Spring Rest POST Json RequestBody Content type not supported

Question

When I try to post new object with post method  RequestBody could not recognize contentType  Spring is already configured and POST could work with others objects  but not this specific one   org springframework web HttpMediaTypeNotSupportedException  Content type  application json charset UTF-8  not supported   If I try the same request just changing requestbody object  It works

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try to add jackson dependency       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 9 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 9 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 9 3 lt  version gt           lt exclusions gt               lt exclusion gt                   lt artifactId gt jackson-annotations lt  artifactId gt                   lt groupId gt com fasterxml jackson core lt  groupId gt               lt  exclusion gt           lt  exclusions gt       lt  dependency gt

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I had the same issue when I had two setters one with Enum and one String  I had to use  JsonSetter annotation which tells Jackson what setter method to use during serialization  This solved my issue

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In my case I had two Constructors in the bean and I had the same error  I have just deleted one of them  and now the issue is fixed

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I had the same issue when I used this as a foreign key    JsonBackReference  ManyToOne cascade    CascadeType PERSIST  CascadeType DETACH  fetch   FetchType EAGER   JoinColumn name    user id   private User user    Then I removed  JsonBackReference annotation  After that above issue was fixed

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For the case where there are 2 getters for the same property  the deserializer fails Refer Link

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Really  after spending 4 hours and insane debugging I found this very strange code at com fasterxml jackson databind deser DeserializerCache  if  deser    null        try           deser    createAndCacheValueDeserializer ctxt  factory  type         catch  Exception e            return false            Ya  the problem was double setter

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specify  JsonProperty in entity class constructor like this                           JsonCreator  public Location  JsonProperty  sl no   Long sl no              JsonProperty  location  String location             JsonProperty  location type   String            location type  JsonProperty  store sl no  Long store sl no      this sl no   sl no    this location   location    this location type   location type    this store sl no   store sl no

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I had the same issue  Root cause was using custom deserializer without default constructor

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If you use lombok  you can get that error if you screw up naming of  JsonDeserialize  for example    Value  Builder toBuilder   true   JsonDeserialize builder   SomeClass SomeOtherClassBuilder class  public class SomeClass               public static class SomeOtherClassBuilder                         It should be    Value  Builder toBuilder   true   JsonDeserialize builder   SomeClass SomeClassBuilder class  public class SomeClass               public static class SomeClassBuilder                         It is very easy to do that when you do refactoring of class name and forget about Builder    and then you have many hours of joy while you search for reason of error  while having as help only extremely unhelpful exception message

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Be aware also if you have declared getters and setters for attributes of the parameter which are not sent in the POST  event if they are not declared in the constructor   for example    RestController public class TestController         RequestMapping value     test   method   RequestMethod POST      public String test  RequestBody BeanTest beanTest            return  Hello     beanTest getName                public static class BeanTest            private Long id          private String name           public BeanTest                        public BeanTest Long id                this id   id                     public Long getId                 return id                     public void setId Long id                this id   id                     public String getName                 return name                     public void setName String name                this name   name                      A post request with the next structure    id   1   would not work  you must delete name get and set

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I had this problem when using java 9  modules  I had to open the module in order for the com fasterxml jackson databind to access the objects with reflection  Alternatively you could only open the package where the models are located if you have one

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So I had a similar issue where I had a bean with some overloaded constructor  This bean also had Optional properties   To resolve that I just removed the overloaded constructors and it worked   example   public class Bean   Optional lt String gt  string  Optional lt AnotherClass gt  object   public Bean Optional lt String gt  str  Optional lt AnotherClass gt  obj   string   str  object   obj        The problem was below constructor  public Bean Optional lt String gt  str   string   str  object   Optional empty

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It looks an old thread  but in case someone  still struggles  I have solved as Thibaut said it    Avoid having two setter POJO class  I had two-setters for a specific property    The first one was in the regular setter and another one in under constructor after I removed the one in the constructor it worked

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I met the same problem which i solved by deserializing myself the posted value     RequestMapping value     arduinos commands  idArduino    method   RequestMethod POST  produces   MediaType APPLICATION JSON VALUE  consumes   MediaType APPLICATION JSON VALUE   ResponseBody public String sendCommandesJson  PathVariable  idArduino   String idArduino  HttpServletRequest request  throws IOException          getting the posted value     String body   CharStreams toString request getReader         List lt ArduinoCommand gt  commandes   new ObjectMapper   readValue body  new TypeReference lt List lt ArduinoCommand gt  gt                with theses gradle dependencies      compile  org springframework boot spring-boot-starter-web     compile  com google guava guava 16 0 1

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I found solution  It s was because I had 2 setter with same name but different type  My class had id property int that I replaced with Integer when    Hibernitify my object  But apparently  I forgot to remove setters and I had           param id               the id to set     public void setId int id        this id   id             param id               the id to set     public void setId Integer id        this id   id     When I removed this setter  rest resquest work very well  Intead to throw unmarshalling error or reflect class error  Exception HttpMediaTypeNotSupportedException seams really strange here  I hope this stackoverflow could be help someone else  SIDE NOTE You can check your Spring server console for the following error message   Failed to evaluate Jackson deserialization for type  simple type  class your package ClassName   com fasterxml jackson databind JsonMappingException  Conflicting setter definitions for property  quot propertyname quot   Then you can be sure you are dealing with the issue mentioned above

[java] Spring Rest POST Json RequestBody Content type not supported

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