How to POST a JSON object to a JAX-RS service

Question

I am using the Jersey implementation of JAX-RS  I would like to POST a JSON object to this service but I am getting an error code 415 Unsupported Media Type  What am I missing   Here s my code    Path   orders    Consumes MediaType APPLICATION JSON   Produces MediaType APPLICATION JSON  public class OrderResource        private static Map lt Integer  Order gt  orders   new HashMap lt Integer  Order gt           POST     public void createOrder Order order             orders put order id  order               GET      Path    id        public Order getOrder  PathParam  id   int id            Order order   orders get id           if  order    null                order   new Order 0   Buy    Unknown   0                     return order            Here s the Order object   public class Order       public int id      public String side      public String symbol      public int quantity              A GET request like this works perfectly and returns an order in JSON format   GET http   localhost 8080 jaxrs-oms rest orders 123 HTTP 1 1   However a POST request like this returns a 415   POST http   localhost 8080 jaxrs-oms rest orders HTTP 1 1         id    123        symbol    AAPL        side    Buy        quantity    1000

User · Answer

Jersey makes the process very easy  my service class worked well with JSON  all I had to do is to add the dependencies in the pom xml   Path   customer   public class CustomerService        private static Map lt Integer  Customer gt  customers   new HashMap lt Integer  Customer gt           POST      Path  save        Consumes MediaType APPLICATION JSON       Produces MediaType APPLICATION JSON      public SaveResult save Customer c             customers put c getId    c            SaveResult sr   new SaveResult            sr sucess   true          return sr              GET      Produces MediaType APPLICATION JSON       Path   id        public Customer getCustomer  PathParam  id   int id            Customer c   customers get id           if  c    null                c   new Customer                c setId id   3               c setName  unknow     id                     return c            And in the pom xml   lt dependency gt       lt groupId gt org glassfish jersey containers lt  groupId gt       lt artifactId gt jersey-container-servlet lt  artifactId gt       lt version gt 2 7 lt  version gt   lt  dependency gt   lt dependency gt       lt groupId gt org glassfish jersey media lt  groupId gt       lt artifactId gt jersey-media-json-jackson lt  artifactId gt       lt version gt 2 7 lt  version gt   lt  dependency gt   lt dependency gt       lt groupId gt org glassfish jersey media lt  groupId gt       lt artifactId gt jersey-media-moxy lt  artifactId gt       lt version gt 2 7 lt  version gt   lt  dependency gt

User · Answer

The answer was surprisingly simple  I had to add a Content-Type header in the POST request with a value of application json  Without this header Jersey did not know what to do with the request body  in spite of the  Consumes MediaType APPLICATION JSON  annotation

User · Answer

I faced the same 415 http error when sending objects  serialized into JSON  via PUT PUSH requests to my JAX-rs services  in other words my server was not able to de-serialize the objects from JSON  In my case  the server was able to serialize successfully the same objects in JSON when sending them into its responses   As mentioned in the other responses I have correctly set the Accept and Content-Type headers to application json  but it doesn t suffice   Solution  I simply forgot a default constructor with no parameters for my DTO objects  Yes this is the same reasoning behind  Entity objects  you need a constructor with no parameters for the ORM to instantiate objects and populate the fields later   Adding the constructor with no parameters to my DTO objects solved my issue  Here follows an example that resembles my code   Wrong   XmlRootElement  XmlAccessorType XmlAccessType FIELD  public class NumberDTO       public NumberDTO Number number            this number   number             private Number number       public Number getNumber             return number             public void setNumber Number string            this number   string            Right   XmlRootElement  XmlAccessorType XmlAccessType FIELD  public class NumberDTO        public NumberDTO                public NumberDTO Number number            this number   number             private Number number       public Number getNumber             return number             public void setNumber Number string            this number   string            I lost hours  I hope this ll save yours  -

[json] How to POST a JSON object to a JAX-RS service

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