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PMD (software)
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<h2 id="features">Features</h2> <p>PMD is able to detect flaws or possible flaws in source code, like: </p> <ul><li><i>Bugs</i>—Empty try/catch/finally/switch blocks.</li> <li><i>Dead code</i>—Unused <a href="/facts/Local_variable/q8sIjyhx">local variables</a>, <a href="/facts/Parameter/zFvVFMv9">parameters</a> and <a href="/facts/Private_method/zvzkSAtE">private methods</a>.</li> <li>Empty if/while statements.</li> <li><i>Overcomplicated expressions</i>—Unnecessary if statements, for loops that could be while loops.</li> <li><i>Suboptimal code</i>—Wasteful String/StringBuffer usage.</li> <li>Classes with high <a href="/facts/Cyclomatic_complexity/m3FYrLNR">Cyclomatic Complexity</a> measurements.</li> <li><i>Duplicate code</i>—Copied/pasted code can mean copied/pasted bugs, and decreases maintainability.</li></ul> <h2 id="license">License</h2> <p>PMD is released under a BSDish license while parts of it are under <a href="/facts/Apache_License/5AeIjas8">Apache License</a> 2.0 and the <a href="/facts/GNU_Lesser_General_Public_License/AXwkz9x3">LGPL</a>.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> </p> <h2 id="copypaste-detector-cpd">Copy/Paste Detector (CPD)</h2> <p>The Copy/Paste Detector (CPD) is an add-on to PMD that uses the <a href="/facts/Rabin%E2%80%93Karp_string_search_algorithm/Wf7f0F53">Rabin–Karp string search algorithm</a> to find <a href="/facts/Duplicate_code/adzaD7R2">duplicated code</a>. Unlike PMD, CPD works with a broader range of languages including Java, <a href="/facts/JavaServer_Pages/LAr4ALkb">JavaServer Pages</a> (JSP), <a href="/facts/C_(programming_language)/Ky2No763">C</a>, <a href="/facts/C%2B%2B/Et0F2qn9">C++</a>, <a href="/facts/Fortran/m1KqjcMU">Fortran</a>, <a href="/facts/PHP/vU6YRJX0">PHP</a>, and <a href="/facts/C_Sharp_(programming_language)/UC2gxeyb">C#</a> code. </p> <h2 id="plugins">Plugins</h2> <p>PMD has <a href="/facts/Plug-in_(computing)/351Du3Wu">plugins</a> for <a href="/facts/JDeveloper/mehgK5Dj">JDeveloper</a>, <a href="/facts/Eclipse_(computing)/YoqHVjas">Eclipse</a>, <a href="/facts/JEdit/PBeuB4wm">jEdit</a>, <a href="/facts/JBuilder/YmJUQnF3">JBuilder</a>, Omnicore's CodeGuide, <a href="/facts/NetBeans/9kqvIVFG">NetBeans</a>/<a href="/facts/Sun_Studio_(software)/Wlj0GcQ4">Sun Studio</a>, <a href="/facts/IntelliJ_IDEA/h689XrQz">IntelliJ IDEA</a>, <a href="/facts/TextPad/262pGJew">TextPad</a>, <a href="/facts/Apache_Maven/xHkdXzqa">Maven</a>, <a href="/facts/Ant_(software)/CT6ABXEx">Ant</a>, <a href="/facts/Gradle/eqsXvwI7">Gradle</a>, Gel, JCreator, <a href="/facts/Hudson_(software)/34ndk8B3">Hudson</a>, <a href="/facts/Jenkins_(software)/HlJCkJ0V">Jenkins</a>, <a href="/facts/SonarQube/QkgUdseX">SonarQube</a>, <a href="/facts/Visual_Studio_Code/YsBDgKlK">Visual Studio Code</a> and <a href="/facts/Emacs/BvGxuAxQ">Emacs</a>.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> There is also a <a href="/facts/Command-line_interface/R9JpGmXQ">CLI</a> version. </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/List_of_tools_for_static_code_analysis/E9bcvnrD">List of tools for static code analysis</a></li> <li><a href="/facts/SonarQube/QkgUdseX">SonarQube</a></li></ul> <h2 id="further-reading">Further reading</h2> <ul><li>Rutar, Almazan, Foster (2004), <a href="http://dl.acm.org/citation.cfm?id=1033833">"A Comparison of Bug Finding Tools for Java"</a>. <i>ISSRE '04 Proceedings of the 15th International Symposium on Software Reliability Engineering</i>, IEEE, doi:10.1109/ISSRE.2004.1</li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="https://pmd.github.io">Official website</a> </li> <li><a href="https://github.com/pmd">PMD</a> on <a href="/facts/GitHub/n1hNCsc3">GitHub</a></li> <li><a href="https://sourceforge.net/projects/pmd/">PMD</a> on <a href="/facts/SourceForge/lxYAgUAX">SourceForge</a></li> <li><a href="http://pmd.sourceforge.net/cpd.html">CPD</a> on <a href="/facts/SourceForge/lxYAgUAX">SourceForge.net</a>.</li> <li><a href="http://pmdapplied.com/">Book: "PMD Applied"</a> Written by the lead developer, Tom Copeland (<a href="https://web.archive.org/web/20051206035255/http://tomcopeland.blogs.com/">[1]</a>).</li> <li><a href="http://www.javavillage.in/PMD-CPD-in-maven.php">PMD and CPD in Maven</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"What does 'PMD' mean?". pmd-code.org. Retrieved 31 March 2023. <a href="https://docs.pmd-code.org/latest/pmd_projectdocs_trivia_meaning.html" target="_blank">https://docs.pmd-code.org/latest/pmd_projectdocs_trivia_meaning.html</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"Destroy annoying bugs part 4: the end is near". freesoftwaremagazine.com. <a href="http://freesoftwaremagazine.com/articles/destroy_annoying_bugs_part_4/" target="_blank">http://freesoftwaremagazine.com/articles/destroy_annoying_bugs_part_4/</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"License". GitHub. 18 January 2015. Retrieved 13 August 2015. <a href="https://github.com/pmd/pmd/blob/master/LICENSE" target="_blank">https://github.com/pmd/pmd/blob/master/LICENSE</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"Tools / Integrations". pmd-code.org. Retrieved 31 March 2023. <a href="https://docs.pmd-code.org/latest/pmd_userdocs_tools.html" target="_blank">https://docs.pmd-code.org/latest/pmd_userdocs_tools.html</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> </ol>