judgment vacated, and proceeding dismissed in its entirety on the merits. Appeal by petitioners from the order dismissed, without costs or disbursements, in light of the aforesaid determination. It is alleged that pursuant to various directives issued by the New York City Board of Education, petitioners, teachers licensed in various subject areas, obtained appointments as teachers of classes for emotionally handicapped children. Conditional certificates of continued eligibility were issued to petitioners and upon completion of prerequisites established by the board of education such certificates would become permanent. The certificate of continued eligibility (CCE), as represented by the board of education, was equivalent to a license in the area. Consequently, when respondents determined that licenses would be issued only upon successful completion of a competitive examination, and that petitioners would be required to participate in the examination, the instant proceeding was commenced. Subsequent to the commencement of this proceeding and after rendition by Special Term of its decision, but before the date of the judgment appealed from, section 2569-e of the Education Law was enacted, effective June 30,1980. By its provisions a teacher holding a CCE is required to pass a special examination for a license within five years, and upon passing the examination, is given preference for permanent appointment as against appointments from any other qualified list of eligihles. It is axiomatic that these provisions control, unless the petitioners have acquired a vested right to the license (see
Matter of De Cordova v Bennett, 32 AD2d 959 ). Petitioners asserted at Special Term and assert on appeal that pursuant to the directives of the hoard of education they are validly licensed as teachers of the emotionally handicapped. Alternatively, it is argued that in view of petitioners’ reliance upon the board of education directives, respondents should be es-topped from denying the validity of the CCE’s as licenses. Respondents, however, contend that pursuant to sections 2569 and 2590-j of the Education Law, and section 6 of article V of the New York State Constitution, appointments and licensing of teachers must be made by competitive examination, and that, notwithstanding any representation of the respondent board of education to the contrary, the mandate of the statutes and Constitution must be upheld; hence, petitioners cannot be validly licensed absent competitive examination. Moreover, respondents argue that as petitioners’ licenses had not vested, section 2569-e of the Education Law, which mandates that holders of CCE’s successfully complete a competitive examination as a prerequisite to licensure, although enacted subsequent to the decision at Special Term, controls on appeal. Finally, respondents submit that the doctrine of estoppel, generally inapplicable against governmental bodies, may not be asserted in the case at bar. We first address the question of whether petitioners’ right to licensure had vested. Pursuant to section 6 of article V of the New York State Constitution, all appointments and promotions within the civil service of the State and all divisions thereof “shall be made according to merit and fitness to be ascertained, as far as practicable, by examination which, as far as practicable, shall be competitive”. Section 2569 (subd 1, par a) and section 2590-j (subd 3, par [a], cl [1]; par [b], cl [1]) of the Education Law, which place teaching positions in the open competitive category and require the respondent board of examiners to prepare and administer objective examinations and eligibility lists for licensing and appointment of teachers, reflect the legislative determination that in the field of education, appointment of teachers by competitive examination is practicable. Respondents were at best entitled to make temporary appointments pending the promulgation of eligibility lists compiled from the results of the appropriate examination (see
Matter of Council of Supervisory Assns. of Public Schools of N. Y. City v Board of Educ., 23 NY2d 458 ) and notwithstanding representations of the board of education to the contrary,