N.J. Stat. § 40A:10-38.7
A joint insurance fund shall cause a copy of a bond resolution adopted by it to be filed for public inspection in its office and in the offices of the clerks of the local units which are members of the fund and shall thereupon cause to be published in a newspaper published or circulating in the jurisdiction of the member local units a notice stating the fact and date of the adoption, the places where the bond resolution has been filed for public inspection, and the date of the first publication. The notice also shall state that any action or proceeding of any kind in any court questioning the validity or proper authorization of a bond provided for by the bond resolution, or the validity of any covenant, agreement or contract provided for by the bond resolution shall be commenced within 20 days after the first publication of the notice. If after the notice is published, no action or proceeding questioning the validity or proper authorization of a bond provided for by the bond resolution referred to in the notice, or the validity of a covenant, agreement or contract provided for by the bond resolution is commenced within 20 days after the first publication of the notice, then all member local units of the fund, their residents, and all other persons shall be forever barred from commencing an action or proceeding in a court or from pleading a defense to an action or proceeding, questioning the validity of the creation and establishment of the joint insurance fund, or the validity or proper authorization of the bonds, or the validity of a covenant, agreement or contract, and the fund shall be conclusively deemed to have been validly created and established and to be authorized to transact business and exercise powers as a joint insurance fund under this act, and the bond, covenant, agreement or contracts shall be conclusively deemed to be a valid and binding obligation in accordance with its terms and tenor.
N.J.S. § 40A:10-38.7