JDeodorant

JDeodorant is an Eclipse plug-in that detects design problems in Java software, known as code smells, and recommends appropriate refactorings to resolve them.

For the moment, the tool supports five code smells, namely Feature Envy, Type/State Checking, Long Method, God Class and Duplicated Code.

• Feature Envy problems can be resolved by appropriate Move Method refactorings.
• Type Checking problems can be resolved by appropriate Replace Conditional with Polymorphism refactorings.
• State Checking problems can be resolved by appropriate Replace Type code with State/Strategy refactorings.
• Long Method problems can be resolved by appropriate Extract Method refactorings.
• God Class problems can be resolved by appropriate Extract Class refactorings.
• Duplicated Code problems can be resolved by appropriate Extract Clone refactorings.

JDeodorant is the outcome of research conducted in the Software Refactoring Lab at the Department of Computer Science and Software Engineering, Concordia University, Canada and the Software Engineering Group at the Department of Applied Informatics, University of Macedonia, Thessaloniki, Greece.

Installation & Configuration

Please follow the steps described in this guide.

JDeodorant can be easily installed in your Eclipse IDE using the Eclipse Marketplace Client.

To enable the analysis of large Java projects, edit the eclipse.ini file inside the Eclipse installation folder and increase the value for the Xmx option (maximum size of the memory allocation pool).

-vmargs
-Xms128m
-Xmx4096m
-XX:PermSize=128m

Tutorials

Duplicated Code

• JDeodorant: Refactoring of the Clones - Teaser Trailer
• JDeodorant: Clone Refactoring (ICSE 2016 Tool demo)

Code Smell Visualization

• JDeodorant: Code Smell Visualization Demo

God Class

• JDeodorant: Extract Class Refactoring

Research

If you are interested to learn how exactly JDeodorant works, please have a look at the following papers:

Duplicated Code

• Nikolaos Tsantalis, Davood Mazinanian, and Shahriar Rostami, "Clone Refactoring with Lambda Expressions," 39th International Conference on Software Engineering (ICSE'2017), Buenos Aires, Argentina, May 20-28, 2017.
• Nikolaos Tsantalis, Davood Mazinanian, and Giri Panamoottil Krishnan, "Assessing the Refactorability of Software Clones," IEEE Transactions on Software Engineering, vol. 41, no. 11, pp. 1055-1090, November 2015.
• Giri Panamoottil Krishnan, and Nikolaos Tsantalis, "Unification and Refactoring of Clones," pp. 104-113, IEEE Conference on Software Maintenance, Reengineering and Reverse Engineering (CSMR-WCRE'2014), 2014 Software Evolution Week, Antwerp, Belgium, February 3-7, 2014.
• Giri Panamoottil Krishnan, and Nikolaos Tsantalis, "Refactoring Clones: An Optimization Problem," pp. 360-363, 29th IEEE International Conference on Software Maintenance (ICSM'2013), ERA Track, Eindhoven, The Netherlands, September 22-28, 2013.
• Davood Mazinanian, Nikolaos Tsantalis, Raphael Stein, and Zackary Valenta, "JDeodorant: Clone Refactoring," 38th International Conference on Software Engineering (ICSE'2016), Formal Tool Demonstration Session, Austin, Texas, USA, May 14-22, 2016.

Long Method

• Nikolaos Tsantalis, and Alexander Chatzigeorgiou, "Identification of Extract Method Refactoring Opportunities for the Decomposition of Methods," Journal of Systems and Software, vol. 84, no. 10, pp. 1757–1782, October 2011.
• Nikolaos Tsantalis, and Alexander Chatzigeorgiou, "Identification of Extract Method Refactoring Opportunities," pp. 119-128, 13th European Conference on Software Maintenance and Reengineering (CSMR'2009), Kaiserslautern, Germany, March 24-27, 2009.

God Class

• Marios Fokaefs, Nikolaos Tsantalis, Eleni Stroulia, and Alexander Chatzigeorgiou, "Identification and Application of Extract Class Refactorings in Object-Oriented Systems," Journal of Systems and Software, vol. 85, no. 10, pp. 2241–2260, October 2012.
• Marios Fokaefs, Nikolaos Tsantalis, Alexander Chatzigeorgiou, and Jörg Sander, "Decomposing Object-Oriented Class Modules Using an Agglomerative Clustering Technique," pp. 93-101, 25th IEEE International Conference on Software Maintenance (ICSM'2009), Edmonton, Alberta, Canada, September 20-26, 2009.
• Marios Fokaefs, Nikolaos Tsantalis, Eleni Stroulia, and Alexander Chatzigeorgiou, "JDeodorant: Identification and Application of Extract Class Refactorings," pp. 1037-1039, 33rd International Conference on Software Engineering (ICSE'2011), Tool Demonstration Session, Waikiki, Honolulu, Hawaii, USA, May 21-28, 2011.

Type/State Checking

• Nikolaos Tsantalis, and Alexander Chatzigeorgiou, "Identification of Refactoring Opportunities Introducing Polymorphism," Journal of Systems and Software, vol. 83, no. 3, pp. 391-404, March 2010.
• Nikolaos Tsantalis, Theodoros Chaikalis, and Alexander Chatzigeorgiou, "JDeodorant: Identification and Removal of Type-Checking Bad Smells," pp. 329-331, 12th European Conference on Software Maintenance and Reengineering (CSMR'2008), Tool Demonstration Session, Athens, Greece, April 1-4, 2008.

Feature Envy

• Nikolaos Tsantalis, and Alexander Chatzigeorgiou, "Identification of Move Method Refactoring Opportunities," IEEE Transactions on Software Engineering, vol. 35, no. 3, pp. 347-367, May/June 2009.
• Marios Fokaefs, Nikolaos Tsantalis, and Alexander Chatzigeorgiou, "JDeodorant: Identification and Removal of Feature Envy Bad Smells," pp. 519-520, 23rd IEEE International Conference on Software Maintenance (ICSM'2007), Tool Demonstration Session, Paris, France, October 2-5, 2007.

If you are using JDeodorant in your research, please cite at least one of the aforementioned papers.