The New Jersey Constitution of 1947 (Annotated) Art. VII, § I, ¶ 2

2. Appointments and promotions in the civil service of the State, and of such political subdivisions as may be provided by law, shall be made according to merit and fitness to be ascertained, as far as practicable, by examination, which, as far as practicable, shall be competitive; except that preference in appointments by reason of active service in any branch of the military or naval forces of the United States in time of war may be provided by law.