Developer Teams on Bug Resolution: An Empirical Study on Mozilla Firefox and Eclipse JDT Projects

With the adoption of Open Source Software (OSS)systems increasing in practical usage, it is important toinvestigate bug resolution process of OSS projects. This paperconducted an empirical study on developer teams in bugresolution in Mozilla Firefox and Eclipse JDT projects. Withthe extracted bug numbers of source code changes from VCS(Versions Control System) and the extracted frequently cooccurringdevelopers from open bug repository, we analyzeddeveloper teams' focuses on bugs with respect to products,components, and packages. Through the empirical study, wediscovered that developer teams do naturally exist in bothMozilla Firefox and Eclipse JDT projects. More than half of allbugs are collaboratively fixed by developer teams. Eachdeveloper team has relatively stable focus on bugs with respectto particular products, components and source code packages.We also found that the discovered teams on bug resolution aredifferent from those published on OSS websites.