This book constitutes the refereed proceedings of the 13th European Conference on Object-Oriented Programming, ECOOP'99, held in Lisbon, Portugal in June 1999.The 20 revised full papers presented were carefully reviewed and selected from a total of 183 submissions on the basis of three to five reviews. Also included are four invited papers. The book is structured in topical sections on mixins, debugging and garbage collection, type checking, virtual and multi-methods, adaptive programming, classification and inheritance, and distributed objects.

Table of Contents:
Invited Paper 1.- A Trace Model for Pointers and Objects.- Mixins.- Synthesizing Objects.- A Core Calculus of Classes and Mixins.- Propagating Class and Method Combination.- Debugging and Garbage Collection.- A study of the Allocation Behavior of the SPECjvm98 Java Benchmarks.- Visualizing Reference Patterns for Solving Memory Leaks in Java.- Dynamic Query-Based Debugging.- Type Checking.- Foundations for Virtual Types.- Unifying Genericity.- An Object-Oriented Effects System.- Invited Paper 2.- Providing Persistent Objects in Distributed Systems.- Virtual and Multi-methods.- Inlining of Virtual Methods.- Modular Statically Typed Multimethods.- Multi-Method Dispatch Using Multiple Row Displacement.- Adaptive Programming.- Internal Iteration Externalized.- Type-Safe Delegation for Run-Time Component Adaptation.- Towards Automatic Specialization of Java Programs.- Classification and Inheritance.- Wide Classes.- An Approach to Classify Semi-Structured Objects.- Invited Paper 3.- Object-Oriented Programming on the Network.- Distributed Objects.- Providing Fine-Grained Access Control for Java Programs.- Formal Specification and Prototyping of CORBA Systems.- A Process Algebraic Specication of the New Asynchronous CORBA Messaging Service?.- Invited Paper 4.- Object-Oriented Programming: Regaining the Excitement.