This book constitutes the refereed proceedings of the 7th European Software Engineering Conference, ESEC'99, held jointly with the 7th ACM SIGSOFT Symposium on the Foundations of Software Engineering in Toulouse, France in September 1999. The 29 revised full papers presented together with two invited contributions were carefully reviewed and selected from a total of 141 submissions. The papers are organized in topical sections on software components, software process, specification, program analysis, testing and debugging, Java, architectures and models, reuse, and verification and checking.