N.J. Stat. § 2A:62-23
When a grant or conveyance in fee of riparian lands or lands under water, or both, has been or shall be made by the state, the riparian commission, the board of commerce and navigation, the division of navigation, in the department of conservation or the division of planning and development in the department of conservation and economic development to any person, who, or whose lessee or grantee under an unexpired lease or an estate for years not terminated is in possession of the lands, or any part thereof, and the state denies the validity of the grant or conveyance of the fee and desires to contest it, the attorney general may maintain an action in the superior court on behalf of the state to determine and settle the title to the affected lands and to clear up all doubts concerning the same.
N.J.S. § 2A:62-23