• Java Jackson JSON Library
• Gson
• Payload
• json path

• JsonObjectBuilder (Java(TM) EE 7 Specification APIs)
• JSON Processing in Java EE 7 | Baeldung
• JSON Support in Jakarta EE | The Eclipse Foundation

JsonObject json = Json.createObjectBuilder()
  .add("name", "Falco")
    .add("age", BigDecimal.valueOf(3))
  .add("bitable", Boolean.FALSE).build();
 
String result = json.toString();
System.out.println(result);