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

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)!

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<Integer, Customer> customers = new HashMap<Integer, Customer>();    @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

<dependency>    <groupId>org.glassfish.jersey.containers</groupId>    <artifactId>jersey-container-servlet</artifactId>    <version>2.7</version></dependency><dependency>    <groupId>org.glassfish.jersey.media</groupId>    <artifactId>jersey-media-json-jackson</artifactId>    <version>2.7</version></dependency><dependency>    <groupId>org.glassfish.jersey.media</groupId>    <artifactId>jersey-media-moxy</artifactId>    <version>2.7</version></dependency>

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 ;-)