How to convert JSON array to java object

Question

This is the json i'm sending via POST request

{
  "PIds" : [ "MOB123", "ELEC456"]
}

This is my class that receives the JSON,

@POST
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
@Path("/GetProductsInfo")
public List<ProductDetails> getProductsInfo(ProductIds productIds) {

    System.out.println(productIds + "   ");

    DBCursor<ProductDetails> dbCursor = collection.find(DBQuery.in("pid", productIds.getPIds()));

    List<ProductDetails> products = new ArrayList<>();
    while (dbCursor.hasNext()) {
        ProductDetails product = dbCursor.next();
        products.add(product);
    }
    return products;
}

Im converting the JSON array into the 'ProductIds' object, this is my POJO class

public class ProductIds
{
    @JsonProperty("PIds")
    private List<String> pIds;

    public List<String> getPIds()
    {
        return pIds;
    }

    public void setPIds(List<String> Pids)
    {
        this.pIds = Pids;
    }

    @Override
    public String toString()
    {
        return "ClassPojo [PIds = "+ pIds +"]";
    }
}

The problem for me here is that the JSON is not getting populated into the java object 'productIds' is NULL, I dont know why. Im new to Jackson can someone help me out. Thank you

Which REST library do you use? If Jersey what is your Jersey config? Have you registered Jackson feature? BTW, you may use List directly as argument for getProductsInfo. — Dmytro, Jun 25 '15 at 12:16
You could take advantage of the `GET` verb and remove the word from your path: `GET /ProductsInfo`. Then `POST` could be reused on the same URI to create/update. — Sam Berry, Jun 25 '15 at 23:14

score 1 · Accepted Answer · answered Jun 25 '15 at 11:43

1

Did you try to get the ID's out using .getJSONArray()? Uses the org.json library.

JSONObject obj = new JSONObject(jsoninput);

JSONArray jsonArray = obj.getJSONArray("PIds");

answered Jun 25 '15 at 11:43

Camelaria

284
6
23

score 0 · Answer 2 · edited May 23 '17 at 12:22

0

Are you using JAXB? Jersey? fasterxml.jackson? I'm getting the impression you are using several at the same time

RestClass:

@POST
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
@Path("/GetProductsInfo")
public List<ProductDetails> getProductsInfo(@RequestBody ProductIds productIds) {
   // etc
}

For JAXB:

@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class ProductIds {
    @XmlElement("PIds")
    private List<String> pIds;

    public List<String> getPIds() {
        return pIds;
    }

    public void setPIds(List<String> Pids) {
        this.pIds = Pids;
    }

    @Override
    public String toString() {
        return "ClassPojo [PIds = " + pIds + "]";
    }
}

Otherwise take a look at:

Convert a JSON string to object in Java ME?

How to convert the following json string to java object?

edited May 23 '17 at 12:22

Community

1
1

answered Jun 25 '15 at 11:18

Danielson

2,605
2
28
51

I'm using Jersey @Danielson – Ferooz Khan Jun 25 '15 at 11:19
I'm uncertain but I think the above also works for Jersey – Danielson Jun 25 '15 at 11:21
The @JsonProperty is for Jackson – Danielson Jun 25 '15 at 11:21
The GET,POST annotation are for Jersey and in POJO the @JsonProperty is Jackson. Im using both jersey and jackson for my application – Ferooz Khan Jun 25 '15 at 11:23
@RequestBody ProductIds productIds – Danielson Jun 25 '15 at 11:27
There is no annotation as @RequestBody – Ferooz Khan Jun 25 '15 at 11:29
Still get nothing if you change your argument type to String? – Danielson Jun 25 '15 at 11:32
I get the JSON as String argument. It is not getting converted to java object, that is my problem – Ferooz Khan Jun 25 '15 at 11:36
check this answer... http://stackoverflow.com/a/31022354/928952 It help to translate JSON string to Java Class – Danielson Jun 25 '15 at 11:37

How to convert JSON array to java object

2 Answers2