N.J. Stat. Ann. § 18A:17-3

Every public school janitor of a school district shall, unless he is appointed for a fixed term, hold his office, position or employment under tenure during good behavior and efficiency and shall not be dismissed or suspended or reduced in compensation, except as the result of the reduction of the number of janitors in the district made in accordance with the provisions of this title or except for neglect, misbehavior or other offense and only in the manner prescribed by subarticle B of article 2 of chapter 6 of this title.