Spring MVC JSON 406 Not Acceptable

Question

I m trying to generate a simple JSON response working  Right now I get 406 Not Acceptable error  Tomcat says  The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request  accept  headers   even though my Accept headers are  Accept text html application xhtml xml application xml q 0 9     q 0 8   In tomcat lib I have all Tomcat jars  Spring jars and jackson-all-1 9 0 jar  I m using Spring 3 2 2 with Tomcat 7    I m aware that this issue has been discussed many times  but none of solutions is working for me   web xml   lt web-app id  WebApp ID  version  2 4       xmlns  http   java sun com xml ns j2ee       xmlns xsi  http   www w3 org 2001 XMLSchema-instance       xsi schemaLocation  http   java sun com xml ns j2ee      http   java sun com xml ns j2ee web-app 2 4 xsd  gt      lt display-name gt Spring Web MVC Application lt  display-name gt      lt servlet gt       lt servlet-name gt dispatcher lt  servlet-name gt           lt servlet-class gt                    org springframework web servlet DispatcherServlet          lt  servlet-class gt           lt load-on-startup gt 1 lt  load-on-startup gt     lt  servlet gt      lt servlet-mapping gt       lt servlet-name gt dispatcher lt  servlet-name gt           lt url-pattern gt   htm lt  url-pattern gt     lt  servlet-mapping gt    lt  web-app gt    dispatcher-servlet xml   lt beans xmlns  http   www springframework org schema beans      xmlns context  http   www springframework org schema context      xmlns mvc  http   www springframework org schema mvc       xmlns xsi  http   www w3 org 2001 XMLSchema-instance      xsi schemaLocation  http   www springframework org schema beans      http   www springframework org schema beans spring-beans-2 5 xsd      http   www springframework org schema context          http   www springframework org schema context spring-context-3 0 xsd         http   www springframework org schema mvc         http   www springframework org schema mvc spring-mvc-3 0 xsd  gt        lt bean id  viewResolver          class  org springframework web servlet view InternalResourceViewResolver   gt           lt property name  prefix  gt               lt value gt  WEB-INF pages  lt  value gt           lt  property gt           lt property name  suffix  gt               lt value gt  jsp lt  value gt           lt  property gt       lt  bean gt    lt context component-scan base-package  com smiechmateusz controller    gt    lt context annotation-config   gt        lt mvc annotation-driven   gt    lt  beans gt    HelloWorldController java  package com smiechmateusz controller   import javax servlet http HttpServletRequest  import javax servlet http HttpServletResponse   import org springframework stereotype Controller  import org springframework web bind annotation RequestMapping  import org springframework web bind annotation RequestMethod  import org springframework web bind annotation ResponseBody  import org springframework web servlet ModelAndView  import org springframework web servlet mvc AbstractController   import com smiechmateusz dao Foo    Controller  RequestMapping      public class HelloWorldController extends AbstractController        Override     protected ModelAndView handleRequestInternal HttpServletRequest request          HttpServletResponse response  throws Exception            ModelAndView model   new ModelAndView  HelloWorldPage            return model              RequestMapping value  foobar htm   method   RequestMethod GET      public  ResponseBody Foo getShopInJSON             Foo f   new Foo            f setX 1           f setY 2           f setDescription  desc            return f            Foo java  package com smiechmateusz dao   import java io Serializable   import javax persistence Column  import javax persistence Entity  import javax persistence GeneratedValue  import javax persistence Id  import javax persistence Table    Entity  Table name  foobaz   public class Foo implements Serializable       private int x  y      String description      int id        Column name    x       public int getX             return x            public void setX int x            this x   x             Column name    y       public int getY             return y            public void setY int y            this y   y             Column name    description       public String getDescription             return description            public void setDescription String description            this description   description              Id  GeneratedValue      Column name    id       public int getId             return id            public void setId int id            this id   id            I ve already tried adding    lt bean id  jsonConverter  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  jsonConverter   gt             lt  list gt       lt  property gt   lt  bean gt    to my dispatcher-servlet xml or changing jakcson-all to jackson-asl and jackson-core-asl but output was the same

User · Answer

My class was annotated with JsonSerialize  and the include parameter was set to JsonSerialize Inclusion NON DEFAULT  This caused Jackson to determine the default values for each bean property  I had a bean property that returned an int  The problem in my case was that the bean getter made a call to a method which has an inferred return type  i e   a generic method   For some odd reason this code compiled  it shouldn t have compiled because you cannot use an int for an inferred return type  I changed the  int  to an  Integer  for that bean property and I no longer got a 406  The odd thing is  the code now fails to compile if I change the Integer back to an int

User · Answer

this is because of the object is not acceptable at jsp    use his   add this dependency or any other send converted json string to jsp     for example add this in pom   lt dependency gt           lt groupId gt com google code gson lt  groupId gt           lt artifactId gt gson lt  artifactId gt           lt version gt 2 6 2 lt  version gt       lt  dependency gt    and use code like that    RequestMapping value  foobar htm   method   RequestMethod GET      public  ResponseBody String getShopInJSON             Foo f   new Foo            f setX 1           f setY 2           f setDescription  desc            return new Gson   toJson f     converted object into json string        return converted json string

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There is another case where this status will be returned  if the Jackson mapper cannot figure out how to serialize your bean  For example  if you have two accessor methods for the same boolean property  isFoo   and getFoo     removed getFoo   and put isFoo    it worked for me

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See the problem is with the extension  Depending upon the extension  spring could figure out the content-type  If your url ends with  com then it sends text html as the content-type header  If you want to change this behavior of Spring  please use the below code    Configuration  Import HibernateConfig class   EnableWebMvc     EnableAsync       EnableAspectJAutoProxy  ComponentScan basePackages    com azim web service      basePackageClasses     WebSecurityConfig class    excludeFilters      ComponentScan Filter Configuration class     public class WebConfig extends WebMvcConfigurerAdapter         Override     public void configureContentNegotiation ContentNegotiationConfigurer configurer            configurer favorPathExtension false  favorParameter true  parameterName  mediaType   ignoreAcceptHeader true  useJaf false                   defaultContentType MediaType APPLICATION JSON  mediaType  xml   MediaType APPLICATION XML  mediaType  json   MediaType APPLICATION JSON               Bean name    validator       public Validator validator             return new LocalValidatorFactoryBean              Here  we are setting favorPathExtension to false and Default Content-type to Application json  Note  HibernateConfig class contains all the beans

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One more way you can get this error is to create a class with no public members  406 unacceptable is a pretty useless error message in this scenario

User · Answer

My RequestMapping value was ending with  html which should be something different   I tried changing it to  json and it worked for me

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Use below dependency in your pom   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 5 3 lt  version gt   lt  dependency gt

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You have to register the annotation binding for Jackson in your spring-mvc-config xml  for example     lt  -- activates annotation driven binding -- gt   lt mvc annotation-driven ignoreDefaultModelOnRedirect  true  validator  validator  gt       lt mvc message-converters gt           lt bean class  org springframework http converter ResourceHttpMessageConverter   gt           lt bean class  org springframework http converter xml Jaxb2RootElementHttpMessageConverter   gt           lt bean class  org springframework http converter json MappingJacksonHttpMessageConverter   gt       lt  mvc message-converters gt   lt  mvc annotation-driven gt    Then in your controller you can use     RequestMapping value     your url   method   RequestMethod GET  produces    application json    ResponseBody

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I have got the similar issue and resolved by using below code   public class ProductList        private List lt Product gt  productList    new ArrayList lt Product gt           JsonProperty  data        JsonTypeInfo use JsonTypeInfo Id NAME  include JsonTypeInfo As WRAPPER OBJECT      public List lt Product gt  getProductList             return productList        public void setProductList List lt Product gt  productList            this productList   productList         I am setting ProductList object in ResponseEntity object and returning from controller

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None of the other answers helped me   I read dozens of Stackoverflow answers about 406 Not Acceptable  HttpMediaTypeNotAcceptableException  multipart file  ResponseBody  setting Accept headers  produces  consumes etc   We had Spring 4 2 4 with SpringBoot and Jackson configured in build gradle   compile  com fasterxml jackson core jackson-core 2 6 7  compile  com fasterxml jackson core jackson-databind 2 6 7    All routes worked fine in our other controllers and we could use GET  POST  PUT  and DELETE  Then I started to add multipart file upload capability and created a new controller  The GET routes work fine but our POST and DELETE didn t  No matter how I tried different solutions from here at SO I just kept getting 406 Not Acceptable   Then finally I stumbled across this SO answer  Spring throwing HttpMediaTypeNotAcceptableException  Could not find acceptable representation due to dot in url path  Read Raniz s answer and all the comments   It all boiled down to our  RequestMapping values    RequestMapping value     audio  fileName       method   RequestMethod POST  consumes  multipart     public AudioFileDto insertAudio  PathVariable String fileName   RequestParam  audiofile   MultipartFile audiofile         return audioService insert fileName  audiofile       RequestMapping value     audio  fileName       method   RequestMethod DELETE  public Boolean deleteAudio  PathVariable String fileName         return audioService remove fileName       The  fileName     part in a  RequestMapping value caused the 406 Not Acceptable in our case   Here s the code I added from Raniz s answer    Configuration public class ContentNegotiationConfig extends WebMvcConfigurerAdapter        Override     void configureContentNegotiation final ContentNegotiationConfigurer configurer               Turn off suffix-based content negotiation         configurer favorPathExtension false             EDIT August 29th 2016   We got into trouble using configurer favorPathExtension false   static SVG images ceased to load  After analysis  we found that Spring started to send SVG files back to UI with content-type  application octet-stream  instead of  image svg xml   We solved this by sending fileName as a query parameter  like    RequestMapping value     audio   method   RequestMethod DELETE  public Boolean deleteAudio  RequestParam String fileName         return audioService remove fileName       We also removed the configurer favorPathExtension false   Another way could be to encode fileName in the path but we chose the query parameter method to avoid further side effects

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If you re using Maven and the latest Jackson code then you can remove all the Jackson-specific configuration from your spring configuration XML files  you ll still need an annotation-driven tag  lt mvc annotation-driven  gt   and simply add some Jackson dependencies to your pom xml file  See below for an example of the dependencies  This worked for me and I m using    Apache Maven 3 0 4  r1232337  2012-01-17 01 44 56-0700  org springframework version 3 1 2 RELEASE spring-security version 3 1 0 RELEASE       lt dependencies gt           lt dependency gt           lt groupId gt com fasterxml jackson core lt  groupId gt           lt artifactId gt jackson-core lt  artifactId gt           lt version gt 2 2 3 lt  version 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 version gt 2 2 3 lt  version gt       lt  dependency gt       lt dependency gt           lt groupId gt com fasterxml jackson core lt  groupId gt           lt artifactId gt jackson-annotations lt  artifactId gt           lt version gt 2 2 3 lt  version gt       lt  dependency gt           lt  dependencies gt

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I suppose  that the problem was in usage of   htm extension in RequestMapping  foobar htm   Try to change it to footer json or something else   The link to the correct answer  https   stackoverflow com a 21236862 537246  P S   It is in manner of Spring to do something by default  concerning  that developers know whole API of Spring from A to Z  And then just  406 not acceptable  without any details  and Tomcat s logs are empty

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Accept text html application xhtml xml application xml q 0 9   q 0 8   That should be the problem  JSON is served as application json  If you set the Accept header accordingly  you should get the proper response   There are browser plugins that let you set headers  I like  Poster  for Firefox best

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As it is the top answer for this error  I am adding the case for XML here   There is also a possibility that the object returned hasn t correctly defined XML structure  That was the case for me   public  ResponseBody DataObject getData    Was throwing the same error despite correct headers  The errors stopped when I added  XmlRootElement to the header of the object    XmlRootElement public class DataObject        XmlElement name    field   nillable   true      protected String field

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Today I too gone through the same issue  In my case  in web xml I have       lt servlet-mapping gt           lt servlet-name gt spring lt  servlet-name gt           lt url-pattern gt   html lt  url-pattern gt       lt  servlet-mapping gt    my url is having  html extension   Ex     getUsers html   But I am returning JSON data in controller    html extension will by default set accept type as html     So I changed to the following   web xml    lt servlet-mapping gt       lt servlet-name gt spring lt  servlet-name gt       lt url-pattern gt   html lt  url-pattern gt       lt url-pattern gt   json lt  url-pattern gt   lt  servlet-mapping gt    URL       getUsers json  Everything is working fine now   Hope it helps

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Maybe all fields of your POJO need Getter and Setter   I fixed it according to this issue   reference Spring MVC - HttpMediaTypeNotAcceptableException  And 406 is not a useful message to fix the bug  You should debug into the codes and see what the Exception is on earth

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Try adding   RequestMapping method   RequestMethod GET headers     Accept text xml  application json      on getShopInJSON     It worked for me

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With Spring 4 you only add  EnableWebMvc  for example    Controller  EnableWebMvc  RequestMapping value     articles action   headers  Accept        produces  application json   public class ArticlesController

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I had the same issue  in my case the following was missing from my xxx-servlet xml config file   lt mvc annotation-driven  gt    As soon I added this it it worked

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I couldn t see it as an answer here so I thought I would mention that I recieved this error using spring 4 2 when I accidentally removed the getter setter for the class I was expecting to be returned as Json

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It looks like your are trying to produce recieve json output  I see two problems with your approach  1  You didn t specify the application json in your Accept header 2  You need to specify produces  application json  in your  RequestMapping

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