1 EXHIBIT 23.1 CONSENT OF DELOITTE & TOUCHE LLP INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in Registration Statement No. 333-82543 of Persistence Software, Inc. on Form S-8 of our reports dated January 28, 2000, appearing in this Annual Report on Form 10-K of Persistence Software, Inc. for the year ended December 31, 1999. DELOITTE & TOUCHE LLP /s/ DELOITTE & TOUCHE LLP - ------------------------- San Jose, California March 29, 2000