Certification Pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002; provided by the Chief Executive Officer based on such officer's knowledge and belief. I, Gifford R. Zimmerman, Chief Administrative Officer of Nuveen New Jersey Dividend Advantage Municipal Fund 2 (the "Fund"), certify that, to the best of my knowledge and belief: 1. The Form N-CSR of the Fund for the period ended June 30, 2003 (the "Report") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and 2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Fund. Date: September 9, 2003 ----------------------- /s/ Gifford R. Zimmerman --------------------- Chief Administrative Officer (chief executive officer) Certification Pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002; provided by the Chief Financial Officer based on such officer's knowledge and belief. I, Stephen D. Foy, Vice President and Controller of Nuveen New Jersey Dividend Advantage Municipal Fund 2 (the "Fund"), certify that, to the best of my knowledge and belief: 1. The Form N-CSR of the Fund for the period ended June 30, 2003 (the "Report") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and 2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Fund. Date: September 9, 2003 ----------------------- /s/ Stephen D. Foy --------------------- Vice President, Controller (Chief Financial Officer)