JsonArrayBuilder gives blank output

Question

I've got multiple console logs. The "AB" log in the ArrayBuilder itself gives me the output below which is the correct output. But the log in the input for the ArrayBuilder gives me a blank [ ]. Why is the JsonArrayBuilder not returning the correct output?

"AB[{"ingredientnaam":"Banaan","calorieen":89,"vet":0.9,"verzadigd_vet":0.3,"eiwit":1.2,"koolhydraten":20.4,"vezels":1.9,"zout":0.0}]"

Input for the ArrayBuilder

JsonArray ingredientArray = buildJsonIngredientArray(service.getToday(gebruikersnaam, datum));
System.out.println(ingredientArray.toString());
return ingredientArray.toString();

My JsonArrayBuilder

private JsonArray buildJsonIngredientArray(List<Dagboek> list) {
    JsonArrayBuilder jsonArrayBuilder = Json.createArrayBuilder();

    for (Dagboek d : list) {
        Ingredient c = d.getIngredient();
        JsonObjectBuilder job = Json.createObjectBuilder();
        job.add("ingredientnaam", c.getIngredientnaam());
        job.add("calorieen", c.getCalorieen());
        job.add("vet", c.getVet());
        job.add("verzadigd_vet", c.getVerzadigd_vet());
        job.add("eiwit", c.getEiwit());
        job.add("koolhydraten", c.getKoolhydraten());
        job.add("vezels", c.getVezels());
        job.add("zout", c.getZout());

        jsonArrayBuilder.add(job);
    }
    System.out.println("AB" + jsonArrayBuilder.build());
    return jsonArrayBuilder.build();
}

This seems unlikely, but it might be clearing the internal array after you call build. Try storing the return value for build used here: System.out.println("AB" + jsonArrayBuilder.build());, and returning it. (full disclosure, no idea if this will work) — Neil Locketz
– Neil Locketz, Commented Jun 13, 2017 at 15:46
@NeilLocketz What the hell, I don't understand why but it fixed it haha. Thanks a bunch! — Some Name
– Some Name, Commented Jun 13, 2017 at 15:56

Neil Locketz · Accepted Answer · 2017-06-13 15:58:43Z

1

It might be clearing the internal array after you call build. I couldn't find anything about this in the documentation though.

Try storing the return value for build used here:

System.out.println("AB" + jsonArrayBuilder.build());

and returning it.

answered Jun 13, 2017 at 15:58

Neil Locketz

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