Spring MVC - HttpMediaTypeNotAcceptableException

Question

I keep getting this HttpMediaTypeNotAcceptableException error for AJAX requests when using with Spring MVC and JSON   full stack trace of the error is      org springframework web HttpMediaTypeNotAcceptableException  Could not find acceptable representation org springframework web servlet mvc annotation AnnotationMethodHandlerAdapter ServletHandlerMethodInvoker writeWithMessageConverters AnnotationMethodHandlerAdapter java 1032  org springframework web servlet mvc annotation AnnotationMethodHandlerAdapter ServletHandlerMethodInvoker handleResponseBody AnnotationMethodHandlerAdapter java 972  org springframework web servlet mvc annotation AnnotationMethodHandlerAdapter ServletHandlerMethodInvoker getModelAndView AnnotationMethodHandlerAdapter java 921  org springframework web servlet mvc annotation AnnotationMethodHandlerAdapter invokeHandlerMethod AnnotationMethodHandlerAdapter java 438  org springframework web servlet mvc annotation AnnotationMethodHandlerAdapter handle AnnotationMethodHandlerAdapter java 424  org springframework web servlet DispatcherServlet doDispatch DispatcherServlet java 863  org springframework web servlet DispatcherServlet doService DispatcherServlet java 792  org springframework web servlet FrameworkServlet processRequest FrameworkServlet java 851  org springframework web servlet FrameworkServlet doGet FrameworkServlet java 756  javax servlet http HttpServlet service HttpServlet java 617  javax servlet http HttpServlet service HttpServlet java 717    little googling I did shows that the request should contain something like  accept  application json  which is does have   here is the request headers from firebug    Response Headers Server  Apache-Coyote 1 1 Content-Type    text html charset utf-8 Content-Length  2503 Date    Thu  25 Aug 2011 21 00 05 GMT Connection  close  Request Headers Host    localhost 8080 User-Agent  Mozilla 5 0  Windows  U  Windows NT 5 1  en-US  rv 1 9 2 20  Gecko 20110803 Firefox 3 6 20   NET CLR 3 5 30729  Accept  application json  text javascript       q 0 01 Accept-Language en-us en q 0 5 Accept-Encoding gzip deflate Accept-Charset  ISO-8859-1 utf-8 q 0 7   q 0 7 Keep-Alive  115 Connection  keep-alive X-Requested-With    XMLHttpRequest Referer http   localhost 8080 legaldirectory index html Cookie  JSESSIONID 5C97DA19AED4D5FA17F4A58470FAA93B   Now I am completely lost at what is happening here   what else can go wrong here to get thi error

User · Answer

From  http   georgovassilis blogspot ca 2015 10 spring-mvc-rest-controller-says-406 html  You ve got this Spring  RestController and mapped a URL that contains an email as part of the URL path  You cunningly worked around the dot truncation issue  1  and you are ready to roll  And suddenly  on some URLs  Spring will return a 406  2  which says that the browser requested a certain content type and Spring can t serialize the response to that content type  The point is  you ve been doing Spring applications for years and you did all the MVC declarations right and you included Jackson and basically you are stuck  Even worse  it will spit that error out only on some emails in the URL path  most notably those ending in a   com  domain    RequestMapping value     agenda  email       method   RequestMethod GET  public List lt AgendaEntryDTO gt  checkAgenda  PathVariable  email   String email    The issue  3  is quite tricky  the application server performs some content negotiation and convinces Spring that the browser requested a  application x-msdownload  content  despite that occurring nowhere in the request the browser actually submitted   The solution is to specify a content negotiation manager for the web application context    lt mvc annotation-driven enable-matrix-variables  true      content-negotiation-manager  contentNegotiationManager    gt   lt bean id  contentNegotiationManager      class  org springframework web accept ContentNegotiationManagerFactoryBean  gt       lt property name  defaultContentType  value  application json    gt       lt property name  favorPathExtension  value  false    gt       lt property name  favorParameter  value  false    gt       lt property name  parameterName  value  mediaType    gt       lt property name  ignoreAcceptHeader  value  false    gt       lt property name  useJaf  value  false    gt   lt  bean gt

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Because this is the first google hit for  HttpMediaTypeNotAcceptableException  I like to add another problem that I ve stumbled upon which resulted in HttpMediaTypeNotAcceptableException too   In my case it was a controller that specified  produces   e g     RequestMapping path     mypath  filename    method   RequestMethod GET          produces     MediaType APPLICATION XML VALUE     because I wanted to serve an XML file  At the same time I m using a class with   ControllerAdvice  to catch Exceptions  e g  if the requested file wasn t found  The Exception handler was returning JSON so the client  angular  app could display the error message somewhere in the SPA   Now the controller wanted to return XML but the Exception Handler was returning JSON so the HttpMediaTypeNotAcceptableException was raised  I solved this by adding JSON as possible  produces  value   produces     MediaType APPLICATION XML VALUE  MediaType APPLICATION JSON VALUE    Hope this helps somebody else   -

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In my case  just add  ResponseBody annotation to solve this issue

User · Answer

Try to add  jackson-databind  jars to pom xml    lt dependency gt       lt groupId gt com fasterxml jackson core lt  groupId gt       lt artifactId gt jackson-databind lt  artifactId gt       lt version gt   jackson databind-version  lt  version gt   lt  dependency gt     And produces   MediaType APPLICATION JSON VALUE  MediaType APPLICATION XML VALUE  to   RequestMapping  Es   RequestMapping value     api xxx  akey   md5    produces   MediaType APPLICATION JSON VALUE  MediaType APPLICATION XML VALUE   RequestMapping value     api contrassegno  akey   md5    produces   MediaType APPLICATION JSON VALUE  MediaType APPLICATION XML VALUE

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Just something important to keep in mind  Spring versions prior to 3 1 2 are compatible with JACKSON 1 x and NOT with JACKSON 2 x  This is because going from JACKSON 1 x to 2 x the classes s package names were changed  In JACKSON 1 x classes are under org codehaus jackson while in JACKSON 2 x they are under com fasterxml jackson   To address this issue  starting with Spring 3 1 2 they added a new MappingJackson2HttpMessageConverter to replace MappingJacksonHttpMessageConverter   You could find more details regarding compatibility issues in this link  Jackson annotations being ignored in Spring

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Please make sure that you have the following in your Spring xml file    lt context annotation-config  gt     lt bean id  jacksonMessageConverter  class  org springframework http converter json MappingJacksonHttpMessageConverter  gt  lt  bean gt    lt bean class  org springframework web servlet mvc annotation AnnotationMethodHandlerAdapter  gt   lt property name  messageConverters  gt     lt list gt       lt ref bean  jacksonMessageConverter   gt     lt  list gt   lt  property gt   lt  bean gt    and all items of your POJO should have getters setters  Hope it helps

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response setHeader  Accept     application json

User · Answer

I had the same issue  but i had figured out that basically what happens when spring is trying to render the response it will try to serialize it according to the media type you have specified and by using getter and setter methods in your class   before my class used to look like below   public class MyRestResponse      private String message      solution looks like below  public class MyRestResponse      private String message      public void setMessage String msg           this message   msg            public String getMessage            return this message            that s how it worked for me

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More of a comment than an answer     I m using Lombok and I was developing a  very  skeleton API and my response DTO didn t have any fields  yet  and I got the HttpMediaTypeNotAcceptableException error while running my integration tests   Adding a field to the response DTO fixed the issue

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For me the problem was the URL I was trying to access  I had url like this     ip     port     path   person html   When you end url with  html it means that you will not accept any other payload than html  I needed to remove  html from the end for my endpoint to work properly   You can also append  json at the end of url and it will work too   Additionally your url-pattern in web xml need to be configured properly to allow you to access the resource  For me it is   lt servlet-mapping gt           lt servlet-name gt spring-mvc lt  servlet-name gt           lt url-pattern gt   lt  url-pattern gt       lt  servlet-mapping gt    Previously I had   html  and it was preventing me an access to the endpoint

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in my case favorPathExtension false  helped me   Configuration public class WebMvcConfiguration extends WebMvcConfigurerAdapter     Override public void configurePathMatch PathMatchConfigurer configurer        configurer              setUseSuffixPatternMatch false       to use special character in path variables  for example   email dom com      Override public void configureContentNegotiation ContentNegotiationConfigurer configurer        configurer              favorPathExtension false      to  avoid HttpMediaTypeNotAcceptableException on standalone tomcat

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Make sure you add both Jackson jars to classpath    jackson-core-asl-x jar jackson-mapper-asl-x jar   Also  you must have the following in your Spring xml file    lt mvc annotation-driven   gt

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In my case      timestamp  1537542856089  status  406  error   Not Acceptable   exception   org springframework web HttpMediaTypeNotAcceptableException   message   Could not find acceptable representation   path    a 101 xml     was caused by   path     path  VariableName   but I was passing in VariableName with a suffix  like  abc xml  which makes it interpret the  xml as some kind of format request instead   See answers there

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As Alex hinted in one of the answers  you could use the ContentNegotiationManagerFactoryBean to set the default content-type to  application json   but I felt that that approach was not for me   What I was trying to do was to post a form to a method like this   RequestMapping value     post to me   method   RequestMethod POST  produces   MediaType APPLICATION JSON VALUE  consumes   MediaType MULTIPART FORM DATA VALUE      public  ResponseBody MyJsonPOJO handlePostForm  Valid  ModelAttribute  form   ValidateMeForm form  BindingResult bindingResult  throws ApiException     What I instead chose to do was to change the  Accept  header of the request from the browser to  application json   thereby making SpringMVC find my method   Using the  not yet finalized  Javascript Fetch API   var form   new FormData    form append  myData    data     let fetchConfig         method   POST       body  form      headers    Accept    application json       fetch   post to me   fetchConfig       then        Javascript Promise API here   Et voil    Now SpringMVC finds the method  validates the form  and lets you return a JSON POJO

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In your Spring  Configuration class which extends WebMvcConfigurerAdapter override the method configureMessageConverters  for instance    Override public void configureMessageConverters List lt HttpMessageConverter lt   gt  gt  converters            http     HttpMessageConverter converter   new StringHttpMessageConverter        converters add converter       logger info  HttpMessageConverter added            string     converter   new FormHttpMessageConverter        converters add converter       logger info  FormHttpMessageConverter added            json     converter   new MappingJackson2HttpMessageConverter        converters add converter       logger info  MappingJackson2HttpMessageConverter added         And the error will be gone

[json] Spring MVC - HttpMediaTypeNotAcceptableException

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