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Cobertura is a free Java tool that calculates the percentage of code accessed by tests. It can be used to identify which parts of your Java program are lacking test coverage. It is based on jcoverage.
The Maven Author Plugin generates an HTML report showing informations gathered from other Maven reports (Checkstyle, FindBugs, PMD, Lint4j, JavaNCSS, JCoverage, Cobertura, Emma, Clover, Tasks List, etc.) and categorized by author(s) of source files.