N.J. Const. art. V, § 1, ¶ 13

The Governor may fill any vacancy occurring in any office during a recess of the Legislature, appointment to which may be made by the Governor with the advice and consent of the Senate, or by the Legislature in joint meeting. An ad interim appointment so made shall expire at the end of the next regular session of the Senate, unless a successor shall be sooner appointed and qualify; and after the end of the session no ad interim appointment to the same office shall be made unless the Governor shall have submitted to the Senate a nomination to the office during the session and the Senate shall have adjourned without confirming or rejecting it. No person nominated for any office shall be eligible for an ad interim appointment to such office if the nomination shall have failed of confirmation by the Senate.