abstract = "Defects4J is a collection of reproducible bugs,
extracted from real-world Java software systems,
together with a supporting infrastructure for using
these bugs. Defects4J has been widely used to evaluate
software engineering research, including research on
automated test generation, program repair, and fault
localization. Defects4J has recently grown
substantially, both in number of software systems and
number of bugs. This report proposes that Defects4J can
serve as a benchmark for Search-Based Software
Engineering (SBSE) research as well as a catalyst for
new innovations. Specifically, it outlines the current
Defects4J dataset and infrastructure, and details how
it can serve as a challenge case to support SBSE
research and to expand Defects4J itself.",