CODEWITHSUNDEEP
javajsongoogle-app-enginejacksongoogle-cloud-endpoints
Pokuri
Pokuri

Reputation: 3082

cloud endpoint not respecting Jackson annotations

I have a class Organization with few date fields as follows.

public class Organization {

    private String _id;

    private String name;

    @JsonDeserialize(using=JsonDateDeserializer.class)
    @JsonSerialize(using=JsonDateSerializer.class)
    private Date createdTime;

// getters and setters

}

To handle the date in simple way on client side I convert date to long and send it to client using these JsonSerializer as follows

public class JsonDateSerializer extends JsonSerializer<Date>{

    @Override
    public void serialize(Date date, JsonGenerator gen, SerializerProvider provider) throws IOException, JsonProcessingException {
        gen.writeNumber(date.getTime());
    }

}

I have a endpoint which will execute get organization and insert the results in response map like this.

@ApiMethod(name="organization.get", path="organizations/{organizationId}", httpMethod=HttpMethod.GET)
public Map<String, Object> organizationDetails(@Named("organizationId") String organizationId){
    Organization org = DB.getOrganization("123");
    Map<String, Object> response = new HashMap<String, Object>();
    response.put("status", HttpServletResponse.SC_OK);
    response.put("success", true);
    response.put("entity", org);
    return response;
}

But the end resultant JSON I see on client side is 

{
  "status" : 200,
  "entity" : [ {
    "_id" : "966a03b3-8e46-41ee-b330-6533409b2b4a",
    "name" : "POKURI",    
    "createdTime" : "2015-05-16T15:02:31.499+05:30"
  } ],
  "success" : true
}

Here the date coming in some format instead of long. If I convert the same using Jackson ObjectMapper without using cloud endpoints I am getting response in expected way. Why cloud endpoints not respecting Jackson annotations? Is there a way to configure that?

Note: Even I observed that long is coming as string on client side if you use cloud endpoints. I am using appengine SDK 1.9.19

Upvotes: 0

Views: 273

Answers (1)

saiyr
saiyr

Reputation: 2595

You aren't supposed to use Jackson annotations with Endpoints (and if you do, you have to use the repackaged version, not your own). You can do what you want with @ApiResourceProperty or @ApiTransformer, depending on how you want to do it. See the annotation documentation here.

Regarding long, it is serialized as a string due to floating point imprecision--it's not possible to represent all values of a long accurately using a double, which is what JavaScript and JSON.parse will store a numeric in, so it is always transmitted as a string. Any of our client libraries for Endpoints automatically convert them to the correct data type.

Upvotes: 1

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