{¶ 1} We affirm the judgment of the court of appeals dismissing the complaint of appellant, Rajpal Bandarapalli, for a writ of prohibition to prevent appellee, Cuyahoga County Court of Common Pleas Judge Eileen T. Gallagher, from proceeding in the underlying criminal case against him. Bandarapalli claims that his indictment is defective. Bandarapalli has adequate remedies in the ordinary course of law by motion to dismiss the indictment and, in the event he is convicted based on the alleged defective indictment, by appeal. See, e.g., State ex rel. Parker v. Cuyahoga Cty. Court of Common Pleas (1980), 61 Ohio St.2d 351, 352, 15 O.O.3d 435, 402 N.E.2d 508; State ex rel. Johnson v. Talikka (1994), 71 *315 Ohio St.3d 109, 111, 642 N.E.2d 353; Pishok v. Kelly, 122 Ohio St.3d 292, 2009-Ohio-3452, 910 N.E.2d 1033, ¶ 1. Bandarapalli’s reliance on State v. Cimpritz (1953), 158 Ohio St. 490, 49 O.O. 418, 110 N.E.2d 416, paragraph six of the syllabus, to contend that he may raise a claim that his indictment is defective in a collateral proceeding like prohibition is misplaced because we later clarified Cimpritz by holding that a defective-indictment claim could be raised only by direct challenge in the ordinary course of law rather than in a collateral attack by extraordinary writ. See State v. Wozniak (1961), 172 Ohio St. 517, 522-523, 18 O.O.2d 58, 178 N.E.2d 800, and Midling v. Perrini (1968), 14 Ohio St.2d 106, 43 O.O.2d 171, 236 N.E.2d 557, syllabus.

{¶ 2} Bandarapalli’s remaining prohibition claim — that Judge Gallagher cannot preside over his criminal trial because she ruled on the state’s motion under Crim.R. 16 to withhold witnesses’ names and addresses and to prevent contact between Bandarapalli and the witnesses — is reviewable on appeal for harmless error. See State v. Gillard (1988), 40 Ohio St.3d 226, 229-230, 533 N.E.2d 272, reversed on other grounds by State v. McGuire (1997), 80 Ohio St.3d 390, 686 N.E.2d 1112.

{¶ 3} Based on the foregoing, Bandarapalli’s claims allege, at best, errors in the exercise of the court’s jurisdiction rather than a lack of subject-matter jurisdiction. See State ex rel. Mosier v. Fornof, 126 Ohio St.3d 47, 2010-Ohio-2516, 930 N.E.2d 305, ¶ 7. Therefore, the court of appeals properly dismissed his complaint for extraordinary relief in prohibition.

Judgment affirmed.