Toward an effective utilization of static code analysis tools, this paper investigates which violation is familiar with more programmers and widely appears in source files (having a high coverage), and which violation is really related to bugfixes (having a high importance), for six popular OSS projects. The results show: 1) the familiar violations tend to differ among projects, and only 25 violations are common to all surveyed projects; 2) the trends of their importance vary from project to project.
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