No. The job of a constructor is to establish the class’s invariants for the new instance, or else fail with an exception. This bug in the String class fails to do so.

> The job of a constructor is to establish the class’s invariants for the new instance, or else fail with an exception.

Could you refer such statement in Java specification?

Invariants and all methods -- including constructors -- enforcing them is OOP 101. I would be surprised if they felt the need to make such a callout in the language specification.