  lt service-activator gt  and before sending a reply to the  lt int-http inbound-gateway gt    So  it s up to you which solution to select  but your current state doesn t work  because of inconsistency with default configuration   UPDATE  OK  Since you changed your server to return FfSampleResponseHttp object as HTTP response  not String  just add contentType    application json  header before sending the response for the HTTP and MappingJackson2HttpMessageConverter will do the stuff for you - your object will be converted to JSON and with correct contentType header   From client side you should come back to the expected-response-type  com mycompany MyChannel model FFSampleResponseHttp  and MappingJackson2HttpMessageConverter should do the stuff for you again   Of course you should remove  lt json-to-object-transformer gt  from you message flow after  lt int-http outbound-gateway gt

User · Answer

public class Application        private static List lt HttpMessageConverter lt   gt  gt  getMessageConverters             List lt HttpMessageConverter lt   gt  gt  converters   new ArrayList lt HttpMessageConverter lt   gt  gt             converters add new MappingJacksonHttpMessageConverter             return converters                public static void main String   args            RestTemplate restTemplate   new RestTemplate             restTemplate setMessageConverters getMessageConverters             HttpHeaders headers   new HttpHeaders            headers setAccept Arrays asList MediaType APPLICATION JSON            HttpEntity lt String gt  entity   new HttpEntity lt String gt  headers             Page page   restTemplate getForObject  http   graph facebook com pivotalsoftware   Page class            ResponseEntity lt Page gt  response                      restTemplate exchange  http   graph facebook com skbh86   HttpMethod GET  entity  Page class   1            Page page   response getBody            System out println  Name         page getId             System out println  About        page getFirst name             System out println  Phone        page getLast name             System out println  Website      page getMiddle name             System out println  Website      page getName

User · Answer

As Artem Bilan said  this problem occures because MappingJackson2HttpMessageConverter supports response with application json content-type only  If you can t change server code  but can change client code I had such case   you can change content-type header with interceptor   restTemplate getInterceptors   add  request  body  execution  - gt                ClientHttpResponse response   execution execute request body               response getHeaders   setContentType MediaType APPLICATION JSON               return response

[spring] Could not extract response: no suitable HttpMessageConverter found for response type

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