Exhibit 99.1

                           PERSISTENCE SOFTWARE, INC.

                            CERTIFICATION PRUSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Persistence Software, Inc. (the
"Company") on Form 10-Q/A for the quarter ended March 31, 2003, as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), I,
Christopher T. Keene, Chief Executive Officer of the Company, certify, pursuant
to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, that:

         (1)      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 result of
                  operations of the Company.


/s/ CHRISTOPHER T. KEENE
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Christopher T. Keene
Chief Executive Officer
August 12, 2003