A source code plagiarism detection engine Plaggie is presented. It is a stand-alone Java application that can be used to check Java programming exercises. Plaggie's functionality is similar with previously published JPlag web service but unlike JPlag, Plaggie must be installed locally and its source code is open. Apparently, Plaggie is the only open-source plagiarism detection engine for Java exercises.
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Ahtiainen et al. (2006) studied this question.
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