ASE 2017

2017 32nd IEEE/ACM International Conference on Automated Software Engineering (ASE 2017), October 30 – November 3, 2017, Urbana-Champaign, IL, USA

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Tool Demonstrations
Defaultification Refactoring: A Tool for Automatically Converting Java Methods to Default
Raffi Khatchadourian and Hidehiko Masuhara
(City University of New York, USA; Tokyo Institute of Technology, Japan)
Supplementary Material
Abstract: Enabling interfaces to declare (instance) method implementations, Java 8 default methods can be used as a substitute for the ubiquitous skeletal implementation software design pattern. Performing this transformation on legacy software manually, though, may be non-trivial. The refactoring requires analyzing complex type hierarchies, resolving multiple implementation inheritance issues, reconciling differences between class and interface methods, and analyzing tie-breakers (dispatch precedence) with overriding class methods. All of this is necessary to preserve type-correctness and confirm semantics preservation. We demonstrate an automated refactoring tool called textsc{Migrate Skeletal Implementation to Interface} for transforming legacy Java code to use the new default construct. The tool, implemented as an Eclipse plug-in, is driven by an efficient, fully-automated, type constraint-based refactoring approach. It features an extensive rule set covering various corner-cases where default methods cannot be used. The resulting code is semantically equivalent to the original, more succinct, easier to comprehend, less complex, and exhibits increased modularity. A demonstration can be found at


Time stamp: 2019-06-19T15:46:33+02:00