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This book constitutes the proceedings of the 28th European Conference on Object-Oriented Programming, ECOOP 2014, held in Uppsala, Sweden, in July/August 2014. The 27 papers presented in this volume were carefully reviewed and selected from 101 submissions. They are organized in topical sections named: analysis; design; concurrency; types; implementation; refactoring; JavaScript, PHP and frameworks; and parallelism.

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State-Sensitive Points-to Analysis for the Dynamic Behavior of JavaScript.- Self-inferencing Reflection Resolution for Java.- Constructing Call Graphs of Scala Programs.- Finding Reference-Counting Errors in Python/C Programs with Affine Analysis.- Safely Composable Type-Specific Languages.- Graceful Dialects.- Structuring Documentation to Support State Search: A Laboratory Experiment about Protocol Programming.- Reusable Concurrent Data Types.- TaDA: A Logic for Time and Data Abstraction.- Infrastructure-Free Logging and Replay of Concurrent Execution on Multiple Cores.- Understanding TypeScript.- Sound and Complete Subtyping between Coinductive Types for Object-Oriented Languages.- Spores: A Type-Based Foundation for Closures in the Age of Concurrency and Distribution.- Rely-Guarantee Protocols.- Stream Processing with a Spreadsheet.- Implicit Staging of EDSL Expressions: A Bridge between Shallow and Deep Embedding.- Babelsberg/JS: A Browser-Based Implementation of an Object Constraint Language.- Automated Multi-Language Artifact Binding and Rename Refactoring between Java and DSLs Used by Java Frameworks.- Retargetting Legacy Browser Extensions to Modern Extension Frameworks.- Capture-Avoiding and Hygienic Program Transformations.- Converting Parallel Code from Low-Level Abstractions to Higher-Level Abstractions.- Portable and Efficient Run-Time Monitoring of JavaScript Applications Using Virtual Machine Layering.- An Executable Formal Semantics of PHP.- Identifying Mandatory Code for Framework Use via a Single Application Trace.- Cooperative Scheduling of Parallel Tasks with General Synchronization Patterns.- MiCA: A Compositional Architecture for Gossip Protocols.- Semantics of Resilient) X10.

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