...which is exactly how value classes and (after this JEP) records work. You are not allowed to call any instance methods before the call to `super()` (which ha

...which is exactly how value classes and (after this JEP) records work. You are not allowed to call any instance methods before the call to `super()` (which happens implicitly at the end of the constructor for value classes and for records, unless you explicitly call it), and you are not allowed to call `super()` without first setting a value for all of your fields.