Problems adding Jsonobject to Jsonarray

Question

import javax.json.Json;
import javax.json.JsonArray;
import javax.json.JsonObject;
import javax.json.JsonValue;

// código

   JsonObject object = Json.createObjectBuilder().build();
   JsonArray array = Json.createArrayBuilder().build();

   JsonArray tweets = getTweets();

   for (JsonValue tweet : tweets) {
       object = (JsonObject) tweet;
       array.add(object);
   }
   return array;

I take this exception:

java.lang.UnsupportedOperationException

I also took a look at java documentation but it didn’t help...

Answer 1

According to the documentation, the JsonArray represents a json array immutable. That is, once built, it cannot be modified.

Instead of working with the JsonArray directly, use the JsonArrayBuilder:

JsonArrayBuilder builder = Json.createArrayBuilder();
JsonArray tweets = getTweets();

for (JsonValue tweet : tweets) {
    builder.add(tweet);
}
return builder.build();