From Java Object to JSON String using javax.json

Question

Is it possible to create a JSON string from List<MyClass> using Java EE 7's javax.json library without iterating over the List<MyClass>?

This is what I do now and the performance is unacceptable with 2000 iteration. Any suggestion?

List<MyClass> items = MyDB.getAllItems();
JsonObjectBuilder builder = Json.createObjectBuilder();
builder.add("success", true);
JsonArrayBuilder childrenArrayBuilder = Json.createArrayBuilder();

for (MyClass item : items) {
     childrenArrayBuilder.add(
        Json.createObjectBuilder()
            .add("id", getTreeNodeId(item) + "-" + (idSplit[1]))
            .add("nodeStatus", b)
            .add("text", item.getName())
            .add("leaf", false));
}

Answer 1

You are creating a lot of objects in your loops which is probably not necessary. With GSON and as far as MyClass contains only what you need I will do something like:

List<MyClass> list = MyDB.getAllItems();
GSON gson = new GSON();
String myString = gson.toJson(list);