How to use Gson convert Java object to Json String (serialize POJO) with root value included

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If you are using Gson library (google-gsonA Java library to convert JSON to Java objects and vice-versa) and you want to serialize POJO with root value included like the following illustrated code for serializing XML.

class Person implements Serializable {
    private String firstname;
    private String lastname;
    public Person() {

It’s very simple, here is an example to do it with Gson:

    Gson gson = new Gson();
    JsonElement je = gson.toJsonTree(new Person());
    JsonObject jo = new JsonObject();

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