N.J. Ct. R. 4:6-2

Every defense, legal or equitable, in law or fact, to a claim for relief in any complaint, counterclaim, cross-claim, or third-party complaint shall be asserted in the answer thereto, except that the following defenses, unless otherwise provided by R. 4:6- 3, may at the option of the pleader be made by motion, with briefs: (a) lack of jurisdiction over the subject matter, (b) lack of jurisdiction over the person, (c) insufficiency of process, (d) insufficiency of service of process, (e) failure to state a claim upon which relief can be granted, (f) failure to join a party without whom the action cannot proceed, as provided by R. 4:28-1. If a motion is made raising any of these defenses, it shall be made before pleading if a further pleading is to be made. No defense or objection is waived by being joined with one or more other defenses in an answer or motion. Special appearances are superseded. A motion to dismiss based on defense (e), and any opposition thereto, shall be filed and served in accordance with the time frames set forth in R. 4:46-1. If, on a motion to dismiss based on defense (e), matters outside the pleading are presented to and not excluded by the court, the motion shall be treated as one for summary judgment and disposed of as provided by R. 4:46, and all parties shall be given reasonable notice of the court’s intention to treat the motion as one for summary judgment and a reasonable opportunity to present all material pertinent to such a motion.