Abstract

Software repositories are analyzed to extract useful information on software characteristics. One of them is external quality. A technique used to increase software quality is automatic static analysis, by means of bug finding tools. These tools promise to speed up the verification of source code; anyway, there are still many problems, especially the high number of false positives, that hinder their large adoption in software development industry. We studied the capability of a popular bug-finding tool, FindBugs, for defect prediction purposes, analyzing the issues revealed on a repository of university Java projects. Particularly, we focused on the percentage of them that indicates actual defects with respect to their category and priority, and we ranked them. We found that a very limited set of issues have high precision and therefore have a positive impact on code external quality.

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