Serialize Pojos to JSON using new standard javax.json
See JSR-367, Java API for JSON Binding (JSON-B), a headline feature in Java™ EE 8.
Document: Json Binding 1.0 Users Guide
// Create Jsonb and serializeJsonb jsonb = JsonbBuilder.create();String result = jsonb.toJson(dog);// Deserialize backdog = jsonb.fromJson("{name:\"Falco\", age:4, bitable:false}", Dog.class);
Maybe it's because this question is almost 5 years old (I didn't check which java release has these classes) but there is a standard way with javax.json.* classes:
JsonObject json = Json.createObjectBuilder() .add("key", "value") .build();try(JsonWriter writer = Json.createWriter(outputStream)) { writer.write(json);}