This book constitutes the refereed proceedings of the 18th European Conference on Object-Oriented Programming, ECOOP 2004, held in Oslo, Norway in June 2004. The 25 revised full papers presented together with the abstracts of 2 invited talks were carefully reviewed and selected from a total of 132 submissions. The papers are organized in topical sections on encapsulation, program analysis, software engineering, aspects, middleware, types, verification, and systems.

This year, for the eighth time, the European Conference on Object-Oriented Programming (ECOOP) series, in cooperation with Springer, is glad to o?er the object-oriented research community the ECOOP 2004 Workshop Reader, a compendium of workshop reports pertaining to the ECOOP 2004 conference, held in Oslo from June 15 to 19, 2004. ECOOP 2004 hosted 19 high-quality workshops covering a large spectrum of hot research topics. These workshops were chosen through a tight peer review process following a speci?c call for proposals ending on November 30, 2003. We are very grateful to the members of the Workshop Selection Committee for their careful reviews and hard work to put together the excellent workshop program. We also want to thank all submitters, accepted or not, to whom the workshop program equally owes its quality. This selection process was then followed by a selection of workshop participants, done by each team of organizers based on an open call for position papers. This participant selection process ensured that we gathered the most active researchers in each workshop research area, and therefore a fruitful working meeting. Following the tradition of the ECOOP Workshop Reader, we strove for hi- quality, value-adding and open-ended workshop reports. The result, as you can judgefromthefollowingpages,isathought-provokingsnapshotofthecurrent- searchinobject-orientation,fullofpointersforfurtherexplorationofthecovered topics. We want to thank our workshop organizers who, despite the additional burden, did a great job in putting together these reports.

The21stEuropeanConferenceonObject-OrientedProgramming,ECOOP2007, was held in Berlin, Germany, on July 30 to August 3, 2007. ECOOP is the most importantand inspiring forumin Europeandbeyond for researchers,practiti- ers, and students working in that smorgasbord of topics and approaches known as object orientation. This topic area was explored and challenged by excellent invited speakers—two of which were the winners of this year’s Dahl-Nygaard award—in the carefully refereed and selected technical papers, on posters, via demonstrations, and in tutorials. Each of the many workshops complemented this with a very interactive and dynamic treatment of more speci?c topics. - nally, panels allowed for loud and lively disagreement. Yet, it is one of ECOOP’s specialqualities that this plethora ofactivities add upto a coherentandexciting whole, rather than deteriorating into chaos. The Program Committee received 161 submissions this year. Only 135 of them were carried through the full review process, because of a number of - tractions and a number of submissions of abstracts that were never followed by a full paper. However, the remaining papers were of very high quality and we accepted25 of them for publication. Helping very goodpapers to be published is more useful than having an impressively low acceptance rate. The papers were selected according to four groups of criteria, whose priority depended on the paper: relevance; originality and signi?cance; precisionand correctness;and p- sentation and clarity. Each paper had three, four, or ?ve reviews, depending on how controversial it was.

The 19th Annual Meeting of the European Conference on Object-Oriented Programming—ECOOP 2005—took place during the last week of July in Glasgow, Scotland, UK. This volume includes the refereed technical papers p- sented at the conference, and two invited papers. It is traditional to preface a volume of proceedings such as this with a note that emphasizes the importance of the conference in its respective ?eld. Although such self-evaluations should always be taken with a large grain of salt, ECOOP is undisputedly the pre- inent conference on object-orientation outside of the United States. In its turn, object-orientationis today’s principaltechnology not only for programming,but also for design, analysisand speci?cation of softwaresystems. As a consequence, ECOOP has expanded far beyond its roots in programming to encompass all of these areas of research—whichis why ECOOP has remained such an interesting conference. But ECOOP is more than an interesting conference. It is the nucleus of a technical and academic community, a community whose goals are the creation and dissemination of new knowledge. Chance meetings at ECOOP have helped to spawn collaborations that span the boundaries of our many subdisciplines, bring together researchers and practitioners, cross cultures, and reach from one side of the world to the other. The ubiquity of fast electronic communication has made maintaining these collaborations easier than we would have believed possible only a dozen years ago. But the role of conferences like ECOOP in establishing collaborations has not diminished.

It is a pleasure to present the proceedings of the 22nd European Conference on Object-Oriented Programming (ECOOP 2008) held in Paphos, Cyprus. The conference continues to serve a broad object-oriented community with a tech- cal program spanning theory and practice and a healthy mix of industrial and academic participants. This year a strong workshop and tutorial program c- plementedthemaintechnicaltrack.Wehad13workshopsand8tutorials,aswell as the co-located Dynamic Language Symposium (DLS). Finally, the program was rounded out with a keynote by Rachid Guerraoui and a banquet speech by James Noble. As in previous years, two Dahl-Nygaard awards were selected by AITO, and for the ?rst time, the ECOOP Program Committee gave a best paper award. Theproceedingsinclude27papersselectedfrom138submissions.Thepapers werereviewed in a single-blind process with three to ?ve reviews per paper. P- liminaryversionsofthereviewsweremadeavailabletotheauthorsaweekbefore the PC meeting to allow for short (500 words or less) author responses. The - sponses were discussed at the PC meeting and were instrumental in reaching decisions. The PC discussions followed Oscar Nierstrasz’Champion pattern. PC papers had ?ve reviews and were held at a higher standard.

Annotation This book constitutes the refereed proceedings of the 24th European Conference on Object-Oriented Programming, ECOOP 2010, held in Maribor, Slovenia, in June 2010. The 24 revised full papers, presented together with one extended abstract were carefully reviewed and selected from a total of 108 submissions. The papers cover topics such as programming environments and tools, theoretical foundations of programming languages, formal methods, concurrency models in Java, empirical methods, type systems, language design and implementation, concurrency abstractions and experiences.

This book constitutes the refereed proceedings of the 26th European Conference on Object-Oriented Programming, ECOOP 2012, held in Beijing, China, in June 2012. The 27 revised full papers presented together with two keynote lectures were carefully reviewed and selected from a total of 140 submissions. The papers are organized in topical sections on extensibility, language evaluation, ownership and initialisation, language features, special-purpose analyses, javascript, hardcore theory, modularity, updates and interference, general-purpose analyses.

This book constitutes the refereed proceedings of the 20th European Conference on Object-Oriented Programming, ECOOP 2006, held in Nantes, France in July 2006. 20 revised full papers, together with 3 keynote papers were carefully reviewed and selected. The papers are organized in topical sections on program query and persistence, ownership and concurrency, languages, type theory, types for object-oriented languages, tools, and modularity. 5 more papers celebrate the 20th anniversary of ECOOP.

This book constitutes the refereed proceedings of the 25th European Conference on Object-Oriented Programming, ECOOP 2011, held in Lancaster, UK, in July 2011. The 26 revised full papers, presented together with three keynote lectures were carefully reviewed and selected from a total of 100 submissions. The papers cover topics such as empirical studies, mining, understanding, recommending, modularity, modelling and refactoring, aliasing and ownership; as well as memory optimizations.

This book constitutes the proceedings of the 27th European Conference on Object-Oriented Programming, ECOOP 2013, held in Montpellier, France, in July 2013. The 29 papers presented in this volume were carefully reviewed and selected from 116 submissions. They are organized in topical sections on aspects, components, and modularity; types; language design; concurrency, parallelism, and distribution; analysis and verification; modelling and refactoring; testing, profiling, and empirical studies; and implementation.